2011
DOI: 10.1021/la104999f
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Incorporation of Single-Walled Carbon Nanotubes into Ferrocene-Modified Linear Polyethylenimine Redox Polymer Films

Abstract: In this study, we describe the effects of incorporating single-walled carbon nanotubes (SWNTs) into redox polymer-enzyme hydrogels. The hydrogels were constructed by combining the enzyme glucose oxidase with a redox polymer (Fc-C(6)-LPEI) in which ferrocene was attached to linear poly(ethylenimine) by a six-carbon spacer. Incorporation of SWNTs into these films changed their morphology and resulted in a significant increase in the enzymatic response at saturating glucose concentrations (3 mA/cm(2)) as compared… Show more

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Cited by 51 publications
(40 citation statements)
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“…We chose to utilize the Fc-C 6 -LPEI redox polymer since we have demonstrated previously that it can efficiently electrically communicate with glucose oxidase when incorporated into crosslinked redox polymer-enzyme hydrogels, 30 layer-by-layer assembled films, 35 and films containing SWNTs. 32 As the pH of enzyme solution was increased from 3.3 to 4, there was no obvious change in the shape of cyclic voltammograms (Figure 2A). Further increase of enzyme solution pH caused a small shift in the oxidation peak potential that resulted in a broader potential peak separation ( E p ) that ranged between 123 to 130 mV.…”
Section: Resultsmentioning
confidence: 96%
“…We chose to utilize the Fc-C 6 -LPEI redox polymer since we have demonstrated previously that it can efficiently electrically communicate with glucose oxidase when incorporated into crosslinked redox polymer-enzyme hydrogels, 30 layer-by-layer assembled films, 35 and films containing SWNTs. 32 As the pH of enzyme solution was increased from 3.3 to 4, there was no obvious change in the shape of cyclic voltammograms (Figure 2A). Further increase of enzyme solution pH caused a small shift in the oxidation peak potential that resulted in a broader potential peak separation ( E p ) that ranged between 123 to 130 mV.…”
Section: Resultsmentioning
confidence: 96%
“…Their comparably small sizes theoretically allow CNTs to be positioned within proximity of the cofactor of the enzymes and reduce the electron tunneling distance . Polyethylenimine (PEI) is one of the useful functional polymers for immobilization and electrochemical applications utilizing different enzymes and GOx . Ferrocene derivatives can easily be incorporated into the PEI structure by using the active amine groups .…”
Section: Introductionmentioning
confidence: 99%
“…Polyethylenimine (PEI) is one of the useful functional polymers for immobilization and electrochemical applications utilizing different enzymes and GOx . Ferrocene derivatives can easily be incorporated into the PEI structure by using the active amine groups . Chuang et al proposed production methods for linear PEI and brunched PEI (BPEI)‐based ferrocene redox polymers.…”
Section: Introductionmentioning
confidence: 99%
“…18,19 Furthermore, SWCNTs have been utilized as an enzyme immobilization matrix and shown to enhance electron transfer efficiency. 20 The most widely utilized HRP-electrode confirmations based on carbon nano-materials are glutaraldehyde crosslinking, 12,21 layered nano-orientation using covalent attachment 22 and electrostatic interactions. 23 Each method has its challenge and its advantages depending on the biomolecule used.…”
Section: Introductionmentioning
confidence: 99%