Y. P. Wen, X. M. Duan, J. K. Xu, et al. One-step electrosynthesis of poly(3,4-ethylenedioxy-thiophene)-ethylsulfate matrix for fa- bricating vitamin C electrochemical biosensor and its determina- tion in commercial juices. Chinese Journal of Polymer Science, 2012, 30(3): 460-469.