Hydrothermal synthesis of nanostructured flower-like Ni(OH)2 particles and their excellent sensing performance towards low concentration HCN gas
Hydrothermal synthesis of nanostructured flower-like Ni(OH)2 particles and their excellent sensing performance towards low concentration HCN gas
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DOI：
10.1039/c5ra02742j
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发表时间：
2015-03
期刊：
影响因子：
3.9
通讯作者：
Mingzhen Hu;Junhui He;Mingqing Yang;Xiaochun Hu;Chunxiao Yan;Zhenxing Cheng
中科院分区：
文献类型：
--
作者：
Mingzhen Hu;Junhui He;Mingqing Yang;Xiaochun Hu;Chunxiao Yan;Zhenxing Cheng
采用水热法合成了具有花状形貌的分级结构Ni（OH）2粒子。SDBS/Ni的摩尔比、水热温度和反应时间对产物的尺寸和形貌有很大的影响。这些层次结构的花状Ni（OH）2采用石英晶体微天平谐振器HCN传感。花状Ni（OH）2修饰的QCM谐振器具有优异的传感性能。花状Ni（OH）2修饰的QCM谐振器的灵敏度达到了5.14 Hz（μg ppm）−1，几乎是之前报道的40倍。高灵敏度归因于其高比表面积（61 m2 g−1）、特殊形态，尤其是其表面结构。根据实验结果，提出了一种涉及表面空位及其对氧分子的吸附和活化的传感机理。相对湿度的影响表明传感器对相对湿度有很高的耐受性。响应信号（ΔF）与HCN浓度之间具有良好的线性关系，对低浓度HCN具有快速、灵敏的响应和高的选择性，表明Ni（OH）2修饰QCM谐振器在痕量气态HCN的检测中具有良好的应用前景。
Hierarchically structured Ni(OH)2 particles with a well-defined flower-like morphology were synthesized via a hydrothermal route. The molar ratio of SDBS/Ni, hydrothermal temperature and reaction time were found to have a profound influence on the size and morphology of the resulting products. These hierarchically structured flower-like Ni(OH)2 were employed on quartz crystal microbalance resonators for HCN sensing. The flower-like Ni(OH)2 modified QCM resonators exhibited excellent sensing performance. The sensitivity of flower-like Ni(OH)2 modified QCM resonators has reached 5.14 Hz (μg ppm)−1, nearly 40-fold as high as previous reports. The high sensitivity is attributed to its high specific surface area (61 m2 g−1), special morphology and especially to its surface structure. A sensing mechanism that involves surface vacancy sites and their adsorption and activation of oxygen molecules was proposed on the basis of experimental results. Effects of relative humidity show high tolerance of the sensors to relative humidity. The prefect linear relationship between response signal (ΔF) and HCN concentration, and a fast and sensitive response to low concentration HCN coupled with high selectivity show a promising future for these Ni(OH)2 modified QCM resonators in the detection of trace gaseous HCN.