1. Designing and fabricating composites of PNIPAM@Au nanorods with tunable plasmon coupling for highly sensitive SERS detection
- Author
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Benhong Yang, Xianghu Tang, Pan Li, and Yiping Wu
- Subjects
Materials science ,Mechanical Engineering ,Composite number ,Surface plasmon ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Laser ,01 natural sciences ,0104 chemical sciences ,law.invention ,symbols.namesake ,Optical microscope ,Mechanics of Materials ,law ,Self-healing hydrogels ,symbols ,General Materials Science ,Nanorod ,0210 nano-technology ,Excitation ,Raman scattering - Abstract
In this study, hybrid substrates composed of poly( N -isopropylacrylamide) hydrogels and Au nanorods (PNIPAM@AuNRs) that exhibit tunable plasmon coupling are designed and fabricated. In this process, Au NRs are deposited on the surface of a PNIPAM hydrogel, and the temperature is increased, causing the hydrogel template to shrink, thereby driving the Au NRs closer to each other. The resulting surface plasmon resonances (SPR) of the composite are observed as a large red-shift. The formation of more hot spots increases the already high sensitivity of surface-enhanced Raman scattering (SERS) detection, and the tunable optical properties enable closer matching of the laser to the near-infrared excitation required. Moreover, these hybrid substrates can be conveniently identified by optical microscopy, enabling in situ SERS detection with high sensitivity and reproducibility.
- Published
- 2016
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