A FlexibleWO(3)-Based pH Sensor Array for 2-D pH Monitoring Using CPLoP Technique

作者：Fu Yu Min; Pan Jia Chyi; Tsou Kun Lin; Cheng Yu Ting^*

来源：IEEE Electron Device Letters, 2018, 39(6): 881-884.

DOI：10.1109/LED.2018.2826013

• Flexible pH sensor
• WO3
• sensor array
• inkjet printing

In this letter, we demonstrate an inkjet-printed WO3-based pH sensor array using WO3/Ag and Ag/AgCl as working and reference electrodes, respectively, on a flexible polyimide substrate. Pre-treated by Tollen's reagent, the printed Ag lines as sensor interconnects can exhibit a denser microstructure with lower electrical resistivity. As a result, the WO3 nanoparticles can be well printed and sintered at 120 degrees C on the Ag lines as the working electrodes of the pH sensors. Experimental results show the sensitivity of the pH sensor to be as high as -24.4 mV/pH. The array comprising six pH sensors shows potential for real-time 2-D pH sensing applications.

• 出版日期2018-6