Photothermal Conversion of W₁₈O₄₉ with a Tunable Oxidation State.

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Tungsten oxide (W₁₈O₄₉) is a nanomaterial with potential applications.
• Controlling the oxidation state of nanomaterials is crucial for tuning their properties.

Purpose of the Study:

• To synthesize W₁₈O₄₉ with tunable oxidation states.
• To investigate the effect of redox agents on W₁₈O₄₉ morphology and properties.
• To evaluate the photothermal conversion efficiency of reduced W₁₈O₄₉.

Main Methods:

• Solvothermal synthesis using NaNO₃ or NaBH₄ as redox agents.
• Characterization of W₁₈O₄₉ morphology and crystal structure.
• Spectroscopic analysis to study valence states and absorption features.
• Photothermal conversion efficiency measurements.

Main Results:

• W₁₈O₄₉ was successfully synthesized with tunable oxidation states.
• Redox agents did not affect the hexagonal nanowire morphology of W₁₈O₄₉.
• Reduced W₁₈O₄₉ (rich in W⁵⁺) exhibited enhanced localized surface plasmon resonance due to oxygen vacancies.
• High photothermal conversion efficiency (59.6%) and good stability were observed for reduced W₁₈O₄₉.

Conclusions:

• Tunable oxidation states in W₁₈O₄₉ can be achieved using redox agents.
• Oxygen vacancies play a key role in enhancing the photothermal properties of W₁₈O₄₉.
• Reduced W₁₈O₄₉ is a promising material for photothermal applications.