Preparation of Au/ polypyrrole composite nanoparticles and study of their electrocatalytical reduction to oxygen with (without) lacasse |
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| Authors: | Yuqing Miao Xiaohua Wu Jianrong Chen Jiwei Liu and Jingxia Qiu |
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| Affiliation: | (1) Key Laboratory of Rubber-Plastics Ministry of Education, Qingdao University of Science and Technology, Zhengzhou Road 53, Qingdao, 266042, People’s Republic of China;(2) Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON, N6A 5B9, Canada |
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| Abstract: | The colloids of Au/polypyrrole (AuPPy) composite nanoparticles were prepared by oxidizing pyrrole monomer with HAuCl4 in a cetyltrimethylammonium bromide (CTAB) solution. Scanning electron microscopy (SEM) suggests the AuPPy nanoparticles
in the form of regular spheres, approximately 200 nm in diameter. The resulting colloid of AuPPy composite nanoparticles strongly
adheres to the surface of Au electrodes and exhibits better electrocatalytical reduction of oxygen than bare Au electrodes.
It means that the complex procedures of centrifuge and wash are avoided. Also, no linker molecules are needed and the immobilization
of nanoparticles is achieved easily in a single-step procedure. The experimental parameters were optimized with regard to
the concentration of pyrrole and HAuCl4. The direct electron transfer of laccase is observed after it is immobilized on AuPPy modified electrodes by glutaraldehyde.
With the help of mediator 2,2′-azino-bis-(3-ethylbenzothiazoline-sulfonic acid) (ABTS), laccase electrode gives an electrocatalytical
reduction wave of oxygen at least at 0.8 V. This material is an excellent choice for the design of metal nanoparticle modified
electrodes or biosensors |
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