摘要:
为研究铂-全氟磺酸(Pt-PFSA)复合材料的传感特性, 首先, 测试了在阶跃激励和正弦激励下, Pt-PFSA复合材料的响应输出电压;然后, 采用化学镀方法, 将铂原子沉积在由Nafion溶液制备的0.4 mm厚的Nafion阳离子交换膜的两个表面上;最后, 考察了含水量对Pt-PFSA复合材料输出电压的影响, 预测了正弦激励下Pt-PFSA复合材料的传感性能, 进行了不同频率的正弦激励实验。 结果表明:采取保湿措施后, 含水量变化导致的输出电压降低幅度低于5%;在阶跃激励信号下, 当Pt-PFSA复合材料的应变为0.1%时, 输出电压具有时延;给出了Pt-PFSA复合材料的灵敏系数表达式, 当正弦激励信号频率为5.9 Hz时, 复合材料的灵敏系数为3.555 8 mV/0.2%, 得到的实验结果与预测吻合较好。研究为Pt-PFSA复合材料传感性能模型的建立奠定了基础。
Abstract:
In order to investigate the sensing properties of platinum-perfluorosulfonic acid (Pt-PFSA) composites, the response output voltage of Pt-PFSA composites under step excitation and sine wave excitation was measured firstly. Then, by means of chemical plating method, the platinum atomic was deposited on the two surfaces of Nafion cation exchange membranes manufactured by Nafion solution whose thickness was 0.4 mm. Finally, the effects of water content on the output voltage of Pt-PFSA composites were investigated, the sensing performances of Pt-PFSA composites under sine excitation were predicted and the sine excitation experiments of different frequencies were conducted. The results show that after the adoption of moisturizing treatment, the reduction of output voltage caused by water content change is lower than 5%. Under the step excitation signal, when the strain of Pt-PFSA composites is 0.1%, output voltage has time delay. The sensitivity coefficient expression of Pt-PFSA composites is given, and the sensitivity coefficient of composites is 3.555 8 mV/0.2% when the signal frequency of sine wave excitation is 5.9 Hz. The obtained experiment results agree well with the predictions. The research lay the foundation of the sensing performance model establishment for Pt-PFSA composites.
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