Morphology-Dependent Voltage Sensitivity of a Gold Nanostructure

Gold nanostructures of various morphologies, including nanospheres, nanorods, nanoprisms, and thin films, were immobilized on ITO-coated coverslips in order to investigate the response of their scattering to potential. Shifts in the plasmon band obtained by potential-modulated spectroscopic imaging...

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Bibliographic Details
Published in:Langmuir 2011-11, Vol.27 (22), p.13950-13961
Main Authors: Huang, Yu, Pitter, Mark C, Somekh, Michael G
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Devices and Applications: Sensors, Fluidics, Patterning, Catalysis, Photonic Crystals
Electrochemistry
Exact sciences and technology
General and physical chemistry
Gold - chemistry
Metal Nanoparticles
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Spectrum Analysis - methods
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Summary:Gold nanostructures of various morphologies, including nanospheres, nanorods, nanoprisms, and thin films, were immobilized on ITO-coated coverslips in order to investigate the response of their scattering to potential. Shifts in the plasmon band obtained by potential-modulated spectroscopic imaging indicated that the voltage sensitivity of the gold nanostructure is dependent on its morphology, with nanospheres exhibiting the lowest sensitivity and ultrathin gold films exhibiting the highest. The effects of potential on gold nanoparticles are in qualitative agreement with Mie and Gans’ theories in which the shift of the gold plasma frequency is due to the charging–discharging of the nanoparticles.
ISSN:0743-7463
1520-5827
DOI:10.1021/la202983d