Optically Activated 3D Thin‐Shell TiO2 for Super‐Sensitive Chemoresistive Responses: Toward Visible Light Activation

Autor: Donghwi Cho, Jun Min Suh, Sang‐Hyeon Nam, Seo Yun Park, Minsu Park, Tae Hyung Lee, Kyoung Soon Choi, Jinho Lee, Changui Ahn, Ho Won Jang, Young‐Seok Shim, Seokwoo Jeon
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Advanced Science, Vol 8, Iss 3, Pp n/a-n/a (2021)
Druh dokumentu: article
ISSN: 2198-3844
20200188
DOI: 10.1002/advs.202001883
Popis: Abstract One of the well‐known strategies for achieving high‐performance light‐activated gas sensors is to design a nanostructure for effective surface responses with its geometric advances. However, no study has gone beyond the benefits of the large surface area and provided fundamental strategies to offer a rational structure for increasing their optical and chemical performances. Here, a new class of UV‐activated sensing nanoarchitecture made of highly periodic 3D TiO2, which facilitates 55 times enhanced light absorption by confining the incident light in the nanostructure, is prepared as an active gas channel. The key parameters, such as the total 3D TiO2 film and thin‐shell thicknesses, are precisely optimized by finite element analysis. Collectively, this fundamental design leads to ultrahigh chemoresistive response to NO2 with a theoretical detection limit of ≈200 ppt. The demonstration of high responses with visible light illumination proposes a future perspective for light‐activated gas sensors based on semiconducting oxides.
Databáze: Directory of Open Access Journals
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