Zhu Chonghui, Zhou Tingting, Xia Hong, Zhang Tong
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Nanomaterials (Basel). 2023 Mar 24;13(7):1158. doi: 10.3390/nano13071158.
Gas sensors have played a critical role in healthcare, atmospheric environmental monitoring, military applications and so on. In particular, flexible sensing devices are of great interest, benefitting from flexibility and wearability. However, developing flexible gas sensors with a high sensitivity, great stability and workability is still challenging. In this work, multi-walled carbon nanotubes (MWCNTs) were grown on polydimethylsiloxane (PDMS) films, which were further modified with polyaniline (PANI) using a simple chemical oxidation synthesis. The superior flexibility of the PANI-MWCNTs/PDMS film enabled a stable initial resistance value, even under bending conditions. The flexible sensor showed excellent NH sensing performances, including a high response (11.8 ± 0.2 for 40 ppm of NH) and a low limit of detection (10 ppb) at room temperature. Moreover, the effect of a humid environment on the NH sensing performances was investigated. The results show that the response of the sensor is enhanced under high humidity conditions because water molecules can promote the adsorption of NH on the PANI-MWCNTs/PDMS films. In addition, the PANI-MWCNTs/PDMS film sensor had the abilities of detecting NH in the simulated breath of patients with kidney disease and the freshness of shrimp. These above results reveal the potential application of the PANI-MWCNTs/PDMS sensor for monitoring NH in human breath and food.
气体传感器在医疗保健、大气环境监测、军事应用等领域发挥了关键作用。特别是，柔性传感设备因其柔韧性和可穿戴性而备受关注。然而，开发具有高灵敏度、高稳定性和可操作性的柔性气体传感器仍然具有挑战性。在这项工作中，多壁碳纳米管（MWCNTs）生长在聚二甲基硅氧烷（PDMS）薄膜上，然后使用简单的化学氧化合成方法用聚苯胺（PANI）对其进行进一步改性。PANI-MWCNTs/PDMS薄膜具有优异的柔韧性，即使在弯曲条件下也能保持稳定的初始电阻值。该柔性传感器表现出优异的氨气传感性能，包括在室温下对40 ppm氨气的高响应（11.8±0.2）和低检测限（10 ppb）。此外，还研究了潮湿环境对氨气传感性能的影响。结果表明，在高湿度条件下传感器的响应增强，因为水分子可以促进氨气在PANI-MWCNTs/PDMS薄膜上的吸附。此外，PANI-MWCNTs/PDMS薄膜传感器具有检测肾病患者模拟呼吸中的氨气以及虾的新鲜度的能力。上述结果揭示了PANI-MWCNTs/PDMS传感器在监测人体呼吸和食物中的氨气方面的潜在应用。
