Detection of femtomolar concentrations of HF using an SiO2 microcantilever
Detection of femtomolar concentrations of HF using an SiO2 microcantilever
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DOI：
10.1021/ac035140g
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发表时间：
2004-05-01
影响因子：
7.4
通讯作者：
Thundat, T
中科院分区：
文献类型：
--
作者：
Tang, YJ;Fang, J;Thundat, T
飞摩尔浓度的氟化氢，神经毒剂的分解成分，使用SiO2微悬臂梁检测。由于HF与SiO2的反应，微悬臂梁发生弯曲。随着HF浓度的增加，微悬臂梁的挠度增大。其他酸，如盐酸，对悬臂梁的偏转没有影响。讨论了反应诱导弯曲的机理以及微悬臂梁的挠曲与HF浓度的关系。还研究了市售硅悬臂梁响应HF的偏转，并将其响应与SiO2悬臂梁的响应进行了比较。硅悬臂梁的弯曲幅度和灵敏度要小得多。
Femtomolar concentrations of hydrogen fluoride, a decomposition component of nerve agents, were detected using a SiO2 microcantilever. The microcantilever underwent bending due to the reaction of HF with SiO2. The microcantilever deflection increased as the concentration of HF increased. Other acids, such as HCl, had no effect on the deflection of the cantilever. The mechanism of reaction-induced bending and the correlation of microcantilever deflection with the HF concentration are discussed. The deflection in response to HF of a commercially available silicon cantilever was also studied, and its response was compared with that of the SiO2 cantilever. Much less bending amplitude and sensitivity were observed for the silicon cantilever.