期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 14, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-012-0766-z
关键词
Silica-shell; Scattering-type scanning near-field optical microscopy (s-SNOM); Coating layers; Core-shell nanoparticles; Near-field infrared imaging
资金
- Department of Physics and Astronomy, California State University, Long Beach
- College of Natural Science and Mathematics (CNSM), California State University, Long Beach
- California State University, Long Beach
- American Chemical Society (ACS) [50461-UNI10]
- Research Corporation for Science
Spectroscopic near-field imaging of single silica-shell/Au-core and pure silica nanoparticles deposited on a silicon substrate is performed in the infrared wavelength range (lambda = 9-11 mu m) using scattering-type scanning near-field optical microscopy (s-SNOM). By tuning the wavelength of the incident light, we have acquired information on the spectral phonon-polariton resonant near-field interactions of the silica-shell/Au-core and pure silica nanoparticles with the probing tip. We made use of the enhanced near-field coupling between the high index Au-core and the probing tip to achieve spectral near-field contrast of the thin silica coating (thickness < 10 nm). Our results show that spectroscopic imaging of thin coating layers and complex core-shell nanoparticles can be directly performed by s-SNOM.
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