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Protonation and deprotonation processes of c-axis oriented monoclinic WO3 epitaxial films were studied by fabricating a solution-gate device operated in H2SO4 aqueous solution. The protonation process by positive gate biasing brought about an optical transmittance decrease in visible (VIS) and near-infrared (NIR) regions. The deprotonation process by negative gate biasing recovered the decrease in...
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