Ultrafast laser micro-nano structured superhydrophobic teflon surfaces for enhanced SERS detection via evaporation concentration
-
Xinyu Hu
,
Mingyong Cai
Abstract
Evaporation concentration of target analytes dissolved in a water droplet based on superhydrophobic surfaces could be able to break the limits for sensitive trace substance detection techniques (e.g. SERS) and it is promising in the fields such as food safety, eco-pollution, and bioscience. In the present study, polytetrafluoroethylene (PTFE) surfaces were processed by femtosecond laser and the corresponding processing parameter combinations were optimised to obtain surfaces with excellent superhydrophobicity. The optimal parameter combination is: laser power: 6.4 W; scanning spacing: 40 μm; scanning number: 1; and scanning path: 90 degree. For trapping and localising droplets, a tiny square area in the middle of the surface remained unprocessed for each sample. The evaporation and concentration processes of droplets on the optimised surfaces were performed and analyzed, respectively. It is shown that the droplets with targeted solute can successfully collect all solute into the designed trapping areas during evaporation process on our laser fabricated superhydrophobic surface, resulting in detection domains with high solute concentration for SERS characterisation. It is shown that the detected peak intensity of rhodamine 6G with a concentration of 10−6m in SERS characterisation can be obviously enhanced by one or two orders of magnitude on the laser fabricated surfaces compared with that of the unprocessed blank samples.
Acknowledgement
The authors acknowledge the support by the National Key R & D Program of China (Grant No. 2017YFB1104300), the National Natural Science Foundation of China (funder id: http://dx.doi.org/10.13039/501100001809, Grant No. 51575309, 51210009, 51905303) and China Postdoctoral Science Foundation (funder id: http://dx.doi.org/10.13039/501100002858, Grant No. 2018M641343).
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/aot-2019-0072).
©2020 THOSS Media & De Gruyter, Berlin/Boston
Articles in the same Issue
- Cover and Frontmatter
- Community
- Conference Notes
- Topical Issue: Laser Micro- and Nano-Material Processing – Part 1
- Editorial
- Laser micro- and nano-material processing – Part 1
- Review Articles
- Formation of laser-induced periodic surface structures on different materials: fundamentals, properties and applications
- Laser interference ablation by ultrashort UV laser pulses via diffractive beam management
- Direct femtosecond laser surface structuring with complex light beams generated by q-plates
- Research Articles
- Effects of laser processing conditions on wettability and proliferation of Saos-2 cells on CoCrMo alloy surfaces
- Interference-based laser-induced micro-plasma ablation of glass
- Ultrafast laser micro-nano structured superhydrophobic teflon surfaces for enhanced SERS detection via evaporation concentration
- High-quality net shape geometries from additively manufactured parts using closed-loop controlled ablation with ultrashort laser pulses
Articles in the same Issue
- Cover and Frontmatter
- Community
- Conference Notes
- Topical Issue: Laser Micro- and Nano-Material Processing – Part 1
- Editorial
- Laser micro- and nano-material processing – Part 1
- Review Articles
- Formation of laser-induced periodic surface structures on different materials: fundamentals, properties and applications
- Laser interference ablation by ultrashort UV laser pulses via diffractive beam management
- Direct femtosecond laser surface structuring with complex light beams generated by q-plates
- Research Articles
- Effects of laser processing conditions on wettability and proliferation of Saos-2 cells on CoCrMo alloy surfaces
- Interference-based laser-induced micro-plasma ablation of glass
- Ultrafast laser micro-nano structured superhydrophobic teflon surfaces for enhanced SERS detection via evaporation concentration
- High-quality net shape geometries from additively manufactured parts using closed-loop controlled ablation with ultrashort laser pulses
