Enhanced sensitivity of SAW gas sensor coated molecularly imprinted polymer incorporating high frequency stability oscillator
Enhanced sensitivity of SAW gas sensor coated molecularly imprinted polymer incorporating high frequency stability oscillator
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DOI：
10.1016/j.snb.2007.02.037
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发表时间：
2007-08-08
影响因子：
8.4
通讯作者：
Yong, Pan
中科院分区：
文献类型：
--
作者：
Wen, Wang;He, Shitang;Yong, Pan
本文提出了一种300 MHz的表面声波（SAW）气体传感器涂覆分子印迹聚合物与一种新的SAW振荡器具有高频率稳定性。在ST-X石英基片上制作了具有低插入损耗（小于12 dB）和单模选择能力的SAW延迟线作为振荡器元件。分别采用电极宽度控制单相单向换能器（EWC/SPUDT）结构和梳状换能器结构来实现SAW器件的最小插入损耗和单模选择。在制造之前，进行模式耦合（COM）模拟以预测器件性能。实测频率响应S-12与仿真结果吻合较好。详细研究了振荡电路系统温度漂移对所制作的振荡器频率稳定度的影响。典型的短期频率稳定性（1小时）的类似于0.06 ppm（类似于20 Hz）的制造300 MHz的SAW振荡器，在实验室环境中观察到温度控制。以邻苯二胺（o-PD）为功能单体，沙林酸为分子模板，采用循环伏安法（CV）共聚制备了10 nm分子印迹聚合物（MIP），并将其应用于DMMP的气敏传感器。DMMP浓度在1-100 mg/m3范围内的检测灵敏度与96 Hz/mg/m3相似，阈值检测限高达0.5 mg/m3。D 2007 Elsevier B. V.保留所有权利。
This paper presents a 300 MHz surface acoustic wave (SAW) gas sensor coated molecularly imprinted polymer incorporating a novel SAW oscillator with high frequency stability. A SAW delay line on ST-X quartz substrate with low insertion loss (less than 12 dB) and single mode selection capability was fabricated as the oscillator element. Electrode width control single phase unidirectional transducer (EWC/SPUDT) configuration and comb transducer were used to structure the SAW device to minimize the insertion loss and accomplish the single mode selection, respectively. Prior to fabrication, coupling of modes (COM) simulation was performed to predict device performance. The measured frequency response S-12 showed a good agreement with simulated results. The effect of oscillator circuit system temperature shift upon frequency stability of the fabricated oscillator was studied in detail. Typical short-term frequency stability (1 h) of similar to 0.06 ppm (similar to 20 Hz) for the fabricated 300 MHz SAW oscillator was observed in a laboratory environment with temperature control. The oscillator was successfully applied to gas sensor coated 10 nm molecularly imprinted polymer (MIP) as sensor material for dimethyl-methyl-phosphonate (DMMP), and the MIP was prepared using o-phenylenediamine (o-PD) as a functional monomer, Sarin acid as a molecular template and co-polymerized using cyclic voltammetry (CV). The sensitivity for DMMP concentrations detection in a range of 1-100 mg/m(3) was evaluated as similar to 96 Hz/mg/m(3), and the threshold detection limit was up to 0.5 mg/m(3). D 2007 Elsevier B.V. All rights reserved.