光学精密工程2017，Vol.25Issue(3)：625-631,7.DOI:10.3788/OPE.20172503.0625
球形金纳米颗粒的消光特性及不同折射率环境下的共振波长
Extinction characteristics and resonant wavelength of spherical gold nanoparticles in different ambient mediums
摘要
Abstract
In order to study extinction characteristic of spherical Au nanoparticles and the relation between resonance wavelength and ambient refractive index,the extinction spectra of spherical Au nanoparticles in diameters of 20,40,60 and 80 nm in mediums with different refractive indexes were calculated with Mie theory.The absorbance of Au nanoparticles in the four particle sizes was measured in sweet water with different concentrations experimentally to obtain relation between refractive index of medium in sweet water and the concentration,dispersion law,extinction coefficient of Au nanoparticle and the variation of resonance wavelength with ambient refractive index.The results show that when concentration of sweet water in medium environment are constant while radius of Au nanoparticle is increasing,red shift of extinction peak can be discovered;when radius of nanoparticle is constant while concentration of sweet water in medium environment is increasing,red shift of extinction peak can be discovered.The resonance wavelength of Au nanoparticle is linear to the concentration of sweet water with linear slopes corresponding to Au nanoparticles in diameters of 20,40,60 and 80 nm are 0.106 0,0.135 5,0.193 8 and 0.265 8 respectively.The slope increases with the growth of particle size.These conclusions have laid the foundation for exploring the refractive index sensitivity of nanoparticles.关键词
纳米颗粒/散射/消光法/色散/吸光度Key words
nanoparticles/scattering/extinction method/absorbance/dispersion分类
数理科学引用本文复制引用
罗道斌,韩香娥,段璐杰..球形金纳米颗粒的消光特性及不同折射率环境下的共振波长[J].光学精密工程,2017,25(3):625-631,7.基金项目
陕西省协同创新计划资助项目(No.2015XT65) （No.2015XT65）
