Syntheses and Photoelectrochemical Properties of Plasmonic Molybdenum Oxide Nanoparticles Via Ionic Liquid/Metal Sputtering

摘要

Incident lights interact with noble metal nanoparticles (NPs) to form collective oscillations of free electrons, creating a strong electromagnetic field on their surface. This phenomenon is called localized surface plasmon resonance (LSPR). Recently metal oxide NPs with appreciable concentration of free electrons have been also reported to exhibit LSPR peaks, the peak wavelengths of which were controlled from the visible to near-IR regions. When a plasmonic NP was combined with a semiconductor, the excitation of LSPR could cause the injections of electrons and/or holes from plasmonic NPs to the semiconductor, that is, the plasmon-induced charge separation (PICS). Since the PICS was reported using plasmonic metal oxide NPs, the intense research has been devoted to studying plasmonic metal and metal oxide NPs for the application to photovoltaics, photocatalyts, and biosensors.