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首页> 外文期刊>RSC Advances >Hydrothermal synthesis of nanostructured flower-like Ni(OH)(2) particles and their excellent sensing performance towards low concentration HCN gas
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Hydrothermal synthesis of nanostructured flower-like Ni(OH)(2) particles and their excellent sensing performance towards low concentration HCN gas

机译：纳米结构花状Ni（OH）（2）粒子的水热合成及其对低浓度HCN气体的优异传感性能

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摘要

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 (mu g ppm)(-1), nearly 40-fold as high as previous reports. The high sensitivity is attributed to its high specific surface area (61 m(2) 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 (Delta F) 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.
机译：通过水热途径合成具有明确的花状形态的分层结构的Ni（OH）（2）颗粒。发现SDBS / Ni的摩尔比，水热温度和反应时间对所得产物的尺寸和形态具有深远的影响。这些分层结构的花状Ni（OH）（2）被用于石英晶体微天平谐振器上以进行HCN感测。花状Ni（OH）（2）修饰的QCM谐振器表现出出色的感测性能。花状Ni（OH）（2）修饰的QCM谐振器的灵敏度已达到5.14 Hz（μg ppm）（-1），几乎是以前报道的40倍。高灵敏度归因于其高比表面积（61 m（2）g（-1）），特殊的形态，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制。相对湿度的影响表明传感器对相对湿度的耐受性很高。响应信号（Delta F）和HCN浓度之间的完美线性关系，以及对低浓度HCN的快速灵敏响应以及高选择性，为这些Ni（OH）（2）修饰的QCM谐振器在痕量检测中显示了广阔的前景气态HCN。

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