An organic hydrogel film with micron-sized pillar array for real-time and indicator-free detection of Zn²⁺

Yu Chiang Chao, Yi Sa Huang, Hsin Ping Wang, Ssu Ming Fu, Chien Hao Huang, Yen Chun Liang, Wen Cheng Yang, Yu Sheng Huang, Gao Fong Chang, Hsiao Wen Zan, Hsin Fei Meng^*, Chen Hsiung Hung, Chien Chung Fu