Gold Hollow Nanospheres: Tunable Surface Plasmon Resonance Controlled by Interior-Cavity Sizes

• DOI: 10.1021/jp045006f
• Publication Date: 2005-04-21T04:39:47Z
• Authors: Han-Pu Liang; Li-Jun Wan; Chun-Li Bai; Li Jiang
• Keywords: Localized surface plasmon

Uniform gold hollow nanospheres with tunable interior-cavity sizes were fabricated by using Co nanoparticles as sacrificial templates and varying the stoichiometric ratio of starting material HAuCl4 over reductants. The formation these nanostructures is attributed to two subsequent reduction reactions: initial nanoparticles, followed NaBH4. In addition, a thick layer silica was successfully coated onto nanospheres. These are extensively characterized TEM, XRD, HRTEM, SEM, electron diffraction, energy-dispersive X-ray analysis, UV-visible absorption spectroscopy. It evident that SPR peak locations corresponding shifted region more than 100 nm wavelength due changes shell thickness, which make optically active great interest in both fundamental research practical applications.