离子液体/金纳米粒子自组装介孔材料及其增强的细胞色素c直接电化学(英文)

Room Temperature Ionic Liquid Templated Meso-Macroporous Material by Self-Assembled Giant Gold Nanoparticles and Its Enhancement on Room Temperature Ionic Liquid Templated Meso-Macroporous Material by Self-Assembled Giant Gold Nanoparticles and Its Enhance

室温离子液体作为一种软模板用来组装介孔材料,这种材料是由表面覆盖有半胱氨酸的自组装巨型金纳米粒子构成的.首先,由于静电作用或者配体末端的羧基和氨基基团之间的缩合反应,覆盖有半胱氨酸的金纳米粒子能够自组装形成纳米线和亚微米球形粒子.其次,球形自组装粒子在和疏水性室温离子液体1-辛基-3-甲基咪唑鎓六氟磷酸盐相互研磨时能形成一种准固态凝胶.最后,将复合凝胶涂在玻碳电极上,然后在PH=7.4的磷酸缓冲溶液中用循环伏安法进行极化,由于富余的室温离子液体分散在溶液中,形成了一种介孔组装结构.该材料具有良好的导电性和生物大分子亲和性.由于比表面积大和介孔内部的"薄层"效应,细胞色素c的氧化还原反应显著增强.实验结果表明,这种介孔材料在生物传感器和生物燃料电池等电化学器件方面具有潜在的应用前景.

Room temperature ionic liquid （RTIL） is used as a soft-template to organize a meso-macroporous material constructed by self-assembled giant gold nanoparticles which are capped by L-cysteine. First, L-cysteine capped gold nanoparticles can self-assembly to form nanowires and sub-micrometer spherical giant particles due to the static interac- tion and/or the condensation reaction between the carboxyl and amino groups at the outer terminal of the ligand. Second, the spherical assembled particles can form a quasi-solid gel when grinding with a hydrophobic RTIL, 1-octyl-3-metyllimidazolium hexafluorophospbate. Finally, when the composite gel is coated on a glassy carbon electrode and then polarized by using cyclic voltammetry in phosphate buffer solution （PBS, pH = 7.4）, a meso-macroporous structure is formed due to the leakage of the surplus of RTIL in the gel. This meso-macroporous structured material has a good conductivity and affinity to biological macromolecules. The faradaic current of cytochrome c can be enhanced significantly due to both the high outer surface area and the inner ＂thin-layer＂ effect. The experimental results indicate that this novel meso-macroporous material has potential application for electrochemical devices including biosensors and biofuel cells.