Abstract/Details

Aligned multiple-wall carbon nanotubes as biosensors for phenols


2005 2005

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Abstract (summary)

Vertically oriented multiple-walled carbon nanotubes (MWCNTs) aligned on a silicon substrate were covalently bonded with horseradish peroxidase (HRP) and used as biosensors or electrodes. The modified platform was investigated with Scanning Electron Microscopy (SEM), UV-VIS spectrophotometer and Cyclic Voltammetry (CV). The enzyme catalyzed reaction and the subsequent reduction of the enzymatic products by the platform were carefully investigated. The typical SEM micrographs of MWCNT-chip before and after HRP immobilization are obviously different. The colorimetric assay was done by measuring the absorbance of the dye formed from the reaction product of the substrates (phenol) and 4-aminoantipyrine. From the linear response, phenol can be quantitated in the range from 0.5 mM to 8.0 mM. The electrodes exhibited excellent electrochemical activity in aqueous solution, and the linearity range for phenol concentration lied up to 0.6 mM. The resulting modified aligned MWCNTs still exhibited enzymatic activities after storage of 13 days.

Indexing (details)


Subject
Analytical chemistry
Classification
0486: Analytical chemistry
Identifier / keyword
Pure sciences; Biosensors; Carbon nanotubes; Phenols
Title
Aligned multiple-wall carbon nanotubes as biosensors for phenols
Author
Wu, Jing-Ru
Number of pages
100
Publication year
2005
Degree date
2005
School code
0111
Source
DAI-B 66/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780496984909, 049698490X
Advisor
Li, Kuang-Pang
University/institution
University of Massachusetts Lowell
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3164043
ProQuest document ID
304990796
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304990796
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