Layered two-dimensional(2D)materials have garnered marvelous attention in diverse fields,including sensors,capacitors,nanocomposites and transistors,owing to their distinctive structural morphologies and superior phys...Layered two-dimensional(2D)materials have garnered marvelous attention in diverse fields,including sensors,capacitors,nanocomposites and transistors,owing to their distinctive structural morphologies and superior physicochemical properties.Recently,layered quasi-2D materials,especially layered bismuth oxyselenide(Bi2O2Se),are of particular interest,because of their different interlayer interactions from other layered 2D materials.On this basis,this material offers richer and more intriguing physics,including high electron mobility,sizeable bandgap,and remarkable thermal and chemical durability,rendering it an utterly prospective contender for use in advanced electronic and optoelectronic applications.Herein,this article reviews the recent advances related with Bi2O2Se.Initially,its structural characterization,band structure,and basic properties are briefly introduced.Further,the synthetic strategies for the preparation of Bi_(2)O_(2)Se are presented.Furthermore,the diverse applications of Bi2O2Se in the field of electronics and optoelectronics,photocatalytic,solar cells and sensing were summarized in detail.Ultimately,the challenges and future perspectives of Bi2O2Se are included.展开更多
Bismuth oxyselenide(Bi_(2)O_(2)Se),a novel quasi-two-dimensional charge-carrying semiconductor,is recognized as one of the most promising emerging platforms for next-generation semiconductor devices.Recent advancement...Bismuth oxyselenide(Bi_(2)O_(2)Se),a novel quasi-two-dimensional charge-carrying semiconductor,is recognized as one of the most promising emerging platforms for next-generation semiconductor devices.Recent advancements in the development of diverse Bi_(2)O_(2)Se heterojunctions have unveiled extensive potential applications in both electronics and optoelectronics.However,achieving an in-depth understanding of band alignment and particularly interface dynamics remains a significant challenge.In this study,we conduct a comprehensive experimental investigation into band alignment utilizing high-resolution X-ray photoelectron spectroscopy(HRXPS),while also thoroughly discussing the properties of interface states.Our findings reveal that ultrathin films of Bi_(2)O_(2)Se grown on SrTiO_(3)(with TiO_(2)(001)termination)exhibit Type-I(straddling gap)band alignment characterized by a valence band offset(VBO)of approximately 1.77±0.04 eV and a conduction band offset(CBO)around 0.68±0.04 eV.Notably,when accounting for the influence of interface states,the bands at the interface display a herringbone configuration due to substantial built-in electric fields,which markedly deviate from conventional band alignments.Thus,our results provide valuable insights for advancing high-efficiency electronic and optoelectronic devices,particularly those where charge transfer is highly sensitive to interface states.展开更多
The fast booming of wearable electronics provides great opportunities for intelligent gas detection with improved healthcare of mining workers,and a variety of gas sensors have been simultaneously developed.However,th...The fast booming of wearable electronics provides great opportunities for intelligent gas detection with improved healthcare of mining workers,and a variety of gas sensors have been simultaneously developed.However,these sensing systems are always limited to single gas detection and are highly susceptible to the inference of ubiquitous moisture,resulting in less accuracy in the analysis of gas compositions in real mining conditions.To address these challenges,we propose a synergistic strategy based on sensor integration and machine learning algorithms to realize precise NH_(3) and NO_(2) gas detections under real mining conditions.A wearable sensing array based on the graphene and polyaniline composite is developed to largely enhance the sensitivity and selectivity under mixed gas conditions.Further introduction of backpropagation neural network(BP-NN)and partial least squares(PLS)algorithms could improve the accuracy of gas identification and concentration prediction and settle the inference of moisture,realizing over 99%theoretical prediction level on NH_(3) and NO_(2) concentrations within a wide relative humidity range,showing great promise in real mining detection.As proof of concept,a wireless wearable bracelet,integrated with sensing arrays and machine-learning algorithms,is developed for wireless real-time warning of hazardous gases in mines under different humidity conditions.展开更多
基金NSFC of China,Grant/Award Numbers:52072059,11774044Foundation of Sichuan Excellent Young Talents,Grant/Award Number:2021JDJQ0015+1 种基金Fundamental Research Funds for the Central Universities,Grant/Award Number:ZYGX2020J023ARC Future Fellowship,Grant/Award Number:FT160100205。
文摘Layered two-dimensional(2D)materials have garnered marvelous attention in diverse fields,including sensors,capacitors,nanocomposites and transistors,owing to their distinctive structural morphologies and superior physicochemical properties.Recently,layered quasi-2D materials,especially layered bismuth oxyselenide(Bi2O2Se),are of particular interest,because of their different interlayer interactions from other layered 2D materials.On this basis,this material offers richer and more intriguing physics,including high electron mobility,sizeable bandgap,and remarkable thermal and chemical durability,rendering it an utterly prospective contender for use in advanced electronic and optoelectronic applications.Herein,this article reviews the recent advances related with Bi2O2Se.Initially,its structural characterization,band structure,and basic properties are briefly introduced.Further,the synthetic strategies for the preparation of Bi_(2)O_(2)Se are presented.Furthermore,the diverse applications of Bi2O2Se in the field of electronics and optoelectronics,photocatalytic,solar cells and sensing were summarized in detail.Ultimately,the challenges and future perspectives of Bi2O2Se are included.
