Cheng Chia-Sheng, Chen Yu-Quan, Lu Chia-Jung
Department of Chemistry, Fu-Jen Catholic University, 510 Chung Cheng Road, Hsingchuang, Taiwan, ROC.
Talanta. 2007 Sep 15;73(2):358-65. doi: 10.1016/j.talanta.2007.03.058. Epub 2007 Apr 7.
The response of localized surface plasmon resonance (LSPR) spectra of gold and silver nanoparticles, and gold nanoshells to organic vapors was investigated. The surface area of nanomaterials was sufficiently high for quantitative adsorption of volatile organic compounds (VOCs). Surface adsorption and condensation of VOCs caused the environmental refractive index to increase from n=1.00 in pure air to as high as n=1.29 in near saturated toluene vapor. The extinction and wavelength shift of the LSPR spectra were very sensitive to changes in the surface refractive index of the nanoparticles. Responses of the LSPR band were measured with a real-time UV-vis spectrometer equipped with a CCD array detector. The response of silver nanoparticles to organic vapors was most sensitive in changes in extinction, while gold nanoshells exhibited red-shifts in wavelength ( approximately 250nm/RIU) when exposed to organic vapors. The LSPR spectral shifts primarily were determined by the volatility and refractive indices of the organic species. The T(90) response time of the VOC-LSPR spectrum was less than 3s and the response was completely reversible and reproducible.
研究了金、银纳米颗粒以及金纳米壳的局域表面等离子体共振（LSPR）光谱对有机蒸汽的响应。纳米材料的表面积足够大，可实现挥发性有机化合物（VOCs）的定量吸附。VOCs的表面吸附和冷凝导致环境折射率从纯空气中的n = 1.00增加到接近饱和甲苯蒸汽中的n = 1.29。LSPR光谱的消光和波长偏移对纳米颗粒表面折射率的变化非常敏感。使用配备电荷耦合器件（CCD）阵列探测器的实时紫外-可见光谱仪测量LSPR带的响应。银纳米颗粒对有机蒸汽的响应在消光变化方面最为敏感，而金纳米壳在暴露于有机蒸汽时表现出波长红移（约250nm/RIU）。LSPR光谱位移主要由有机物种的挥发性和折射率决定。VOC-LSPR光谱的T(90)响应时间小于3秒，响应完全可逆且可重复。
