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Metal ion and pH Sensors based on Carbon Nanotubes

Gou, Pingping (2012) Metal ion and pH Sensors based on Carbon Nanotubes. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The sensitive and selective detection of metal ions and pH levels is important in environmental and biomedical applications. Conventional methods are limited in their potential due to high cost, big size, and lack of portability. A new system incorporating single-walled carbon nanotubes (SWNTs) modified with polymers or proteins has been developed to create a cost-effective, easy-to-use metal ion/pH sensing platform. This system utilized SWNTs modified with metal ion/pH sensitive materials because pristine SWNTs are only sensitive to high concentrations of metal ions (> 1 mM), and strong base (pH > 12) or acid (pH < 2), and lack selectivity as well.
This work uses noncovalent functionalization approaches to chemically modify SWNTs because noncovalent modifications do not disrupt SWNT electronic properties. When the modified-SWNT system encounters metal ions or pH solutions, the alteration in modified layers, such as conformational change or charge transfer, initiates signal transduction processes, thus changing the electrical and optical properties of the underlying SWNTs. The properties of modified SWNTs were characterized by a variety of techniques including optical spectroscopy, and electrical transport measurements in solid state or liquid state, through which the transduction mechanism of the system was investigated.
The modified SWNT-based metal ion/pH sensors offer promise in applications and provide a platform for fundamental understanding of the transduction mechanism that help us to develop better chemical sensors in the future.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairStar, Alexanderastar@pitt.eduASTAR
Committee MemberWaldeck, Daviddave@pitt.eduDAVE
Committee MemberChapman, Tobytchapman@pitt.eduTCHAPMAN
Committee MemberLuo,
Date: 18 June 2012
Date Type: Publication
Defense Date: 13 February 2012
Approval Date: 18 June 2012
Submission Date: 17 April 2012
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 140
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: single-walled carbon nanotubes, Noncovalently Modification, polyazomethine, poly(1-aminoanthracene), calmodulin, Bacterioferritin
Date Deposited: 18 Jun 2012 15:39
Last Modified: 15 Nov 2016 13:57


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