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Enhanced Blocking Effect: A New Strategy to Improve the NO2 Sensing Performance of Ti3C2Tx by γ-Poly(l-glutamic acid) Modification
ACS Sensors ( IF 8.2 ) Pub Date : 2021-06-29 , DOI: 10.1021/acssensors.1c00132
Qiuni Zhao 1 , Deming Sun 2 , Si Wang 1 , Zaihua Duan 1 , Zhen Yuan 1 , Guangfen Wei 2 , Jian-Long Xu 3 , Huiling Tai 1 , Yadong Jiang 1
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Titanium carbide (Ti3C2Tx) with a distinctive structure, abundant surface chemical groups, and good electrical conductivity has shown great potential in fabricating superior gas sensors, but several challenges, such as low response kinetics, poor reversibility, and serious baseline drift, still remain. In this work, γ-poly(l-glutamic acid) (γ-PGA) with a blocking effect is exploited to modify Ti3C2Tx, thereby stimulating the positive response behavior of Ti3C2Tx and improving its gas sensing performance. On account of the unique synergetic interaction between Ti3C2Tx and γ-PGA, the response of the flexible Ti3C2Tx/γ-PGA gas sensor to 50 ppm NO2has been improved to a large extent (average 1127.3%), which is 85 times that of Ti3C2Tx (only 13.2%). Moreover, the as-fabricated Ti3C2Tx/γ-PGA sensor not only exhibits a shorter response/recovery time (average 43.4/3 s) compared with the Ti3C2Tx-based sensor (∼18.5/18.3 min) but also shows good reversibility and repeatability (relative standard deviation (RSD) <1%) at room temperature within 50% relative humidity (RH). The improved gas sensing properties of the Ti3C2Tx/γ-PGA sensor can be attributed to the enhancement of effective adsorption and the blocking effect assisted by water molecules. Furthermore, the gas sensing response of the Ti3C2Tx/γ-PGA sensor is studied at different RHs, and humidity compensation of the sensor is carried out using the multiple regression method. This work demonstrates a novel strategy to enhance the gas sensing properties of Ti3C2Tx by γ-PGA modification and provides a new way to realize highly responsive gas detection at room temperature.

中文翻译:

增强阻断效果:一种通过γ-聚(l-谷氨酸)改性提高 Ti3C2Tx 对 NO2 传感性能的新策略

碳化钛 (Ti 3 C 2 T x ) 具有独特的结构、丰富的表面化学基团和良好的导电性,在制造优异的气体传感器方面显示出巨大的潜力,但存在响应动力学低、可逆性差和严重基线等几个挑战漂泊,依旧。在这项工作中,γ -聚(谷氨酸)与阻挡效果(γ-PGA)被利用来修改的Ti 3 c ^ 2 Ť X,从而刺激的Ti的积极响应行为3 c ^ 2 Ť X和改善其气体传感性能。由于 Ti 3之间独特的协同作用C 2 T x和γ-PGA,柔性Ti 3 C 2 T x /γ-PGA 气体传感器对50 ppm NO 2的响应得到了很大程度的提高(平均1127.3%),是柔性Ti 3 C 2 T x /γ-PGA气体传感器的85倍Ti 3 C 2 T x (仅13.2%)。此外,作为制造的钛3 c ^ 2 Ť X /γ-PGA传感器不仅表现出与Ti相比更短的响应/恢复时间(平均43.4 / 3秒)3 c ^ 2 Ť X基于传感器(~18.5/18.3 分钟),但在室温 50% 相对湿度 (RH) 内也表现出良好的可逆性和可重复性(相对标准偏差 (RSD) <1%)。Ti 3 C 2 T x /γ-PGA 传感器改善的气敏性能可归因于有效吸附的增强和水分子辅助的阻塞效应。此外,研究了Ti 3 C 2 T x /γ-PGA 传感器在不同相对湿度下的气敏响应,并使用多元回归方法对传感器进行了湿度补偿。这项工作展示了一种提高 Ti 3 C 2 T气敏性能的新策略x通过 γ-PGA 改性,为实现室温下高响应气体检测提供了一种新方法。
更新日期:2021-08-27
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