Directional, upward transport of liquid alone a flexible diode. 1 mol/L NaOH solution was used in the test. 1 mol/L NaOH solution is a strong etchant to silicon, but it will not damage the polymer diode shown here. Moreover, as opposed to silicon diode, the polymer diode is flexible and transparent.
Wanbo Li, Miao Yu, Jing Sun, Kentaro Mochizuki, Siyu Chen, Huanxi Zheng, Jiaqian Li, Shuhuai Yao, Hongkai Wu, Beng S. Ong, Satoshi Kawata, Zuankai Wang, and Kangning Ren
PNAS. 2019. 116:23909-23914 DOI: 10.1073/pnas.1915332116