A high-performance flexible gas sensor based on self-assembled PANI-CeO2 nanocomposite thin film for trace-level NH3 detection at room temperature
A high-performance flexible gas sensor based on self-assembled PANI-CeO2 nanocomposite thin film for trace-level NH3 detection at room temperature
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DOI：
10.1016/j.snb.2017.12.022
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发表时间：
2018-05-15
影响因子：
8.4
通讯作者：
Jiang, Yadong
中科院分区：
文献类型：
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作者：
Liu, Chunhua;Tai, Huiling;Jiang, Yadong
采用原位自组装法在柔性聚酰亚胺（PI）基底上沉积聚苯胺-二氧化铈（PANI-CeO 2）纳米复合薄膜，制备了一种连续型柔性氨气（NH3）传感器。通过比较纯聚苯胺和聚苯胺-CeO 2纳米复合材料的形态、结构和化学特征，研究了CeO 2纳米粒子对苯胺聚合的影响，并对动态聚合过程进行了记录和研究。XPS分析结果表明，CeO 2纳米粒子与过硫酸铵（APS）的协同氧化作用使PANI-CeO 2纳米复合材料中PANI的质子化程度和氧化程度都得到了显著提高。同时，在室温下评价了纯聚苯胺和聚苯胺-CeO 2薄膜传感器的NH3敏感性能（与25 ℃相近），表明PANI-CeO 2薄膜传感器具有响应增强、恢复时间缩短、响应-浓度线性好、重现性好、选择性好、长期稳定性好超低的可检测浓度（16 ppb）和理论检测限（0.274 ppb），以及在500次弯曲/延伸循环后没有显著响应降低的突出的柔性。这可能与CeO 2纳米粒子的加入提高了聚苯胺的质子化程度，改善了聚苯胺的形貌以及p-n结的气敏增强效应有关。同时，由于PANI分子链的柔性结构，以及PANI-CeO 2薄膜良好的附着力和纳米力学性能，使得PANI-CeO 2薄膜具有很高的柔韧性。此外，还讨论和分析了相对湿度对PANI-CeO 2薄膜传感器传感性能的影响。因此，所提出的高性能柔性PANI-CeO 2薄膜传感器对于在室温下用于痕量级NH3检测的手持或可穿戴电子设备的应用具有很大的希望。(C)2017爱思唯尔B. V.保留所有权利。
A resistive-type flexible ammonia (NH3) sensor was proposed and developed in this work, which was prepared by depositing polyaniline-cerium dioxide (PANI-CeO2) nanocomposite thin film on flexible polyimide (PI) substrate through in-situ self-assembly method. The effect of CeO2 nanoparticles on the polymerization of aniline was studied by comparing the morphological, structural and chemical features of the pure PANI and PANI-CeO2 nanocomposite, and the dynamic polymerization processes were also recorded and investigated. In this process, an interesting phenomenon was found that the protonation and oxidation degrees of PANI in PANI-CeO2 nanocomposite were improved significantly according to the XPS spectra analysis, which should be ascribed to the synergetic oxidation of CeO2 nanoparticles and ammonium persulfate (APS). Meanwhile, the NH3-sensing performances of the pure PANI and PANI-CeO2 film sensors were evaluated at room temperature (similar to 25 degrees C), which showed that the PANI-CeO2 film sensor possessed enhanced response, reduced recovery time, perfect response-concentration linearity, good reproducibility, splendid selectivity, remarkable long-term stability, ultra-low detectable concentration (16 ppb) and theoretical detection limit (0.274 ppb), and outstanding flexibility without significant response decrease after 500 bending/extending cycles. It was speculated that the excellent sensing performances should probably benefit from the gas-sensing enhancement effect of p-n junction, the improved protonation degree and modified morphology of PANI by the addiction of CeO2 nanoparticles. And, the high flexibility might originate from the flexible structure of PANI chains, and the good adhesion and nano-mechanical performance of PANI-CeO2 film. Besides, the effect of relative humidity on the sensing properties of PANI-CeO2 film sensor was also discussed and analyzed. Therefore, the proposed high-performance flexible PANI-CeO2 thin film sensor holds great promise for application into hand-held or wearable electronic devices for trace-level NH3 detection at room temperature. (C) 2017 Elsevier B.V. All rights reserved.