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Hierarchical layered double hydroxides with Ag nanoparticle modification for ethanol sensing

机译：具有Ag纳米粒子改性的等级分层双氢氧化物对乙醇感测

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摘要

Layered double hydroxides (LDHs) have recently been revealed to be promising in gas sensor applications due to their compositional flexibility and unique 2D-interlayer channel for gas diffusion and adsorption. This work demonstrates highly porous hierarchical LDHs containing Mg2+ and Al3+ (MgAl-LDHs) for ethanol sensing at room temperature. These MgAl-LDHs, with unique flower-like hierarchical structure and mesoporous interlayer, were synthesized hydrothermally using sodium dodecyl sulfate as soft template as well as intercalating agent. Further modification by discrete Ag nanoparticles (NPs) was achieved via an environmentally friendly glucose-reduction method to improve the gas-sensing response of the LDH-based sensor. It is found that the hierarchical MgAl-LDHs show potential in sensing ethanol gas with rapid dynamic characteristics at room temperature; their response magnitude towards ethanol can be enhanced significantly by Ag NP modification. The gas-response value of the Ag-modified MgAl-LDH sensor is about twice that of pristine MgAl-LDH sensors, towards 5-200 ppm ethanol at room temperature. Meanwhile, rapid response-recovery characteristics are achieved, with response and recovery times shorter than 10 and 50 s, respectively. The satisfactory sensing performance and remarkable response enhancement by Ag NP modification are demonstrated in terms of the unique microstructure of the hierarchical MgAl-LDHs and a constructed conductive effect model of Ag functionalized LDHs.
机译：最近透露了层状的双氢氧化物（LDHs）由于它们的组成柔性和用于气体扩散和吸附的独特的2D层间通道，在气体传感器应用中被揭示。这项工作表明含有镁离子和铝离子（镁铝-水滑石），用于感测乙醇在室温下高度多孔的分层的LDH。这些MGAL-LDH，具有独特的花状等级结构和介孔中间层，使用十二烷基硫酸钠作为软模板以及嵌入剂合成水热量。通过环保葡萄糖还原方法实现离散Ag纳米颗粒（NPS）的进一步改性，以改善基于LDH的传感器的气体传感响应。结果发现，等级MgAl -LDHs显示出在室温下具有快速动态特性的乙醇气体的电位;通过AG NP改性，可以显着提高朝乙醇的响应幅度。 Ag改性的MgAl -LDH传感器的气体响应值约为原始MgAl -LDH传感器的两倍，在室温下朝向5-200ppm乙醇。同时，响应和恢复时间分别达到快速响应恢复特性，分别短于10和50秒。通过Ag NGAL-LDH的独特微观结构和Ag官能化LDHs的独特微观结构来证明AG NP改性的令人满意的感测性能和显着反应增强。

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