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Decoration of reduced graphene oxide by gold nanoparticles: an enhanced negative photoconductivity

Abstract

Photodetection in a visible light region is important in various applications, including computation, environment monitoring, biological detection and industrial control. Due to that, researches to develop photoconductive devices have great significance. We report a study on the photoconductivity of reduced graphene oxide (rGO)/gold nanoparticles (AuNPs) nanocomposites, emphasizing the enhancement effect induced by AuNPs. rGO/AuNPs photoelectric devices were prepared by spincoating rGO onto AuNPs-array-covered silicon substrate. Photoelectric responses under visible light illumination were measured and the results showed that the negative photoelectric responsivity of rGO was improved by 3 orders of magnitude due to AuNPs. The effects of AuNPs on negative photoconductivity (NPC) property of rGO were investigated, and it is found that AuNPs affected NPC in three aspects: (1) AuNPs form discrete electrodes separated by nanoscale gaps which generated new conduction paths, and hence the conductivity of rGO was enhanced by 3 orders of magnitude; (2) Localized surface plasmon resonance (LSPR) of AuNPs effectively enhance total light absorption of rGO; (3) Photocurrent between AuNPs and rGO can weaken the NPC property of rGO. The low-cost and mass-producible rGO/AuNPs nanocomposites demonstrate high photoelectric responsivity, which holds much promise for NPC devices.

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Publication details

The article was received on 15 Jul 2017, accepted on 01 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR05143C
Citation: Nanoscale, 2017, Accepted Manuscript
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    Decoration of reduced graphene oxide by gold nanoparticles: an enhanced negative photoconductivity

    Q. Wang, Y. Tu, T. Utsunomiya, T. Ichii, H. Sugimura, L. Hao, R. Wang and X. He, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05143C

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