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Title: Biosensing properties of diamond and carbon nanotubes
Authors: Poh, W.C.
Loh, K.P. 
De Zhang, W.
Triparthy, S.
Ye, J.-S. 
Sheu, F.-S. 
Issue Date: 22-Jun-2004
Citation: Poh, W.C., Loh, K.P., De Zhang, W., Triparthy, S., Ye, J.-S., Sheu, F.-S. (2004-06-22). Biosensing properties of diamond and carbon nanotubes. Langmuir 20 (13) : 5484-5492. ScholarBank@NUS Repository.
Abstract: The biochemical properties of boron-doped diamond (BDD), carbon nanofiber, fullerene, and multiwalled carbon nanotube (MWCNT) electrodes have been investigated comparatively. Physiochemical factors which affect the biosensing properties such as surface hydrophobicities, effective surface area, and intrinsic material properties are studied. Voltammetric responses of the as-grown thin film electrode and surface-modified electrode to biomolecules such as L-ascorbic acid (L-AA), dopamine (DA), and uric acid are examined. As-grown MWCNT electrodes exhibit selective voltammetric responses to the different biomolecules and faster electron-transfer kinetics compared to BDD. The selective response is due to the considerably lower anodic potential of L-AA on MWCNT (-48 mV vs Ag AgCl compared to 575 mV on BDD). This electrocatalytic response can be replicated on a nonselective carbon nanofiber electrode by coating it with gold nanoparticles. BDD has no intrinsic selective response to L-AA, and surface modification by anodic polarization is necessary for resolving L-AA and DA.
Source Title: Langmuir
ISSN: 07437463
DOI: 10.1021/la0490947
Appears in Collections:Staff Publications

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