Cu2O/Cu-ZnO@ZnO microspheres for ultrasensitive detection of formaldehyde at room temperature

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-03-31 DOI:10.1016/j.apsusc.2025.163133

Huibin Shi , Yiyi Yang , Yibing Liu , Weiguo Xu , Shuo Li

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Abstract

The formation of p-n junctions in semiconductor materials enhances gas-sensing performance through regulated interfacial charge transfer dynamics to improve sensitivity and selectivity. Based on this concept, controlled Cu-doping enables the rational design of core–shell Cu-ZnO@ZnO homojunction microspheres and hierarchical Cu₂O/Cu-ZnO@ZnO microspheres. The Cu-ZnO@ZnO and Cu₂O/Cu-ZnO@ZnO microspheres exhibit distinct formaldehyde sensing mechanisms from pristine ZnO. We demonstrate the formation of the p-n homojunction structure in Cu-ZnO@ZnO by using surface photovoltage and surface photovoltage transient measurements. In addition, the interfacial charge transfer kinetics of Cu-ZnO@ZnO and Cu₂O/Cu-ZnO@ZnO materials were investigated. The Cu₂O/Cu-ZnO@ZnO sample exhibits ultra-high sensitivity to low concentrations of HCHO, with theoretical limits as low as 124 ppb. Concurrently, the sample exhibited a favorable selective response to formaldehyde and long-term stability.

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.