< Back to previous page

Publication

Tracing Gold Nanoparticle Charge by Electrolyte Insulator Semiconductor Devices

Journal Contribution - Journal Article

A capacitive field-effect electrolyte-insulator-semiconductor (EIS) device was applied for the first time to trace the charge of supported gold nanoparticles (Au-NPs) induced by oxygen plasma treatment or due to storing in aqueous oxidation and reduction solutions. In addition, X-ray photoelectron spectroscopy (XPS) has been used as a reference method to establish the various charge states of the Au-NPs resulting from the different treatment steps. After the oxygen-plasma treatment, a shift of the capacitance voltage (C-V) curve (and flatband potential) of the Au-NP-covered p-Si-SiO2 EIS structure by about -300 mV was found. The exposure of the EIS sensor surface to an oxidative and a reductive solution resulted in a shift of the C-V curve for -85 and +81 mV, respectively. These observations correlate well with corresponding binding energy shifts in Au 4f core spectra in XPS experiments. The obtained results may open new opportunities for biosensing and biochips based on nanoparticle-charge-gated field-effect devices.
Journal: Journal of Physical Chemistry C
ISSN: 1932-7447
Issue: 11
Volume: 115
Pages: 4439 - 4445
Publication year:2011
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:2
CSS-citation score:1
Authors:International
Authors from:Government, Higher Education, Private
Accessibility:Closed