Self‐Organized Growth of Catalyst‐Free Single Crystal WnO3n‐2 (n = 25) Nanowire Bundles on Si (111) via Selective He+ Ion Irradiation
Abstract Tungsten oxides (WOx) possess unique properties due to a synergy of multiple effects arising from their wide range of stoichiometric and sub‐stoichiometric compositions, defect chemistry, and polymorphism. Synthesis and incorporation of 1D WOx nano‐assemblies is an attractive pathway to ena...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2025-05-01
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| Series: | Advanced Materials Interfaces |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/admi.202400907 |
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| Summary: | Abstract Tungsten oxides (WOx) possess unique properties due to a synergy of multiple effects arising from their wide range of stoichiometric and sub‐stoichiometric compositions, defect chemistry, and polymorphism. Synthesis and incorporation of 1D WOx nano‐assemblies is an attractive pathway to enable highly efficient next‐generation photocatalysts, sensors, and optoelectronic devices offering tunability over electro‐optical response in a wide range of the spectrum, from UV–vis to NIR. However, synthesis of the metal oxide nano‐patterns represents a technological challenge, often requiring the presence of a catalyst. Herein, a simple and economical method of synthesizing a catalyst‐free self‐organized sub‐stoichiometric WnO3n‐2 (n = 25) single crystal nanowire bundles by selectively irradiating a Mo‐Ni doped WOx surface with low‐energy He+ ions (27 eV) at 700 °C is reported. The synergetic effect of multiple factors including temperature, effective local electric field along the exposed area of the sample, and the micro‐gap between the mask and the WOx (Mo – Ni) film, suitable oxygen content, doping, as well as shielding the nanowire growth area from the direct He+ ion irradiation is suggested to drive the single‐crystal wire growth. Adjustment is also observed in the effective refractive index and extinction coefficient values in the synthesized WnO3n‐2 nanorods across the solar spectrum. |
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| ISSN: | 2196-7350 |