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.


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.