Graphene-Skeleton Heat-Coordinated and Nanoamorphous-Surface-State Controlled Pseudo-Negative-Photoconductivity of Tiny SnO₂ Nanoparticles

Longwei Ding; Nishuang Liu; Luying Li; Xing Wei; Xianghui Zhang; Jun Su; Jiangyu Rao; Congxing Yang; Wenzhi Li; Jianbo Wang; Haoshuang Gu; Yihua Gao

doi:10.1002/adma.201500804

Graphene-Skeleton Heat-Coordinated and Nanoamorphous-Surface-State Controlled Pseudo-Negative-Photoconductivity of Tiny SnO₂ Nanoparticles

Adv Mater. 2015 Jun 17;27(23):3525-32. doi: 10.1002/adma.201500804. Epub 2015 May 7.

Authors

Longwei Ding¹, Nishuang Liu¹, Luying Li¹, Xing Wei¹, Xianghui Zhang^{1

2}, Jun Su¹, Jiangyu Rao¹, Congxing Yang¹, Wenzhi Li³, Jianbo Wang⁴, Haoshuang Gu², Yihua Gao^{1

2}

Affiliations

¹ Center for Nanoscale Characterization and Devices, Wuhan National Laboratory for Optoelectronics-School of Physics-School of Optical and Electronic Information, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, 430074, PR China.
² Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, PR China.
³ Department of Physics, Florida International University, Miami, FL, 33199, USA.
⁴ School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-Structures, Wuhan University, Wuhan, 430072, PR China.

PMID: 25953332
DOI: 10.1002/adma.201500804

Abstract

SnO2 nanoparticles display a pseudo-negative-photoconductivity (PsdNPC) effect, which shows that their resistance increases under light irradiation via a heating effect. The PsdNPC originates from intensive electron scattering of the nanoamorphous surface state of the SnO2 nanoparticles, resulting in a small inner current and a large absorption of moisture, leading to a large surface current. Graphene as the inner skeleton can shorten the response and recovery times.

Keywords: SnO2 nanoparticles; graphene; heat-coordinated; nanoamorphous-surface-states; pseudo-negative-photoconductivity.