Urea Detection of Electrochemical Transistor Sensors based on Polyanline (PANI)/MWCNT/Cotton Yarns
Yao Wang, Yao Wang, Yang Zhang, Yuedan Wang, Yuedan Wang, Rufeng Zhu, Yuanli Chen, Xue Liu, Xu Jia, Mufang Li, Dong Wang
Abstract
Abstract A cotton yarn biosensor based on electrochemical transistor functionalized with MWCNT and PANI was developed for the detection of urea. The transistors based on PANI/MWCNT/cotton yarns under optimized MWCNT concentration has been obtained, which exhibited high on/off current ratio, fast response time, and good operational stability. A transistor‐based urea sensor was prepared from PANI/MWCNT/cotton yarns, which could monitor urea in the 1 nM–1 mM linear range with the correlation coefficient of 0.9716. Furthermore, the sensor showed superior reproducibility and high specificity. The practical applications of the proposed sensor were also confirmed. These results indicate the flexible transistor can be used as an efficient platform for biological detection in body fluids.