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Green synthesis of silver nanoparticles using durian rind extract and optical characteristics of surface plasmon resonance-based optical sensor for the detection of hydrogen peroxide

  • Fueangfakan Chutrakulwong and Kheamrutai Thamaphat EMAIL logo
Published/Copyright: August 9, 2023
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Abstract

Silver nanoparticles (AgNPs) have been efficaciously synthesized from AgNO3 via an easy and green method, also called green synthesis, using Mon Thong durian (Durio zibethinus L.) rind extract. The inner shell of durian rind extract was used as an intermediary for the synthesis of AgNPs because the absorption spectra of the AgNP colloid extracted from the inner shell had a higher absorption than that of the outer shell. Additionally, we have found more fructose and glucose – which act as a reducing agent – and protein and carbohydrates – which act as the stabilizer – in a higher amount in the inner shell than the extract from the outer shell. The synthesized AgNPs were mainly spherical in shape and exhibited a relatively narrow size distribution with an average particle diameter of 10.2 ± 0.2 nm. In the reduction of hydrogen peroxide (H2O2), these nanoparticles demonstrate catalytic activity. The degradation of AgNPs, including the catalytic decomposition of H2O2, causes a considerable change in the absorbance strength of the surface plasmon resonance band depending on the H2O2 concentration. Over a broad concentration range of 10−1–10−6 mol·L−1 H2O2, a good sensitivity and a linear response are achieved. This sensor’s quantification limit is found to be 0.9 µmol·L−1 H2O2. Therefore, this optical sensor for the detection of H2O2 can be potentially applied in the determination of color indicators in medical or clinical diagnosis, biochemical analysis, and environmental applications.

1 Introduction

Considering that hydrogen peroxide (H2O2) is a byproduct of processes mediated by several oxidase enzymes, determining H2O2 in trace amounts is a crucial and essential task. It is crucial in a variety of industries, including those related to food, medicine, clinical laboratories, and environmental analysis [1,2]. The majority of the techniques for measuring H2O2 that have been developed until now are based on enzymes and include spectrofluorometry [3,4,5], spectrophotometry [6,7,8], and electrochemistry [9,10,11]. Although enzyme sensitivity and selectivity are exceptional, immobilizing and stabilizing enzymes are challenging operations. It was found that sensors had poor repeatability and instability when exposed to enzymatic H2O2.

The construction of innovative devices and applications, including chemical sensors and biosensors, is made possible by the distinctive optical, magnetic, catalytic, and mechanical capabilities of nanoscale materials [12,13,14,15]. According to recent publications [16,17,18,19], several attempts have been made to monitor the concentration of H2O2 electrochemically by applying nanomaterials (using no enzymes). Due to their advantages such as high surface response activity, high catalytic efficiency, high surface-to-volume ratio, strong adsorption ability, stability, and ease of electron transfer, nanomaterial-altered electrodes are an excellent option for detecting H2O2. The sensors made of nanomaterials have quicker reaction times and lower detection thresholds [20]. Platinum [21,22], silver [23,24,25,26], gold [27], copper oxide [28], MnOOH [29], or silver nanoparticles (AgNPs) encapsulated in SBA-15 mesoporous silica [30] and electro-deposited on a ZnO film [31] are only a few examples of the metal or metal oxide nanoparticle-based electrodes that have been chemically changed. H2O2 can be detected using electro-analytical techniques.

The optical sensors and biosensors based on the localized surface plasmon resonance (LSPR), which may be emitted by nanostructured noble metals like gold and silver, are an excellent, quick, and low-cost substitute for amperometric nanostructured sensors [32]. Briefly, the passage of electrons through the interior metal framework gets constrained when the size of a metal form shrinks from the bulk scale to the nanoscale. As a result, when incident light enters resonance with the conduction band electrons on the surfaces of metallic nanoparticles, distinct absorption bands of their UV-visible (UV-Vis) spectrum are shown. It merely referred to these oscillations in charge density as LSPR [33]. According to Endo and colleagues [34,35,36,37,38], gold nanoparticles are specifically employed for LSPR excitation and the development of corresponding optical biosensors in medical and food applications. AgNPs have a catalytic activity for the breakdown of H2O2, according to a number of recent research studies [23,39]. Endo et al. [40] and Alzahrani [41] synthesized polyvinylpyrrolidone-coated AgNPs based on an LSPR-based fully optical detection method for the quantitative determination of reactive oxygen species, particularly H2O2. AgNPs with poly(vinyl alcohol) (PVA) caps as a renewable LSPR-based sensor for H2O2 detection and measurement have been suggested by Filippo and colleagues [42].

