UV-activated high-performance formaldehyde gas sensor based on P25/ZnO microspheres

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research Pub Date : 2024-09-11 DOI:10.1557/s43578-024-01440-3

Huibin Shi, Xiaosong Yang, Yibing Liu, Xiaoru Huang, Xinyang Du, Shuo Li, Weiguo Xu

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Abstract

Implementing sensitive and fast formaldehyde (HCHO) sensing at room temperature is still in extreme demand for practical indoor air quality monitoring. Herein, we synthesized P25/ZnO sensing materials for detecting low-concentration HCHO at room temperature. The sensing mechanism based on the P25/ZnO heterojunction was analyzed by the surface photovoltage (SPV), transient photovoltage (TPV), and X-ray photoelectron spectroscopy (XPS) results. Based on the P25/ZnO heterojunction, the obtained 1% P25/ZnO has the highest response among the synthesized sensing materials. The response of 1% P25/ZnO sensor materials to 0.9ppm and 19.1ppm HCHO reaches 44.85% and 255.42%, respectively, which is 21 and 20 times that of ZnO sensor materials (0.9ppm ~ 2.16%, 19.1ppm ~ 12.64%). Furthermore, the detection limit can be as low as 82 ppb under 360 nm light at room temperature. The selectivity, long-term stability, and repeatability of the obtained sensors at room temperature were also revealed.

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基于 P25/ZnO 微球的紫外线激活型高性能甲醛气体传感器

在室温下实现灵敏、快速的甲醛（HCHO）传感仍是实用室内空气质量监测的迫切需求。在此，我们合成了用于在室温下检测低浓度 HCHO 的 P25/ZnO 传感材料。通过表面光电压（SPV）、瞬态光电压（TPV）和 X 射线光电子能谱（XPS）结果分析了基于 P25/ZnO 异质结的传感机制。从 P25/ZnO 异质结来看，在合成的传感材料中，1% P25/ZnO 的响应最高。1% P25/ZnO 传感器材料对 0.9ppm 和 19.1ppm HCHO 的响应分别达到 44.85% 和 255.42%，是 ZnO 传感器材料（0.9ppm ~ 2.16%，19.1ppm ~ 12.64%）的 21 倍和 20 倍。此外，在室温下 360 纳米光照条件下，检测限可低至 82 ppb。此外，还揭示了所获传感器在室温下的选择性、长期稳定性和重复性。

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来源期刊

Journal of Materials Research 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.70%

发文量

362

审稿时长

2.8 months

期刊介绍： Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory