Isolated Fe Sites Mediated Construction of WO3 Homojunctions for Superior Electronic Sensors.

IF 9.1 1区 化学 Q1 CHEMISTRY, ANALYTICAL
Jiangbin Guo,Xianghong Liu,Xiao Chang,Wei Zheng,Nicola Pinna,Jun Zhang
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引用次数: 0

Abstract

Homojunctions, constructed by different crystal structures or phases of the same material, are widely used in electronic and energy devices. However, the straightforward construction of semiconductor homojunctions by solution methods has been challenging. Herein, as a proof-of-concept, we report an isolated Fe-atom induced growth of hexagonal WO3 on monoclinic WO3 by a facile solution process. This approach allows for easy modulation of the ratio of monoclinic to hexagonal phases simply by adjusting the Fe concentration, thereby tuning not only the surface reaction properties but also the electronic conductivity of the materials. As a result, an optimized hexagonal/monoclinic WO3 homojunction with 0.25 at. % Fe delivers significantly improved response (to 10 ppm of NO2) by a factor of 65, as well as excellent selectivity, repeatability, and a ppb-level detection of NO2. This work provides an efficient strategy for designing semiconductor homojunctions and sheds light on the structure-property relationship of homojunctions.
分离Fe位点介导的WO3同质结的构建
同质结是由同一材料的不同晶体结构或相构成的,广泛应用于电子和能源器件中。然而,用溶液法直接构建半导体同质结一直是一个挑战。在这里,作为一个概念证明,我们报告了一个孤立的铁原子诱导生长的六方WO3在单斜WO3上的易溶工艺。这种方法可以简单地通过调整铁浓度来调节单斜相与六方相的比例,从而不仅可以调节表面反应性质,还可以调节材料的电子导电性。结果表明,优化后的六方/单斜WO3异质结为0.25 at。% Fe提供显著改善的响应(10 ppm NO2)的65倍,以及出色的选择性,可重复性和ppb级的NO2检测。本研究为半导体同质结的设计提供了一种有效的策略,并揭示了同质结的结构-性能关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Sensors
ACS Sensors Chemical Engineering-Bioengineering
CiteScore
14.50
自引率
3.40%
发文量
372
期刊介绍: ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.
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