The interparticle gap manipulation of Au-Ag nanoparticle arrays deposited on flexible and atmospheric plasma-treated PDMS substrate for SERS detection
Autor: | Wei-Lin Syu, Chia-Wei Hsiao, Yu-Wei Cheng, Ting-Yu Liu, Zi-Ling Zeng |
---|---|
Rok vydání: | 2020 |
Předmět: |
Materials science
Scanning electron microscope Nanoparticle Atmospheric-pressure plasma Nanotechnology macromolecular substances 02 engineering and technology 010402 general chemistry 01 natural sciences Contact angle chemistry.chemical_compound Materials Chemistry chemistry.chemical_classification Polydimethylsiloxane Biomolecule technology industry and agriculture Substrate (chemistry) Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry 0210 nano-technology Layer (electronics) |
Zdroj: | Surface and Coatings Technology. 389:125653 |
ISSN: | 0257-8972 |
Popis: | Au-Ag nanoparticle arrays were deposited on a flexible and surface-modified polydimethylsiloxane (PDMS) substrate for surface-enhanced Raman scattering (SERS). The surface of the PDMS substrate was modified to be a hydrophilic layer by nitrogen (N2) atmospheric plasma treatment. When compared to the non-plasma-treated PDMS substrate, the contact angle of the plasma-treated PDMS substrate decreased from 115.4° to 32° to form the hydrophilic surface of the PDMS substrate. The uniform Au-Ag nanoparticle arrays were further deposited by thermal evaporation on the plasma-treated PDMS substrate that was evaluated by scanning electron microscopy (SEM). The results indicate that the Au-Ag@PDMS-N2 substrate exhibited highly sensitive and reproducible SERS spectra of adenine (10−4 M) due to the homogeneous and narrow interparticle gap (~2 nm) between Au-Ag nanoparticles. Particularly, the SERS intensity of 2Au-6Ag@PDMS-N2 substrate increased ~4 times under a bending angle of 5°. This indicated that the flexible behaviors of the PDMS-based SERS substrate can effectively manipulate the interparticle gap between Au-Ag nanoparticles by bending the SERS substrate. Therefore, the flexible and ultrasensitive SERS substrate fabricated by Au-Ag nanoparticles deposited on plasma-treated PDMS substrate provides enormous potential for practical applications in detecting biomolecules and environmental pollutants. |
Databáze: | OpenAIRE |
Externí odkaz: |