{"title":"Isolated Fe Sites Mediated Construction of WO3 Homojunctions for Superior Electronic Sensors.","authors":"Jiangbin Guo,Xianghong Liu,Xiao Chang,Wei Zheng,Nicola Pinna,Jun Zhang","doi":"10.1021/acssensors.5c01532","DOIUrl":null,"url":null,"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.","PeriodicalId":24,"journal":{"name":"ACS Sensors","volume":"88 1","pages":""},"PeriodicalIF":9.1000,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Sensors","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acssensors.5c01532","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
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.
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.