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Fermi Level Equilibration of Ag and Au Plasmonic Metal Nanoparticles supported on Graphene Oxide.

Abstract

For the first time, the process of Fermi level equilibration has been studied and compared for the metal nanoparticles supported on conducting substrates i.e. GO sheets. The extent of Fermi level equilibration has been monitored by recording the changes in position and intensity of the surface plasmon resonance (SPR) band of Ag and Au plasmonic metal nanoparticles (PMNPs) supported on reduced graphene oxide (rGO). Ag PMNPs supported on rGO shows larger variation in SPR band position and intensity as compared to rGO supported Au PMNPs. The average shift in the chemical potential has been determined through the changes in SPR band position for Ag, Ag@rGO, Au, and Au@rGO, which are approximately, -1812 ± 70 mV, -171 ± 20 mV, -96 ± 8 mV and -29 ± 4 mV, respectively. The calculated values of shift in chemical potential suggest that Ag and its rGO composite are more prone to Fermi level equilibration as compared to the Au and Au@rGO composite. The electrochemical (galvanostatic) charging/discharging (GCD) measurements also brace the observations from chemical charging/discharging method with minor variations due to the measurements under two different conditions; particulate films in case of the former versus dispersed phase in case of the later. Moreover, the average capacitance associated with single nanoparticle (Ag and Au) is estimated using the capacitance values determined from GCD curves and the approximate number of nanoparticles detemined from the quanitity of PMNPs used in deposited film for GCD measurements. These values are in close agreement with the quantized double layer capacitance values of monolayer protected clusters reported in the literature. Similar inference is also drawn from enzyme-less glucose sensing activity of these nanostructures, where Ag and Ag@rGO shows better activity in terms of lower values of limit of detection (LOD) and limit of quantification (LOQ).

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Supplementary files

Publication details

The article was received on 14 Aug 2018, accepted on 26 Sep 2018 and first published on 26 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP05170D
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Fermi Level Equilibration of Ag and Au Plasmonic Metal Nanoparticles supported on Graphene Oxide.

    A. N. Singh, H. Devnani, S. Jha and P. Ingole, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP05170D

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