Staff View: Surface-dopylated carbon nanoparticles sense gas-induced ph changes

Surface-dopylated carbon nanoparticles sense gas-induced ph changes

Carbon nanoparticles of ca. 9-18 nm diameter (Emperor 2000™) are surface-modified by covalently linking l-dopa-boc (boc-protected l-3,4-dihydroxyphenylalanine) with a surface coverage of approximately 100 per particle (or 3 × 10 13 cm -2). In solution environments these redox-active nanoparticles pr...

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Main Authors:	Ibrahim, Norahim, Lawrence, Katherine, James, Tony D., Xia, Feng Jie, Mu, Pan, Shichun, Mu, Mitchels, John M., Frank, Marken
Format:	Article
Published:	Elsevier B. V 2012
Subjects:	QH Natural history
Online Access:	http://eprints.utm.my/id/eprint/47563/ http://dx.doi.org/10.1016/j.snb.2011.10.009
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id	my.utm.47563
record_format	eprints
spelling	my.utm.475632019-03-05T01:58:55Z http://eprints.utm.my/id/eprint/47563/ Surface-dopylated carbon nanoparticles sense gas-induced ph changes Ibrahim, Norahim Lawrence, Katherine James, Tony D. Xia, Feng Jie Mu, Pan Shichun, Mu Mitchels, John M. Frank, Marken QH Natural history Carbon nanoparticles of ca. 9-18 nm diameter (Emperor 2000™) are surface-modified by covalently linking l-dopa-boc (boc-protected l-3,4-dihydroxyphenylalanine) with a surface coverage of approximately 100 per particle (or 3 × 10 13 cm -2). In solution environments these redox-active nanoparticles provide chemically stable and pH-sensitive voltammetirc responses (reversible 2-electron 2-proton oxidation) over a pH range from 2 to 12. When mixed into Dowex 50 Wx4 cation exchanger or Dowex 50 1x2 anion exchanger and placed in contact with a glassy carbon electrode in a flow of humidified gas, the l-dopa-boc-modified carbon nanoparticles provide pH-sensitive surface probes to monitor the surface conditions. In a two-terminal cell it is demonstrated that gas flow measurements are possible with both modified cation and anion exchanger particles in contact to glassy carbon electrodes. The anion exchanger particles allow pH control after pre-conditioning in phosphate buffer. Loading-dependent sensitivity to ammonia gas is investigated and high sensitivity to ammonia is observed for Dowex 50 1x2 anion exchanger pre-equilibrated in phosphate buffer pH 3 and decorated with l-dopa-boc-modified carbon nanoparticles. Responses are observed with sequential injections of 1 cm 3 ammmonia into a gas flow-through device. Elsevier B. V 2012 Article PeerReviewed Ibrahim, Norahim and Lawrence, Katherine and James, Tony D. and Xia, Feng Jie and Mu, Pan and Shichun, Mu and Mitchels, John M. and Frank, Marken (2012) Surface-dopylated carbon nanoparticles sense gas-induced ph changes. Sensors And Actuators B: Chemical, 161 (1). pp. 184-190. ISSN 0925-4005 http://dx.doi.org/10.1016/j.snb.2011.10.009 DOI:10.1016/j.snb.2011.10.009
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	QH Natural history
spellingShingle	QH Natural history Ibrahim, Norahim Lawrence, Katherine James, Tony D. Xia, Feng Jie Mu, Pan Shichun, Mu Mitchels, John M. Frank, Marken Surface-dopylated carbon nanoparticles sense gas-induced ph changes
description	Carbon nanoparticles of ca. 9-18 nm diameter (Emperor 2000™) are surface-modified by covalently linking l-dopa-boc (boc-protected l-3,4-dihydroxyphenylalanine) with a surface coverage of approximately 100 per particle (or 3 × 10 13 cm -2). In solution environments these redox-active nanoparticles provide chemically stable and pH-sensitive voltammetirc responses (reversible 2-electron 2-proton oxidation) over a pH range from 2 to 12. When mixed into Dowex 50 Wx4 cation exchanger or Dowex 50 1x2 anion exchanger and placed in contact with a glassy carbon electrode in a flow of humidified gas, the l-dopa-boc-modified carbon nanoparticles provide pH-sensitive surface probes to monitor the surface conditions. In a two-terminal cell it is demonstrated that gas flow measurements are possible with both modified cation and anion exchanger particles in contact to glassy carbon electrodes. The anion exchanger particles allow pH control after pre-conditioning in phosphate buffer. Loading-dependent sensitivity to ammonia gas is investigated and high sensitivity to ammonia is observed for Dowex 50 1x2 anion exchanger pre-equilibrated in phosphate buffer pH 3 and decorated with l-dopa-boc-modified carbon nanoparticles. Responses are observed with sequential injections of 1 cm 3 ammmonia into a gas flow-through device.
format	Article
author	Ibrahim, Norahim Lawrence, Katherine James, Tony D. Xia, Feng Jie Mu, Pan Shichun, Mu Mitchels, John M. Frank, Marken
author_facet	Ibrahim, Norahim Lawrence, Katherine James, Tony D. Xia, Feng Jie Mu, Pan Shichun, Mu Mitchels, John M. Frank, Marken
author_sort	Ibrahim, Norahim
title	Surface-dopylated carbon nanoparticles sense gas-induced ph changes
title_short	Surface-dopylated carbon nanoparticles sense gas-induced ph changes
title_full	Surface-dopylated carbon nanoparticles sense gas-induced ph changes
title_fullStr	Surface-dopylated carbon nanoparticles sense gas-induced ph changes
title_full_unstemmed	Surface-dopylated carbon nanoparticles sense gas-induced ph changes
title_sort	surface-dopylated carbon nanoparticles sense gas-induced ph changes
publisher	Elsevier B. V
publishDate	2012
url	http://eprints.utm.my/id/eprint/47563/ http://dx.doi.org/10.1016/j.snb.2011.10.009
_version_	1643652343430905856
score	13.211869

Surface-dopylated carbon nanoparticles sense gas-induced ph changes

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