Cross-Linked Gold-Nanoparticle Membrane Resonators as Microelectromechanical Vapor Sensors
Cross-Linked Gold-Nanoparticle Membrane Resonators as Microelectromechanical Vapor Sensors
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DOI：
10.1021/acssensors.6b00831
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发表时间：
2017-04-01
期刊：
影响因子：
8.9
通讯作者：
Vossmeyer, Tobias
中科院分区：
文献类型：
--
作者：
Schlicke, Hendrik;Behrens, Malte;Vossmeyer, Tobias
我们报告了一种检测挥发性化合物的新方法，该方法采用静电驱动鼓面谐振器作为传感元件。谐振器是基于烷二硫醇交联金纳米颗粒（GNPs）的独立膜，它能够从气相吸收分析物。在减压下，连续监测谐振器的基频共振频率，同时装置暴露于甲苯、4-甲基戊烷-2- 1、1-丙醇和水的不同分压下。测量结果显示，当将传感器暴露在分压为20 Pa的甲苯蒸气中时，可产生高达10 kHz的强烈可逆频移，即约为基频谐振频率的5%。由于这种强烈的转变不能完全由膜中的质量吸收来解释，我们的研究结果表明，分析物的吸收对独立式GNP膜的预应力有显著影响。因此，我们的研究结果指出了设计高灵敏度谐振器的可能性，该谐振器利用吸附诱导的膜预应力变化作为主要的转导机制。
We report a novel approach for the detection of volatile compounds employing electrostatically driven drumhead resonators as sensing elements. The resonators are based on freestanding membranes of alkanedithiol cross-linked gold nanoparticles (GNPs), which are able to sorb analytes from the gas phase. Under reduced pressure, the fundamental resonance frequency of a resonator is continuously monitored while the device is exposed to varying partial pressures of toluene, 4-methylpentan-2-one, 1-propanol, and water. The measurements reveal a strong, reversible frequency shift of up to similar to 10 kHz, i.e., similar to 5% of the fundamental resonance frequency, when exposing the sensor to toluene vapor with a partial pressure of similar to 20 Pa. As this strong shift cannot be explained exclusively by the mass uptake in the membrane, our results suggest a significant impact of analyte sorption on the pre-stress of the freestanding GNP membrane. Thus, our findings point to the possibility of designing highly sensitive resonators, which utilize sorption induced changes in the membranes pre-stress as primary transduction mechanism.