Room Temperature Ionic Liquid Templated Meso-Macroporous Material by Self-Assembled Giant Gold Nanoparticles and Its Enhancement on the Direct Electrochemistry of Cytochrome c

Authors

Pei LI, State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Dong-ping ZHAN, State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;Follow
Yuan-hua SHAO, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;Follow

Corresponding Author

Yuan-hua SHAO(yhshao@pku.edu.cn)

Abstract

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 interaction 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 hexafluorophosphate. 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.

Graphical Abstract

Keywords

room temperature ionic liquid, self-assemble, gold nanoparticles, cytochrome c, biosensors

DOI Link

https://doi.org/10.13208/j.electrochem.130882

Publication Date

2014-08-28

Online Available Date

2013-12-21

Revised Date

2013-12-11

Received Date

2013-08-23

Recommended Citation

Pei LI, Dong-ping ZHAN, Yuan-hua SHAO. Room Temperature Ionic Liquid Templated Meso-Macroporous Material by Self-Assembled Giant Gold Nanoparticles and Its Enhancement on the Direct Electrochemistry of Cytochrome c[J]. Journal of Electrochemistry, 2014 , 20(4): 323-332.
DOI: 10.13208/j.electrochem.130882
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss4/5