SnO/SnO2 heterojunction: an alternative candidate for sensing NO2 with fast response at room temperature

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Frontiers of Materials Science Pub Date : 2022-07-27 DOI:10.1007/s11706-022-0609-5

Pengtao Wang, Wanyin Ge, Xiaohua Jia, Jingtao Huang, Xinmeng Zhang, Jing Lu

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引用次数: 2

Abstract

The SnO₂-based family is a traditional but important gas-sensitive material. However, the requirement for high working temperature limits its practical application. Much work has been done to explore ways to improve its gas-sensing performance at room temperature (RT). For this report, SnO₂, SnO, and SnO/SnO₂ heterojunction was successfully synthesized by a facile hydrothermal combined with subsequent calcination. Pure SnO₂ requires a high operating temperature (145 °C), while SnO/SnO₂ heterojunction exhibits an excellent performance for sensing NO₂ at RT. Moreover, SnO/SnO₂ exhibits a fast response, of 32 s, to 50 ppm NO₂ at RT (27 °C), which is much faster than that of SnO (139 s). The superior sensing properties of SnO/SnO₂ heterojunction are attributed to the unique hierarchical structures, large number of adsorption sites, and enhanced electron transport. Our results show that SnO/SnO₂ heterojunction can be used as a promising high-performance NO₂ sensitive material at RT.

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SnO/SnO2异质结：一种在室温下具有快速响应的NO2传感候选材料

sno2基系列是一种传统但重要的气敏材料。然而，对高工作温度的要求限制了其实际应用。为了提高其室温气敏性能，人们做了大量的工作。在本报告中，通过简单的水热结合随后的煅烧，成功地合成了SnO2、SnO和SnO/SnO2异质结。纯SnO2需要较高的工作温度(145°C)，而SnO/SnO2异质结在室温下表现出优异的NO2传感性能。此外，SnO/SnO2在室温(27°C)下对50 ppm NO2的响应速度为32 s，远快于SnO (139 s)。SnO/SnO2异质结优异的传感性能归因于其独特的层次结构、大量的吸附位点和增强的电子传递。结果表明，SnO/SnO2异质结可以作为一种很有前途的高性能NO2敏感材料。

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来源期刊

Frontiers of Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.20

自引率

3.70%

发文量

515

期刊介绍： Frontiers of Materials Science is a peer-reviewed international journal that publishes high quality reviews/mini-reviews, full-length research papers, and short Communications recording the latest pioneering studies on all aspects of materials science. It aims at providing a forum to promote communication and exchange between scientists in the worldwide materials science community. The subjects are seen from international and interdisciplinary perspectives covering areas including (but not limited to): Biomaterials including biomimetics and biomineralization; Nano materials; Polymers and composites; New metallic materials; Advanced ceramics; Materials modeling and computation; Frontier materials synthesis and characterization; Novel methods for materials manufacturing; Materials performance; Materials applications in energy, information and biotechnology.