To obtain silver colloids with nanostructures, wet chemical synthesis was frequently used [43]. Numerous nanomaterial preparations entail hazardous chemicals, poor material conversion, high energy demands, and time-consuming, inefficient purifications. Here, we instead synthesize AgNPs using a green method. There has already been some advancement in the creation of green chemistry that is safe, non-toxic, and acceptable to the environment for the production of noble metal (gold and silver) nanoparticles. For the synthesis of Au and Ag nanoparticles, green reducing agents such as citrate [44,45,46], glucose [47,48,49,50,51], ascorbic acid [52], and hydrogen peroxide [53,54,55] have been investigated. AgNPs can be made using water-soluble polymers, such as gum Arabic, gelatin, PVA, and methyl hydroxyethyl cellulose [46,56,57,58,59]. Starch has recently been used as a green capping agent [48,49,50]. Mehata [60] and Ghaseminezhad et al. [61] have published many studies on green synthesis, while Mouzaki and colleagues have provided an overview of the synthesis of AgNPs [62].

We used Mon Thong durian (Durio zibethinus L.) rind extract [63] as a reducing agent and stabilizer to reduce Ag+ dissolved in AgNO3 solution to AgNPs with a narrow size distribution and demonstrated their applicability as an LSPR-based optical sensor due to the current development on green synthesis techniques for preparing metallic nanoparticles as well as on LSPR based on detection techniques and sensing devices. We make use of the fact that the analyte, H2O2, can be used as an active oxidant for AgNPs and demonstrate that, under suitable experimental conditions, the change in the LSPR absorbance strength caused by the degradation of the as-prepared AgNPs correlates well with the concentration of H2O2. These nanoparticles serve as an unconventional LSPR-based optical sensor that we employ to measure H2O2.

2 Materials and methods

2.1 Preparation of durian rind extract

The Mon Thong durian rinds were used throughout this work. The fresh durian rinds collected during the durian season from the fruit market were cleaned, dried, and the outer layer from the inner layer was separated. Then, it was ground to powder, stored in a vacuum box, and placed at −20°C until it was used to prepare durian rind extract.

About 50 g of the durian outer layer powder was used to prepare the durian rind extract. The powder was boiled in 500 mL of deionized (DI) water for 30 min. The resulting extract was filtered through Whatman filter paper No. 1 with a pore size of 11 µm. The preparation of the inner layer of durian rind extract was the same as that of the outer layer. We stored this extract at 4°C for further experiments.

2.2 Solutions used in the experiment

AgNO3 was used as a substrate for the synthesis of AgNPs using the reduction method. NaOH and HCl solutions were used for adjusting the pH change. AgNO3 was purchased from Poch. When AgNO3 was dissolved in DI water, it caused the dissociation of Ag+, which acts as an electron acceptor (oxidizer) in the reduction process.

2.3 Synthesis of AgNP colloid using durian rind extract as a reducing agent and stabilizer

In this experiment, durian rind was used to synthesize environmentally friendly AgNPs using the Mon Thong durian extract as both a reducing agent and stabilizer. The durian extract will act as the electron distributor to the dissociated Ag+ in AgNO3 solution under light conditions as a catalyst. The process is shown as represented by Eqs. 1 and 2:

(1) AgNO 3 ( s ) H 2 O Ag + ( aq ) + NO 3 ( aq )

(2) Ag + ( aq ) + e light Ag ( s )

First, 30 mL of the durian outer shell extract was mixed with 30 mL of 1 mM AgNO3 solution (1:1 ratio), and the pH of the solution was adjusted to 8.5. The solution was stirred with a magnetic stirrer (Stuart, CB 162) for 3 h at a light intensity of 13,430 lux and a temperature of 25 ± 1°C. The absorbance of the solution was measured in the wavelength range of 300–800 nm with a UV-Vis spectrophotometer (Avantes, AvaSpec-2048). The light source used was a tungsten–deuterium lamp, which generated light in the wavelength range of 177–1,100 nm. The absorbance of the solution was measured by adjusting the absorbance measurement mode (A). The extracted water from durian rind was used as a blank. The same process was repeated but the durian inner shell extract was used instead of the durian outer shell extract.

