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Title: Direct amperometric detection of glucose on a multiple-branching carbon nanotube forest
Authors: Tan, C.K. 
Loh, K.P. 
John, T.T.L. 
Issue Date: 2008
Citation: Tan, C.K., Loh, K.P., John, T.T.L. (2008). Direct amperometric detection of glucose on a multiple-branching carbon nanotube forest. Analyst 133 (4) : 448-451. ScholarBank@NUS Repository.
Abstract: We show here that a re-structured carbon nanotube (CNT) forest can be used 'as-received' for high selectivity, non-enzymatic glucose detection without the need to incorporate catalytic metal nanoparticles or an exclusion polymeric membrane. Direct amperometric sensing of glucose has been achieved by using multiply-branched CNTs prepared by growing secondary or tertiary 'offshoot' CNTs on top of the existing CNT layer. The increased roughness factor on these re-structured CNTs enhances the amperometric detection sensitivity for glucose by a factor of 20× over that of interfering species like ascorbic acid or uric acid. A sensitivity of 60 μA mM-1 cm-2 and a detection limit of 1 μM, with a linear detection range of 1-11 mM (R 2 = 0.999), could be attained on the re-grown CNTs. When the re-grown CNTs were subjected to further anodization in acid to introduce a highly-charged interface, the sensitivity to glucose was enhanced to 157 μA mM-1 cm-2. © The Royal Society of Chemistry.
Source Title: Analyst
ISSN: 00032654
DOI: 10.1039/b719914g
Appears in Collections:Staff Publications

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