Zhou Yong, Zhang Ruijie, She Xiaopeng, Li Jing, Zhao Hongchao, Wang Yanjie, Chen Yi, Xie Lei, Zou Cheng, Li Xian
Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Innovative Drug Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, People's Republic of China.
ACS Appl Mater Interfaces. 2023 Nov 22;15(46):53802-53814. doi: 10.1021/acsami.3c10736. Epub 2023 Nov 7.
As a typical representative of conductive polymers (CPs), poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT:PSS) is intensively employed for chemiresistive ammonia (NH) sensing on account of its favorable aqueous solubility, benign environmental stability, and outstanding room-temperature conductivity; however, it is severely plagued by low sensitivity and sluggish reaction kinetics. To circumvent these limitations, the guest-alkalized cellulose nanofibers (AC) were introduced into the host PEDOT:PSS matrix by the layer-by-layer spraying assembly method (LBLSA) in this work. The componential proportion-optimized PEDOT:PSS/AC/PEDOT:PSS (P/AC/P) sensor delivered a large sensitivity of 20.2%/ppm within 0.1-3 ppm of NH at 21 °C@26% RH, an experimental limit of detection (LoD) as low as 30 ppb, a high response of 18.1%, and a short response/recovery times (4.8/4.0 s) toward 1 ppm of NH, which ranked among the best cases thus far. Also, excellent repeatability and long-term stability and selectivity were demonstrated. Meanwhile, the flexible P/AC/P sensors worked well under various bending angles and bending times. This work combines a green material system and a facile film deposition method to overcome the liquid dispersion incompatibility when preparing a multicomponent mixture for swift trace NH detection. The universality and extensibility of this methodology endow a broad prospect in the field of future wearable optoelectronic systems.
作为导电聚合物（CPs）的典型代表，聚（3,4 - 亚乙二氧基噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）因其良好的水溶性、优异的环境稳定性和出色的室温导电性，被广泛用于化学电阻式氨（NH₃）传感；然而，它受到低灵敏度和缓慢反应动力学的严重困扰。为了克服这些限制，本工作通过层层喷涂组装法（LBLSA）将客体碱化纤维素纳米纤维（AC）引入主体PEDOT:PSS基质中。成分比例优化后的PEDOT:PSS/AC/PEDOT:PSS（P/AC/P）传感器在21°C和26%相对湿度下，对0.1 - 3 ppm的NH₃具有20.2%/ppm的高灵敏度，实验检测限低至30 ppb，对1 ppm NH₃的响应率高达18.1%，响应/恢复时间短（4.8/4.0 s），这些性能在目前已报道的案例中名列前茅。此外，该传感器还表现出优异的重复性、长期稳定性和选择性。同时，柔性P/AC/P传感器在各种弯曲角度和弯曲次数下均能正常工作。本工作结合了绿色材料体系和简便的薄膜沉积方法，克服了制备用于快速痕量NH₃检测的多组分混合物时的液体分散不相容性。该方法的通用性和可扩展性为未来可穿戴光电系统领域带来了广阔的前景。
