ANYL 136 |
| Multilayer thin films containing gold nanoparticles (AuNPs) and arginine-displayed viruses were prepared by layer-by-layer self-assembly on the quartz slide. The formation of the AuNPs/virus films was monitored by sharp surface plasmon resonance (SPR) absorption band arising from AuNPs. The SPR spectra of the films were greatly red-shifted compared with AuNPs in solution, suggesting that AuNPs in the films are linked well with the viruses, which was confirmed by transmission electron microscopy. The virus-terminated films showed enhanced absorbance and red-shift in wavelength in comparison with AuNPs-terminated film, suggesting that the viruses played an important role in linking AuNPs. The SPR spectra of the AuNPs/virus films were systematically red-shifted with the increasing water-vapor contents in the air. A humidity sensor was fabricated from a film containing 4 bilayers of AuNPs/virus by testing its response to the changing of ambient relative humidity. The response of the humidity sensor was fast and reversible. |
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Nanomaterials in Analytical Chemistry
8:25 AM-12:25 PM, Monday, April 7, 2008 Morial Convention Center -- Rm. 335, Oral
Division of Analytical Chemistry |