High-performance humidity sensor based on Ag-doped ZnGa2O4/ZnO composite nanofibers

RSC Applied Interfaces Pub Date : 2024-06-27 DOI:10.1039/D4LF00170B

Chunhua Sun, Wenjing Li, Ze Lv and Ying Guo

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Abstract

Ag-doped ZnGa₂O₄/ZnO composite nanofibers (ZG-Ag) were synthesized using electrostatic spinning followed by calcination. Compared to undoped ZnGa₂O₄/ZnO composite nanofibers (ZG), Ag-doped ZnGa₂O₄/ZnO composite variants exhibited superior room-temperature humidity sensing capabilities. Notably, the humidity-sensitive performance of the Ag-doped ZnGa₂O₄/ZnO composite nanofibers can be tuned by adjusting the Ag content, achieving a reliable wet hysteresis of 2.81% and a rapid response and recovery time of 1.5 and 2 seconds, respectively. The humidity sensing mechanism of the composites was also investigated. Compounding ZnO with ZnGa₂O₄ was found to mitigate the hysteresis issue, while the porous nanofiber structure and doping with Ag increased oxygen vacancies and conductivity. These enhancements collectively contributed to an improved sensitivity to water molecules.

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基于掺银 ZnGa2O4/ZnO 复合纳米纤维的高性能湿度传感器

利用静电纺丝和煅烧合成了掺银 ZnGa2O4/ZnO 复合纳米纤维（ZG-Ag）。与未掺杂的 ZnGa2O4/ZnO 复合纳米纤维（ZG）相比，掺杂了银的 ZnGa2O4/ZnO 复合变体表现出更出色的室温湿度传感能力。值得注意的是，掺银 ZnGa2O4/ZnO 复合纳米纤维的湿度感应性能可通过调节银的含量来调整，实现了 2.81% 的可靠湿滞后，以及分别为 1.5 秒和 2 秒的快速响应和恢复时间。此外，还研究了复合材料的湿度感应机制。研究发现，ZnO 与 ZnGa2O4 的复合可减轻滞后问题，而多孔纳米纤维结构和 Ag 掺杂则增加了氧空位和电导率。这些改进共同提高了对水分子的灵敏度。

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RSC Applied Interfaces

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