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Layered double hydroxide-oriented assembly by negatively charged graphene oxide for NO2 sensing at ppb level
New Journal of Chemistry ( IF 3.3 ) Pub Date : 2020-09-10 , DOI: 10.1039/d0nj03372c
Yuxiang Qin 1, 2, 3, 4, 5 , Ruling Zhao 1, 2, 3, 4 , Chenxiang Bai 1, 2, 3, 4
Affiliation  

Layered double hydroxides (LDHs) have been demonstrated to be promising gas-sensing materials because of their high specific surface area and unique layered structure. However, the general stacking and low conductivity make the LDHs insensitive in most cases towards rarefied gas exposure. In this work, we designed and hydrothermally prepared nanocomposites of LDHs/rGO (layered double hydroxides/reduced graphene oxide) based on electrostatic self-assembly. The as-formed nanocomposite with proper addition of GO shows loose arrangement of LDH nanoflakes on both sides of the highly conductive rGO instead of the stacked flower-like structure of pure LDHs. The unique microstructure, as well as the conductivity modulation by rGO, induces enhanced sensing performance of the LDHs/rGO nanocomposites compared with that of the pure ZnTi-LDHs. At room temperature, the sensor based on LDHs/rGO is responsive to rarefied NO2 low to 50 ppb and 4-fold enhancement in gas response is achieved upon 0.5–50 ppm NO2 exposure in comparison to that of the single ZnTi-LDHs sensor. Meanwhile, the LDHs/rGO sensors show near instantaneous response characteristics and good stability. The satisfactory sensing response of LDHs/rGO is analyzed in terms of the unique guided-assembly microstructure and the synergistic contributions on gas-sensing and conductivity properties of ZnTi-LDHs and rGO.

中文翻译:

带负电的氧化石墨烯的分层双氢氧化物定向组件,用于ppb级的NO2感测

层状双氢氧化物(LDHs)由于其高的比表面积和独特的层状结构,已被证明是有前途的气体传感材料。但是,一般的堆叠和低电导率使LDH在大多数情况下对稀薄气体暴露不敏感。在这项工作中,我们基于静电自组装设计并水热制备了LDHs / rGO(层状双氢氧化物/氧化石墨烯)的纳米复合材料。正确添加GO的纳米复合材料在高导电性rGO的两侧显示LDH纳米薄片的排列松散,而不是纯LDH的堆叠花状结构。与纯ZnTi-LDHs相比,独特的微观结构以及rGO的电导率调制可增强LDHs / rGO纳米复合材料的传感性能。与单个ZnTi-LDHs传感器相比,在0.5–50 ppm NO 2暴露下,可实现2低至50 ppb的气体响应和4倍的气体响应增强。同时,LDH / rGO传感器显示出接近瞬时的响应特性和良好的稳定性。根据独特的引导组件微观结构以及对ZnTi-LDHs和rGO的气敏性和电导率特性的协同贡献,分析了LDHs / rGO的令人满意的感测响应。
更新日期:2020-10-15
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