TiO<sub>2</sub>@COF Nanowire Arrays: A "Filter Amplifier" Heterojunction Strategy to Reverse the Redox Nature.
basic_science · Level V
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- Record sourced from PubMed, PMID 37017682.
- Also identified by DOI 10.1021/acs.nanolett.3c00804.
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Abstract
Surface modification is a promising method to change the surface properties of nanomaterials, but it is limited in enhancing their intrinsic redox nature. In this work, a "filter amplifier" strategy is proposed for the first time to reverse the intrinsic redox nature of materials. This is demonstrated by coating a COF-316 layer with controlled thickness on TiO<sub>2</sub> to form core-sheath nanowire arrays. This unique structure forms a Z-scheme heterojunction to function as "a filter amplifier" which can conceal the intrinsic oxidative sites and increase the extrinsic reductive sites. Consequently, the selective response of TiO<sub>2</sub> is dramatically reversed from reductive ethanol and methanol to oxidative NO<sub>2</sub>. Moreover, TiO<sub>2</sub>@COF-316 provides remarkably improved sensitivity, response, and recovery speed, as well as unusual anti-humidity properties as compared with TiO<sub>2</sub>. This work not only provides a new strategy to rationally modulate the surface chemistry properties of nanomaterials but also opens an avenue to design high-performance electronic devices with a Z-scheme heterojunction.