Figure 1.

a The IdsVds characteristics of a single WO3 nanowire under dark and 312-nm UV illumination (~1 mW/cm2). The inset is an SEM image of a single WO3 nanowire device. b The persistent photoconductivity of the WO3 nanowire with Vds = 0.2 V.

Huang and Zhang Nanoscale Res Lett 2011 6:52   doi:10.1007/s11671-010-9800-1