Chemical sensor based on microfabricated wristwatch tuning forks
Chemical sensor based on microfabricated wristwatch tuning forks
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DOI：
10.1021/ac048320e
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发表时间：
2005-05-01
影响因子：
7.4
通讯作者：
Tao, NJ
中科院分区：
文献类型：
--
作者：
Ren, MH;Forzani, ES;Tao, NJ
我们在这里报告的化学传感器的基础上检测的机械响应的薄（类似于10 μ m）的聚合物线拉伸在两个尖头的手表石英音叉（QTF）。当叉被设置为振荡时，金属丝被两个尖头拉伸和压缩。当分析物分子吸附到聚合物线上/聚合物线中时，拉伸/压缩力发生变化，这由具有皮牛顿力灵敏度的QTF检测。具有不同聚合物线的此类传感器阵列用于同时检测多种分析物并改善模式识别。QTF的低成本（类似于10美分），以及可以驱动QTF阵列同时振荡并且用相同的电路检测它们的谐振频率，保证了用于检测各种化学蒸汽的高性能、低成本和便携式传感器。我们在这里展示了检测的部分每十亿水平的水，乙基硝基苯，和乙醇蒸气使用QTF阵列。
We report here a chemical sensor based on detecting the mechanical response of a thin (similar to 10-mu m) polymer wire stretched across the two prongs of a wristwatch quartz tuning fork (QTF). When the fork is set to oscillate, the wire is stretched and compressed by the two prongs. The stretching/compression force changes upon adsorption of analyte molecules onto/into the polymer wire, which is detected by the QTF with pico-Newton force sensitivity. An array of such sensors with different polymer wires is used for simultaneous detection of several analytes and for improvement of pattern recognition. The low cost (similar to 10 cent) of the QTF, together with that an array of QTFs can be driven to oscillate simultaneously and their resonance frequencies detected with the same circuit, promises a high performance, low cost, and portable sensor for detecting various chemical vapors. We demonstrate here detection of parts-per-billion-level water, ethylnitrobenzene, and ethanol vapors using the QTF arrays.