介孔碳/聚苯胺修饰电极的制备及其对Cu^(2+)的响应研究(英文)

Preparation of Ordered Mesoporous Carbon/Polyaniline Electrodes and as Electrochemical Sensors for Cu^(2+)

制备了一个新的电极-聚苯胺掺杂介孔碳修饰电极(PANI-MC),并且研究了电极的电化学性质。在介孔分子筛SBA-15的孔道中沉积蔗糖,然后在氮气的保护下,1200℃热裂解,生成孔道规则排列的介孔碳(MC);XRD、N2吸附-脱附、TEM等方法表征了介孔碳的结构,用SEM表征了PANI-MC修饰电极的形貌。结果表明:复合电极膜与修饰前的聚苯胺膜形貌不同,与介孔碳形貌相似,介孔碳纳米微粒的大小清洗可辨,长度大约为20~40μm。复合电极循环伏安结果显示:峰电位向负电位方向移动,这可能是因为介孔碳的孔道结构阻碍了离子的转移。同时,还研究了复合电极对Cu2+的相应,表明:电极对低浓度的Cu2+有很好的线性相应,可以作为Cu2+的感应器。

A new electrode,obtained by the dispersion of ordered mesoporous carbon（MC） nanoparticles onto polyaniline（PANI） was presented in this paper.Ordered mesoporous carbon was prepared by pyrolysis of sucrose filled in the mesoporous channels of SBA-15 at 1 200 ℃,and followed by dissolution of the silica matrix in hydrofluoric acid.The pore structure of the MC material was evaluated using XRD,nitrogen adsorption,TEM.SEM showed that PANI-MC films presented a wholy modified morphology when compared to PANI film.Electrochemical characterization indicated that the potential shift toward negative direction.This can be attributed to the porous feature of MC,which imposes resistance for ion migration in mesoporous.The deposition potential and time had been optimized for determination of Cu2＋ in aqueous solution.ASV analysis revealed that the new electrode presented a linear response to low concentrations of Cu2＋.Under optimized conditions,the current showed a linear dependence with concentration in the range 1.00 ×10^-8-1×10^-6 mol·L^-1.The detection limit was 6×10^-9 mol·L^-1.The results showed good reproducibility and stability.