Fig. 2From: Positive and Negative Photoconductivity Conversion Induced by H2O Molecule Adsorption in WO3 Nanowirea I-T curves recorded on a bias sweep range of 12 V in the dark and under illumination (445 nm, 500 mW) at 70% RH. b The plots of ln(I) versus V1/2. c Diagram of the mechanism of the NPC of the WO3 NW. The inset of a: the I-V curves on a bias sweep range of 12 VBack to article page