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首页> 外文期刊>Advanced Functional Materials >Heterogeneous, Porous 2D Oxide Sheets via Rapid Galvanic Replacement: Toward Superior HCHO Sensing Application
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Heterogeneous, Porous 2D Oxide Sheets via Rapid Galvanic Replacement: Toward Superior HCHO Sensing Application

机译：通过快速电置换实现非均质，多孔二维氧化板：朝着卓越的HCHO传感应用

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摘要

2D heterogeneous oxide nanosheets (NSs) have attracted much attention in various scientific fields owing to their exceptional physicochemical properties. However, the fabrication of 2D oxide NSs with abundant p-n interfaces and large amounts of mesopores is extremely challenging. Here, a facile synthesis of highly porous 2D heterogeneous oxide NSs (e.g., SnO2/CoOx) is suggested through a 2D oxide exfoliation approach combined with a fast galvanic replacement reaction (GRR). The ultrathin (<5 nm) layered CoOx NSs are simply prepared by ion-exchange exfoliation and a subsequent GRR process that induces a rapid phase transition from p-type CoOx to n-type SnO2 metal oxides (<10 min). The controlled GRR process enables the creation of heterogeneous SnO2/CoOx NSs consisting of small SnO2 grain sizes (<10 nm), high porosity, numerous heterojunctions, and sub-10 nm thickness, which are highly advantageous characteristics for chemiresistive sensors. Due to the advantage of these features, the porous SnO2/CoOx NSs exhibit an unparalleled HCHO-sensing performance (R-air/R-gas > 35 @ 5 ppm with a response speed of 9.34 s) with exceptional selectivity compared to that of the state-of-the-art metal oxide-based HCHO gas sensors.
机译：二维异质氧化物纳米片（NSs）由于其卓越的理化特性而在各个科学领域引起了广泛关注。但是，具有丰富的p-n界面和大量中孔的二维氧化物NS的制造极具挑战性。在此，建议通过二维氧化物剥落方法与快速电置换反应（GRR）结合，轻松合成高度多孔的2D异质氧化物NSs（例如SnO2 / CoOx）。只需通过离子交换剥离和随后的GRR工艺即可制备超薄（<5 nm）层状CoOx NS，该工艺会引起从p型CoOx到n型SnO2金属氧化物的快速相变（<10分钟）。受控的GRR工艺能够创建异质SnO2 / CoOx NS，它们由小SnO2晶粒尺寸（<10 nm），高孔隙率，许多异质结和低于10 nm的厚度组成，对于化学传感器来说是非常有利的特性。由于这些特性的优势，多孔SnO2 / CoOx NSs表现出无与伦比的HCHO感测性能（R空气/ R气体> 35 @ 5 ppm，响应速度为9.34 s），与传统方法相比具有卓越的选择性。最先进的基于金属氧化物的HCHO气体传感器。

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  • 来源
    《Advanced Functional Materials》 |2019年第42期|1903012.1-1903012.10|共10页
  • 作者

    Jang Ji-Soo; Lee Sang-Eun; Choi Seon-Jin; Koo Won-Tae; Kim Dong-Ha; Shin Hamin; Park Hee Jung; Kim Il-Doo;

  • 作者单位

    Korea Adv Inst Sci & Technol Dept Mat Sci & Engn 291 Daehak Ro Daejeon 305701 South Korea|Korea Adv Inst Sci & Technol KI Nanocentury Adv Nanosensor Res Ctr 291 Daehak Ro Daejeon 34141 South Korea;

    Dankook Univ Dept Mat Sci & Engn Cheonan 31116 Chungnam South Korea;

    Korea Adv Inst Sci & Technol Dept Mat Sci & Engn 291 Daehak Ro Daejeon 305701 South Korea|MIT Dept Chem 77 Massachusetts Ave Cambridge MA 02139 USA;

    Korea Adv Inst Sci & Technol KI Nanocentury Adv Nanosensor Res Ctr 291 Daehak Ro Daejeon 34141 South Korea;

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  • 正文语种 eng
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  • 关键词

    exfoliation; galvanic replacement; gas sensors; porosity;

    机译：去角质电更换气体传感器孔隙率;

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