2.4 Characterization of AgNPs synthesized with the durian rind extract

The AgNPs synthesized with durian rind extract were tested for their qualitative and quantitative characteristics as follows:

  1. UV-Vis spectrophotometer was employed to examine the absorbance of AgNPs synthesized with the extract obtained from the inner and outer shells of durian rind.

  2. TEM (JEOL, JEM-2100) was used to examine the dispersion and shape of the AgNPs.

  3. XRD (Bruker, D8 Advance) was used to analyze the crystalline structure of the elements.

  4. SEM-EDX (JEOL, JSM-6610LV) was used to determine the elemental composition of AgNPs.

2.5 Optical characteristics of the surface plasmon resonance (SPR)-based optical sensor for the detection of H2O2 of AgNP

To evaluate the optical characteristics of AgNP solution as SPR-based H2O2 sensor, 3% of different concentrations of H2O2 solutions diluted with phosphate buffer (pH 7.4) were introduced into the AgNP solution in the quartz cuvette at a ratio of 1:1.5. The change in its optical characteristics with time (0, 5, 10, 15, 20, 30, 40, 60, 80, 100, and 120 min) in the visible range (350–850 nm) was monitored by a UV-Vis spectrophotometer (Avantes, AvaSpec-2048), as shown in Figure 1.

Figure 1 
                  Experimental procedure for SPR optical characterization of colloid AgNPs synthesized from the durian rind extract.
Figure 1

Experimental procedure for SPR optical characterization of colloid AgNPs synthesized from the durian rind extract.

3 Results and discussion

3.1 Durian rind extract and the conditions used in the AgNP synthesis

Before synthesizing AgNPs, the absorbance of durian rind extracted from outer and inner shells was measured. The results showed that the durian extract from the outer shell of durian rind had the highest absorbance at 320.896 nm. In contrast, the extract from the inner shell had the highest absorption at a wavelength of 323.689 nm, which was higher than that from the outer shell. Therefore, the inner shell extract was used to synthesize AgNPs.

In this experiment, the inner shell of the durian rind extract was used as an intermediary for the synthesis of AgNPs because the AgNP colloid extracted from the inner shell had a higher absorption than that of the outer shell. Moreover, the durian inner shell yielded more AgNPs than the outer shell (as presented in Figure 2). Additionally, we have found more fructose and glucose – which act as a reducing agent – and protein and carbohydrates – which act as the stabilizer – in a higher amount than the extract from the outer shell (as shown in Table 1).

Figure 2 
                  Colloid absorbance of AgNPs synthesized using the durian rind extract: (a) outer shell of durian rind and (b) inner shell of durian rind (pH = 8.5; reaction time, 3 h) at a light intensity of 13,430 lux.
Figure 2

Colloid absorbance of AgNPs synthesized using the durian rind extract: (a) outer shell of durian rind and (b) inner shell of durian rind (pH = 8.5; reaction time, 3 h) at a light intensity of 13,430 lux.

Table 1

Nutrient contents in durian rind

Substance Substance content in the outer shell Substance content in the inner shell
Fructose 0.93 g·100 g−1 8.01 g·100 g−1
Glucose 1.01 g·100 g−1 2.17 g·100 g−1
Protein 0.09 g·100 mL−1 0.03 g·100 mL−1
Carbohydrate 0.43 g·100 mL−1 1.13 g·100 mL−1

Therefore, at this stage, the extract from the inner shell of durian rind was recommended as a reducing agent and a stabilizer in the synthesis of AgNPs.

3.2 Effect of reaction times on the absorbance of colloid AgNPs

AgNPs were synthesized using the inner durian rind extract at a light intensity of 13,430 lux with the pH of the solution adjusted to 8.5. Then, the absorbance of the solutions was measured at reaction times of 5, 10, 30 min, 1, 2, 3, 6, 9, and 12 h with a UV-Vis spectrophotometer. With the formation of AgNPs, the color of the solution changed from light yellow (source extract) to yellowish-brown because of the reduction of Ag+ ions in AgNPs as the reaction time was increased gradually up to 12 h, as shown in Figure 3.

Figure 3 
                  Colors of colloids of AgNPs synthesized using an extract from the inner durian rind at a light intensity of 13,430 lux, pH of 8.5, and reaction times of 0 min to 12 h.
Figure 3

Colors of colloids of AgNPs synthesized using an extract from the inner durian rind at a light intensity of 13,430 lux, pH of 8.5, and reaction times of 0 min to 12 h.

As observed in Figure 3, the color of AgNPs synthesized using the inner durian rind extract at a light intensity of 13,430 lux and pH 8.5 had a yellowish-brown color at all reaction times. This result implies that the higher the absorbance, the higher the quantity of AgNPs. Therefore, adjusting the pH of the solution to 8.5 is recommended for synthesizing AgNPs as it generates a higher quantity.

As observed in Figure 4, at a pH of 8.5, the absorbance of the synthesized AgNPs had the highest at 416 nm, which implied the small size of AgNPs. Therefore, adjusting the pH of the solution to 8.5 was recommended in synthesizing AgNPs using an extract from the inner shell of durian rind.

Figure 4 
                  Colloidal absorbance of AgNPs synthesized using an extract from the inner durian rind at a light intensity of 13,430 lux, pH of 8.5, and reaction times of 5 min to 12 h.
Figure 4

Colloidal absorbance of AgNPs synthesized using an extract from the inner durian rind at a light intensity of 13,430 lux, pH of 8.5, and reaction times of 5 min to 12 h.

Figure 4 shows the UV-Vis spectrum recorded from the formation of AgNPs in solution. The appearance of a strong and sharp plasmon band at a wavelength of maximum absorbance (λ max) of 416 nm shows the formation of AgNP colloids. The reaction was completed within 3 h, which can be ascertained by no change in the absorbance. This value of λ max was blue-shifted toward a shorter wavelength of approximately 416 nm at a pH value of 8.5 and the full-width at half-maximum (FWHM) of the absorbance band was 122 nm.

3.3 Dispersion, shape, and size of AgNPs

TEM (JEOL, JEM-2100) was employed to investigate the formation of dispersion and shape of AgNPs synthesized using an extract from the inner durian rind at a light intensity of 13,430 lux and a reaction time of 12 h at a pH of 8.5. The smallest size of AgNPs is shown in Figure 5. Therefore, it can be concluded that the pH of the solution used in the AgNP synthesis (the inner shell of durian rind extract and AgNO3) should be adjusted to 8.5 to get the smallest size of AgNPs.

Figure 5 
                  TEM analysis results: (a) TEM image of AgNPs synthesized from 1 mM AgNO3 solution and durian rind extract at ambient conditions (solution pH = 8.5) and (b) corresponding particle size distribution histogram of AgNPs.
Figure 5

TEM analysis results: (a) TEM image of AgNPs synthesized from 1 mM AgNO3 solution and durian rind extract at ambient conditions (solution pH = 8.5) and (b) corresponding particle size distribution histogram of AgNPs.

The TEM results are shown in Figure 5a, which displays that AgNPs are formed in spherical shapes. Figure 5b shows a relatively narrow size distribution with an average diameter of 10.2 ± 0.2 nm, which corresponds to the XRD pattern, as illustrated in Figure 6. Figure 6 shows the XRD patterns of AgNPs synthesized using the durian rind extract. The XRD pattern shows the sharp peaks of the face-centered cubic (fcc) crystal structure (JCPDS file no.04-0783) with diffraction peaks at 37°, 44°, 64°, and 77° in the 2θ range of 20–80°, which correspond to the (111), (200), (220), and (311) facets of silver, respectively. Therefore, the UV-Vis spectra, TEM images, and XRD patterns are strong evidence to confirm that the method described here is an effective approach for the synthesis of AgNPs. Additionally, EDX analysis was used to estimate the elemental composition of AgNPs. Figure 7 shows that the energy of the elemental silver peak is 3 keV.

Figure 6 
                  X-ray diffraction patterns of the synthesized AgNPs.
Figure 6

X-ray diffraction patterns of the synthesized AgNPs.

Figure 7 
                  SEM-EDX spectrum of the synthesized AgNPs confirming the presence of silver.
Figure 7

SEM-EDX spectrum of the synthesized AgNPs confirming the presence of silver.

3.4 Optical characteristics of the SPR-based optical sensor for the detection of H2O2 of AgNPs

3.4.1 Effect of reaction times on the wavelength and absorbance spectra of dilute H2O2 solution

Dilute H2O2 (10−2 M) was used to determine the effect of reaction times on the wavelength and absorbance of dilute H2O2 solution. The results are shown in Figure 8.

Figure 8 
                     Changes in the SPR absorbance strength with time and the addition of 10−2 M H2O2 solution in the as-synthesized AgNPs solution at a volume ratio of 1:1.5.
Figure 8

Changes in the SPR absorbance strength with time and the addition of 10−2 M H2O2 solution in the as-synthesized AgNPs solution at a volume ratio of 1:1.5.

From Figure 8, the maximum absorbance of 10−2 M H2O2 is at 416 nm, which implies that the lesser the reaction time, the higher the absorbance of dilute H2O2.

In order to determine the effect of dilution on the SPR absorbance strength, we introduced phosphate buffer into the AgNP colloid at a ratio of 1:1.5. The change in the absorbance strength at λ max is because of its dependence on the AgNP concentration. In this experiment, the dilution with buffer solution affects the AgNP concentration. As a result, a volume ratio of H2O2/colloid AgNPs is chosen as 1:1.5 to evaluate the characteristics of the SPR-based sensor.

3.4.2 Concentration of H2O2 and absorbance of the solution

UV-Vis spectrophotometry was employed to determine the absorbance of H2O2 and AgNP solution at different H2O2 concentration levels and a reaction time of 15 min (as shown in Figure 9).

Figure 9 
                     Colors of H2O2 and AgNP solution at different H2O2 concentrations.
Figure 9

Colors of H2O2 and AgNP solution at different H2O2 concentrations.

As shown in Figure 9, the color of H2O2 and AgNP solution faded as the concentration of H2O2 increased. This finding implies that the higher the concentration of H2O2 in the solution, the fadedness of the color of the solution increased.

The spectroscopy measurements showed the formation of AgNPs. The AgNP synthesis was verified by UV-Vis spectroscopy by determining the maximum absorbance at approximately 416 nm because of the SPR. Figure 10 represents the SPR peak at 416 nm of AgNPs, showing a sufficient dispersion, narrow size distribution, and the spherical shape of AgNPs. The addition of 1 mL of 3% H2O2 solution with different volumes of AgNPs leads to a decrease in the SPR absorbance of the AgNPs, leading to the bleaching of the brownish color to a clear solution of AgNPs.

Figure 10 
                     UV-Vis absorption spectra recorded for 15 min after the addition of different concentrations of H2O2 solution to the solution of AgNPs at a volume ratio of 1:1.5.
Figure 10

UV-Vis absorption spectra recorded for 15 min after the addition of different concentrations of H2O2 solution to the solution of AgNPs at a volume ratio of 1:1.5.

3.4.3 Effect of time on changes in the reaction of AgNPs and H2O2 solution at different concentrations

UV-Vis spectrophotometry was employed to analyze the effect of reaction time on changes in the reaction of AgNPs and H2O2 solution at different concentrations, and the results are shown in Figure 11.

Figure 11 
                     The relative changes in the reaction of AgNPs and H2O2 solution at a 15 min reaction time at different concentrations of H2O2 solution.
Figure 11

The relative changes in the reaction of AgNPs and H2O2 solution at a 15 min reaction time at different concentrations of H2O2 solution.

As observed in Figure 11, absorption shows relatively significant changes in the reactions between different concentrations of AgNPs and dilute H2O2 solutions between 0 and 15 min. However, it was found that the reactions became static after 15 min. This reaction pattern represents the reactions of different concentrations of AgNPs and dilute H2O2 solution, as observed in Figure 11. Therefore, 15 min of reaction time was recommended to apply for AgNPs (extracted from the inner layer of durian rind) to an SPR-based optical sensor for the detection of H2O2. The (A 0A t)/A 0 values calculated at a reaction time of 15 min and the concentration of H2O2 are presented in Figure 12. As seen, the absorbance change at a reaction time decreases proportionally to the H2O2 concentration. It can be concluded that the optical sensor studied using the durian rind extract in synthesizing AgNPs ensures a linear response over the wide concentration range of 10−1–10−6 mol·L−1 H2O2 and might be successfully applied in analytical procedures for the determination of H2O2 in various samples such as vegetables and food. The quantification limit, calculated based on the criteria, is 0.9 µmol·L−1.

Figure 12 
                     Relative change in the absorbance strength of the AgNP solution 15 min after the addition of H2O2 solution as a function of H2O2 concentration.
Figure 12

Relative change in the absorbance strength of the AgNP solution 15 min after the addition of H2O2 solution as a function of H2O2 concentration.

