ZnO Nanoparticles/Reduced Graphene Oxide Bilayer Thin Films for Improved NH3-Sensing Performances at Room Temperature.
ZnO Nanoparticles/Reduced Graphene Oxide Bilayer Thin Films for Improved NH3-Sensing Performances at Room Temperature.
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DOI：
10.1186/s11671-016-1343-7
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发表时间：
2016-12
影响因子：
--
通讯作者：
Du X
中科院分区：
文献类型：
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作者：
Tai H;Yuan Z;Zheng W;Ye Z;Liu C;Du X
采用简单的喷涂工艺在金叉指电极上依次沉积ZnO纳米颗粒和氧化石墨烯（GO）薄膜，再通过热还原处理将其还原为ZnO/还原氧化石墨烯（rGO）双层薄膜，并用于室温下氨气（NH3）检测。通过紫外-可见吸收光谱和X射线光电子能谱（XPS）分析确定了rGO的存在，并且ZnO纳米颗粒与rGO纳米片之间可能形成了粘附。比较了纯rGO膜和不同GO喷涂量的ZnO/rGO双层膜的NH3气敏性能。结果表明，ZnO/rGO薄膜传感器具有较好的响应特性，GO的最佳加入量为1.5ml。此外，最佳的ZnO/rGO薄膜传感器表现出良好的可逆性和快速的响应/恢复率在10-50 ppm的检测范围内。同时，该传感器对NH3也表现出良好的重复性和选择性。但是，水分子对传感器的干扰是不可消除的，在进一步的工作中需要研究一些技术来消除水分的影响。NH3传感特性的显著增强被推测归因于ZnO纳米颗粒膜的支撑作用和ZnO与rGO之间的界面处的积累异质结。因此，所提出的ZnO/rGO双层薄膜传感器可能为高性能NH3传感应用提供了希望。
ZnO nanoparticles and graphene oxide (GO) thin film were deposited on gold interdigital electrodes (IDEs) in sequence via simple spraying process, which was further restored to ZnO/reduced graphene oxide (rGO) bilayer thin film by the thermal reduction treatment and employed for ammonia (NH3) detection at room temperature. rGO was identified by UV-vis absorption spectra and X-ray photoelectron spectroscope (XPS) analyses, and the adhesion between ZnO nanoparticles and rGO nanosheets might also be formed. The NH3-sensing performances of pure rGO film and ZnO/rGO bilayer films with different sprayed GO amounts were compared. The results showed that ZnO/rGO film sensors exhibited enhanced response properties, and the optimal GO amount of 1.5 ml was achieved. Furthermore, the optimal ZnO/rGO film sensor showed an excellent reversibility and fast response/recovery rate within the detection range of 10–50 ppm. Meanwhile, the sensor also displayed good repeatability and selectivity to NH3. However, the interference of water molecules on the prepared sensor is non-ignorable; some techniques should be researched to eliminate the effect of moisture in the further work. The remarkably enhanced NH3-sensing characteristics were speculated to be attributed to both the supporting role of ZnO nanoparticles film and accumulation heterojunction at the interface between ZnO and rGO. Thus, the proposed ZnO/rGO bilayer thin film sensor might give a promise for high-performance NH3-sensing applications.