期刊
ACS NANO
卷 4, 期 11, 页码 6565-6572出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn101804v
关键词
gold nanorods; hollow microspheres; mesoporous silica; plasmon resonance; scattering
类别
资金
- Hong Kong RGC GRF [CUHK403409, 2160391, 2060393]
Localized surface plasmon resonances of noble nanocrystals are powerful in enhancing a variety of linear and nonlinear optical signals and photorelated processes. Here demonstrate the plasmonic enhancement of the light scattering from hollow mesoporous silica microspheres by attaching a dense layer of gold nanocrystals onto the outer surface of the microspheres. The attachment of gold nanocrystals induces both the shift and intensity increase in the resonant scattering peaks of the nanospheres. The spectral region of the resonant scattering enhancement can be controlled by using gold nanocrystals with different plasmon resonance wavelengths. The spectral region of the enhancement is independent of the microsphere diameter. The scattering enhancement factor ranges from 20 to 130, depending on the plasmonic properties and surface coverage of the attached gold nanocrystals. The systematic evolution the scattering spectra of the individual microsphere is also revealed by chemically etching away the attached gold nanocrystals gradually
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