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首页> 外文期刊>Nanotechnology >Engineering SnO2 nanorods/ethylenediamine-modified graphene heterojunctions with selective adsorption and electronic structure modulation for ultrasensitive room-temperature NO2 detection
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Engineering SnO2 nanorods/ethylenediamine-modified graphene heterojunctions with selective adsorption and electronic structure modulation for ultrasensitive room-temperature NO2 detection

机译：工程SnO2纳米棒/乙二胺改性石墨烯异质结，具有选择性吸附和电子结构调制，用于超敏感室温NO2检测

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摘要

Ever-increasing concerns over air quality and the newly emerged internet of things (IoT) for future environmental monitoring are stimulating the development of ultrasensitive room-temperature gas sensors, especially for nitrogen dioxide (NO2), one of the most harmful air pollution species released round-the-clock from power plants and vehicle exhausts. Herein, tin dioxide nanorods/ethylenediamine-modified reduced graphene oxide (SnO2/EDA-rGO) heterojunctions with selective adsorption and electronic structure modulation were engineered for highly sensitive and selective detection of NO2 at room temperature. The modified EDA groups not only enable selective adsorption to significantly enrich NO2 molecules around the interface but also realize a favorable modulation of SnO2/EDA-rGO electronic structure by increasing the Fermi level of rGO, through which the sensing performance of NO2 is synergistically enhanced. The response of the SnO2/EDA-rGO sensor toward 1 ppm NO2 reaches 282%, which exceeds the corresponding SnO2/rGO sensor by a factor of 2.8. It also exhibits a low detection limit down to 100 ppb, enhanced selectivity, and rapid response/recovery kinetics. This approach to designing a novel heterojunction with significantly enhanced chemical and electric effects may shed light on the future engineering of gas-sensing materials.
机译：人们对空气质量的日益担忧以及未来环境监测中新出现的物联网（IoT）正在刺激超灵敏室温气体传感器的发展，尤其是二氧化氮（NO2），二氧化氮是发电厂和车辆尾气24小时释放的最有害的空气污染物种之一。本文设计了具有选择性吸附和电子结构调制的二氧化锡纳米棒/乙二胺修饰的还原氧化石墨烯（SnO2/EDA-rGO）异质结，用于在室温下对NO2进行高灵敏度和选择性检测。修饰的EDA基团不仅能够选择性吸附，显著富集界面附近的NO2分子，而且通过提高rGO的费米能级，实现了SnO2/EDA rGO电子结构的良好调制，从而协同提高了NO2的传感性能。SnO2/EDA rGO传感器对1 ppm NO2的响应达到282%，比相应的SnO2/rGO传感器高出2.8倍。它还表现出低检测限（低至100 ppb）、高选择性和快速响应/回收动力学。这种设计具有显著增强的化学和电效应的新型异质结的方法可能会为未来气敏材料的工程设计带来启示。

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  • 来源
    《Nanotechnology》 |2021年第15期|共10页
  • 作者

    Zheng Shengliang; Sun Jianyong; Hao Juanyuan; Sun Quan; Wan Peng; Li Yue; Zhou Xin; Yuan Ye; Zhang Xu; Wang You;

  • 作者单位

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Chem &

    Chem Engn Minist Ind &

    Informat Key Lab Crit Mat Technol New Energy Convers &

    Sto Harbin 150001 Peoples R China;

    Songshan Lake Mat Lab Dongguan 523808 Guangdong Peoples R China;

    Northwestern Univ Theoret &

    Appl Mech Program 2145 Sheridan Rd Evanston IL 60208 USA;

    Harbin Inst Technol Sch Mat Sci &

    Engn Harbin 150001 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    SnO2; graphene; ethylenediamine-functionalization; room-temperature sensor; NO2;

    机译：SnO2;石墨烯;乙二胺功能化;室温传感器;二号;

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