Investigation of Electrochemical Properties of Carbon Nanofibers Prepared by CCVD Method

Autor:	Gheorghe Mihailescu, G. Watson, Zulfiqur Ali, Shun Quin Hu, Liliana Olenic, Alexandru R. Biris, Dan Lupu, Stela Pruneanu
Rok vydání:	2006
Předmět:	biology Carbon nanofiber General Chemical Engineering Analytical chemistry chemistry.chemical_element Redox chemistry Chemical engineering Electrode biology.protein Glucose oxidase Differential pulse voltammetry Cyclic voltammetry Carbon Biosensor
Zdroj:	Particulate Science and Technology. 24:311-320
ISSN:	1548-0046 0272-6351
DOI:	10.1080/02726350600840654
Popis:	Carbon nanofibers, with diameters between 80 and 290 nm and specific area of 242 m2g−1, have been prepared by the catalytic chemical vapor deposition method. After preparation, the powder was mixed with silicon oil in order to create a paste electrode. The electrochemical behavior of this type of electrode was investigated by cyclic voltammetry, using a solution of 10−3 M ferrocenecarboxylic acid as mediator. The redox process is quasi-reversible, and it involves the transfer of electrons between Fe(II) and Fe(III). The same mediator was used for the construction of a second-generation glucose biosensor. The mediator was co-immobilized with the enzyme in the carbon nanofibers paste. The sensor linearly responded to glucose, in the concentration range of 1.7 to 7 mM. A time of around 30 seconds was required to reach 95% of the maximum steady-state current. Also, the oxidation of calf thymus DNA at the carbon nanofiber paste electrode was investigated by differential pulse voltammetry (DPV). A clear signal,...
Databáze:	OpenAIRE
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