基金supported by the National Natural Science Foundation of China(Nos.52072059,12304078,12274061 and 11774044)the Natural Science Foundation of Sichuan Province(No.2024NSFSC1384).
文摘Bismuth oxyselenide(Bi_(2)O_(2)Se),a novel quasi-two-dimensional charge-carrying semiconductor,is recognized as one of the most promising emerging platforms for next-generation semiconductor devices.Recent advancements in the development of diverse Bi_(2)O_(2)Se heterojunctions have unveiled extensive potential applications in both electronics and optoelectronics.However,achieving an in-depth understanding of band alignment and particularly interface dynamics remains a significant challenge.In this study,we conduct a comprehensive experimental investigation into band alignment utilizing high-resolution X-ray photoelectron spectroscopy(HRXPS),while also thoroughly discussing the properties of interface states.Our findings reveal that ultrathin films of Bi_(2)O_(2)Se grown on SrTiO_(3)(with TiO_(2)(001)termination)exhibit Type-I(straddling gap)band alignment characterized by a valence band offset(VBO)of approximately 1.77±0.04 eV and a conduction band offset(CBO)around 0.68±0.04 eV.Notably,when accounting for the influence of interface states,the bands at the interface display a herringbone configuration due to substantial built-in electric fields,which markedly deviate from conventional band alignments.Thus,our results provide valuable insights for advancing high-efficiency electronic and optoelectronic devices,particularly those where charge transfer is highly sensitive to interface states.
基金National Key Research and Development Program of China,Grant/Award Number:2022YFB3205500National Nature Science Foundation of China,Grant/Award Numbers:61833006,61831011+1 种基金Fundamental Research Funds for the Central UniversitiesMinistry of Education Academic Research Fund Tier 1,Grant/Award Number:A-0009304-00-00。
文摘The fast booming of wearable electronics provides great opportunities for intelligent gas detection with improved healthcare of mining workers,and a variety of gas sensors have been simultaneously developed.However,these sensing systems are always limited to single gas detection and are highly susceptible to the inference of ubiquitous moisture,resulting in less accuracy in the analysis of gas compositions in real mining conditions.To address these challenges,we propose a synergistic strategy based on sensor integration and machine learning algorithms to realize precise NH_(3) and NO_(2) gas detections under real mining conditions.A wearable sensing array based on the graphene and polyaniline composite is developed to largely enhance the sensitivity and selectivity under mixed gas conditions.Further introduction of backpropagation neural network(BP-NN)and partial least squares(PLS)algorithms could improve the accuracy of gas identification and concentration prediction and settle the inference of moisture,realizing over 99%theoretical prediction level on NH_(3) and NO_(2) concentrations within a wide relative humidity range,showing great promise in real mining detection.As proof of concept,a wireless wearable bracelet,integrated with sensing arrays and machine-learning algorithms,is developed for wireless real-time warning of hazardous gases in mines under different humidity conditions.