Comparing the H2O2 detection performance of AgNPs extracted from durian rind with previous studies, we found that AgNPs obtained from the durian extract in our study had the lowest detection limit compared to other methods (Table 2) [24].

Table 2

Comparison of analytical performances of the methods for the determination of H2O2

Method Detection limit (µM) Linear range References
Decomposition of particles 10 N/A [64]
Decomposition of particles 1.60 10–80 µM [65]
Decomposition of particles 5 10–40 µM [66]
Decomposition of particles 112 60–600 µM [24]
Decomposition of particles 0.9 1 µM to 0.1 M This work

3.4.4 Mechanism of H2O2 detection

From Eqs. 1 and 2, the durian rind extract can be reduced to Ag+ to Ag0 because it is composed of water-soluble polysaccharides that comprise a linear chain of several hundred to over ten thousand ꞵ (1 → 4) linked D-glucose units and low protein content [67]. Glucose generally acts as a reducing agent in the preparation process of AgNPs. After these simple steps, the optical sensor is ready for use.

With the addition of another strong oxidizing agent as H2O2, the reverse process occurs, in which AgNPs are oxidized with the consequent formation of silver oxide, and peroxide is decomposed into water and oxygen [68]. The oxi-reduction occurs as described by the following chemical equations (Eqs. 3 and 4):

(3) 2Ag ( s ) + H 2 O 2 ( ag ) 2Ag + ( aq ) + 2OH ( aq )

(4) 2Ag + ( aq ) + 2OH ( aq ) Ag 2 O ( s ) + H 2 O ( l )

We observed that the intensity of the yellowish-brown color decreases with increasing H2O2 concentration (Figure 9), which is attributed to the oxidation of Ag0.

4 Conclusions and future directions

In this work, we have demonstrated a challenging alternative for the synthesis of AgNPs using the bio-waste durian rind as a low-cost biological reducing agent. By using this strategy, agricultural wastes may be used more effectively and the garbage that could have an adverse effect on the environment can be disposed of. The effective utilization of the hydroxyl groups of glucose as a reducing agent and starch or protein as a stabilizer may contribute to the green production of AgNPs from durian rind. Only spherical particles were formed, with an average diameter of 10.2 ± 0.2 nm.

Our synthesis produced AgNPs with an SPR band at 416 nm, good colloidal AgNP stability, and intermediate catalytic activity for the oxidation of H2O2. The SPR band’s absorbance intensity significantly varies depending on the H2O2 concentration due to the degradation of AgNPs due to the catalytic breakdown of H2O2. An SPR-based sensor for the detection of H2O2 is suggested based on this technique. This sensor responds linearly and with exceptional sensitivity throughout a wide range of 10−1–10−6 mol·L−1 H2O2. The quantitative limit of detection, according to our findings, is 0.9 µmol·L−1 H2O2. The application of an SPR-based optical sensor for H2O2 detection and for the detection of other reactive oxygen species is possible.

H2O2 is a crucial chemical used in many industrial processes including textile, pharmaceutical, culinary, cleaning, and disinfection. As mentioned above, H2O2 detection is effective over a wide range of concentrations. For these sensors to be extensively used in the aforementioned industrial applications, we still need to improve in terms of sensitivity and selectivity for H2O2 in varied samples. AgNPs are a type of nanomaterial that is used to enhance the performance of sensors in various environmental conditions. To allow continuous monitoring necessary for industrial applications, further efforts will need to be made to address the sensor contamination concerns in various sample types. In conclusion, the flexible detection range, straightforward construction technique, and affordable price of optical sensors make them suitable for a variety of applications.

Acknowledgements

The authors would like to thank the Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Krungthep and Green Synthesis and Application Laboratory, Applied Science and Engineering for Social Solution Research Unit, Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi for providing measuring equipment. The authors are grateful to the Department of Chemistry, Faculty of Science, Mahidol University, for providing XRD measurement.

  1. Funding information: The authors state no funding was involved.

  2. Author contributions: Fueangfakan Chutrakulwong: conceptualization, data curation, formal analysis, resources, validation, writing – original draft, and writing – review and editing; Kheamrutai Thamaphat: conceptualization, methodology, resources, supervision, validation, and writing – review and editing.

  3. Conflict of interest: The authors state no conflict of interest.

  4. Data availability statement: The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.

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Received: 2023-04-19
Revised: 2023-06-29
Accepted: 2023-07-24
Published Online: 2023-08-09

© 2023 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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