Photothermal Conversion of W 18 O 49 with a Tunable Oxidation State

摘要

Abstract W 18 O 49 with a tunable oxidation state was prepared by addition of NaNO 3 or NaBH 4 as a redox agent in the solvothermal system. The addition of redox agents has no influence on the crystallization of W 18 O 49 . The obtained W 18 O 49 structures keep their morphology as a bundle of nanowires with a regular hexagonal on the cross-section. W 18 O 49 exhibits strong valence-dependent absorption features in the near-IR region. Reduced W 18 O 49 with more W 5+ has a higher concentration of oxygen vacancies, which enhances the localized surface plasmon resonance effect. Reduced W 18 O 49 exhibits a high photothermal conversion efficiency of 59.6 % and has good photothermal stability.