Highly electron-depleted ZnO/ZnFe2O4/Au hollow meshes as an advanced material for gas sensing application
Highly electron-depleted ZnO/ZnFe2O4/Au hollow meshes as an advanced material for gas sensing application
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高电子耗尽的 ZnO/ZnFe2O4/Au 空心网作为气体传感应用的先进材料
DOI：
10.1016/j.snb.2019.126769
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发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Liu Yichun
中科院分区：
文献类型：
--
作者：
Li Xiaowei;Han Chaohan;Lu Dongxiao;Shao Changlu;Li Xinghua;Liu Yichun
气敏材料的尺寸对气敏元件的性能有很大影响。本论文采用静电纺丝、原子层沉积和室温溶液反应相结合的方法，制备了尺寸可控的三组分氧化锌/铁酸锌/金纳米颗粒。所制备的氧化锌/铁酸锌/金纳米颗粒具有均匀的纳米管骨架(˜50 nm)、超薄的铁酸锌纳米片(˜10 nm)和均匀分散的金纳米颗粒。为了验证这种超细纳米材料的优越性，比较了由纯氧化锌、氧化锌/氧化锌和氧化锌/氧化锌/金制得的气敏元件的传感性能。测试结果表明，与其他两种参考材料相比，基于ZnO/ZnFe2O4/Au纳米颗粒的传感器具有最高的传感响应、显著增强的选择性和更快的响应/恢复速度。与纯氧化锌相比，氧化锌/铁酸锌/金复合材料对丙酮的响应提高了约3倍，比纯氧化锌提高了5.5倍。气敏性能的提高与材料的小尺寸和界面异质结形成的高电子耗尽层以及金纳米粒子赋予的敏化效应密切相关。本研究显示了纳米氧化锌/铁酸锌/金在丙酮检测方面的巨大潜力，为合理设计高性能气敏元件提供了一种有前途的手段。
The size of sensing materials matters a lot to the performance of gas sensors. Herein, size-controlled three-component ZnO/ZnFe2O4/Au nanomeshes were elaborately prepared by combining electrospinning, atomic layer deposition and room-temperature solution reaction methods. The as-prepared ZnO/ZnFe2O4/Au is characterized by uniform ZnO nanotube skeletons (˜50 nm), ultrathin ZnFe2O4nanosheets (˜10 nm) and well-dispersed Au nanoparticles. To demonstrate the superiority of such ultrafine ZnO/ZnFe2O4/Au nanomeshes, a comparison of sensing performance between the gas sensors fabricated by pristine ZnO, ZnO/ZnFe2O4and ZnO/ZnFe2O4/Au was carried out. Results of the measurement evidence that the sensor based on ZnO/ZnFe2O4/Au nanomeshes exhibited the highest sensing response, significantly enhanced selectivity, and faster response/recover speed compared with the other two reference counterparts. The response of ZnO/ZnFe2O4/Au towards acetone was improved about 3-fold versus the ZnO/ZnFe2O4composites and 5.5-fold versus pristine ZnO. The enhanced gas sensing performance was found to be closely related to the highly electron-depleted layer derived from the small material size and the interfacial heterojunctions as well as the sensitization effect endowed by the Au nanoparticles. This study shows the great potential of ZnO/ZnFe2O4/Au nanomeshes on acetone detection and provides a promising mean for the rational design of high-performance gas sensor.
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