Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation

Zheqiong Wu; Zhiqian Wang; Fang Yu; Megha Thakkar; Somenath Mitra

doi:10.1007/s11051-016-3697-2

Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation

Zheqiong Wu, Zhiqian Wang, Fang Yu, Megha Thakkar, Somenath Mitra

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m²/g while the critical coagulation concentration (CCC) values increased from 142.14 to 168.69 mM in the presence of NaCl, and the corresponding increase was from 0.97 to 5.32 mM in the presence of MgCl₂. As seen from cyclic voltammetry curves, the functionalized CNTs showed mainly non-Faradic interactions with Na₂SO_4, but showed Faradic behaviors in alkaline KOH.

Original language	English (US)
Article number	16
Journal	Journal of Nanoparticle Research
Volume	19
Issue number	1
DOIs	https://doi.org/10.1007/s11051-016-3697-2
State	Published - Jan 1 2017

All Science Journal Classification (ASJC) codes

General Chemistry
Condensed Matter Physics
Bioengineering
Atomic and Molecular Physics, and Optics
General Materials Science
Modeling and Simulation

Keywords

Carbon nanotubes
Colloidal stability
Degree of functionalization
Electrochemical property

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10.1007/s11051-016-3697-2

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title = "Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation",

abstract = "Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m2/g while the critical coagulation concentration (CCC) values increased from 142.14 to 168.69 mM in the presence of NaCl, and the corresponding increase was from 0.97 to 5.32 mM in the presence of MgCl2. As seen from cyclic voltammetry curves, the functionalized CNTs showed mainly non-Faradic interactions with Na2SO4, but showed Faradic behaviors in alkaline KOH.",

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AU - Wu, Zheqiong

AU - Wang, Zhiqian

AU - Yu, Fang

AU - Thakkar, Megha

AU - Mitra, Somenath

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m2/g while the critical coagulation concentration (CCC) values increased from 142.14 to 168.69 mM in the presence of NaCl, and the corresponding increase was from 0.97 to 5.32 mM in the presence of MgCl2. As seen from cyclic voltammetry curves, the functionalized CNTs showed mainly non-Faradic interactions with Na2SO4, but showed Faradic behaviors in alkaline KOH.

AB - Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m2/g while the critical coagulation concentration (CCC) values increased from 142.14 to 168.69 mM in the presence of NaCl, and the corresponding increase was from 0.97 to 5.32 mM in the presence of MgCl2. As seen from cyclic voltammetry curves, the functionalized CNTs showed mainly non-Faradic interactions with Na2SO4, but showed Faradic behaviors in alkaline KOH.

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KW - Colloidal stability

KW - Degree of functionalization

KW - Electrochemical property

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Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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