Enhanced Field Emission and Improved Supercapacitor Obtained from Plasma-Modified Bucky Paper

S Roy, R Bajpai, N Soin, P Bajpai, KS Hazra, N Kulshrestha, SS Roy, JAD McLaughlin, DS Misra

Research output: Contribution to journalArticle

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Abstract

The surface morphology of bucky papers (BPs) made from single-walled carbon nanotubes (CNTs) is modified by plasma treatment resulting in the formation of vertical microstructures on the surface. The shapes of these structures are either pillarlike or conelike depending on whether the gas used during plasma treatment is Ar or CH4. A complex interplay between different factors, such as the electric field within the plasma sheath, polarization of the CNT, intertubular cohesive forces, and ion bombardment, result in the formation of these structures. The roles played by these factors are quantitatively and qualitatively analyzed. The final material is flexible, substrate-free, composite-free, made only of CNTs, and has discrete vertically aligned structures on its surface. It shows enhanced field emission and electrochemical charge-storage capabilities. The field enhancement factor is increased by 6.8 times, and the turn-on field drops by 3.5 times from an initial value of 0.35 to 0.1 V μm−1 as a result of the treatment. The increase in Brunauer–Emmett–Teller surface area results in about a fourfold improvement in the specific capacitance of the BP electrodes. Capacitance values before and after the treatments are 75 and 290 F g−1, respectively. It is predicted that this controlled surface modification technique could be put to good use in several applications based on macroscopic CNT films
LanguageEnglish
Pages688-693
JournalSmall
Volume7
Issue number5
DOIs
Publication statusPublished - 2011

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Carbon Nanotubes
Field emission
Carbon nanotubes
Plasmas
Capacitance
Plasma sheaths
Single-walled carbon nanotubes (SWCN)
Ion bombardment
Surface morphology
Surface treatment
Gases
Electric fields
Polarization
Electrodes
Microstructure
Composite materials
Substrates
Ions
Supercapacitor

Cite this

Roy, S., Bajpai, R., Soin, N., Bajpai, P., Hazra, KS., Kulshrestha, N., ... Misra, DS. (2011). Enhanced Field Emission and Improved Supercapacitor Obtained from Plasma-Modified Bucky Paper. 7(5), 688-693. https://doi.org/10.1002/smll.201002330
Roy, S ; Bajpai, R ; Soin, N ; Bajpai, P ; Hazra, KS ; Kulshrestha, N ; Roy, SS ; McLaughlin, JAD ; Misra, DS. / Enhanced Field Emission and Improved Supercapacitor Obtained from Plasma-Modified Bucky Paper. 2011 ; Vol. 7, No. 5. pp. 688-693.
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Roy, S, Bajpai, R, Soin, N, Bajpai, P, Hazra, KS, Kulshrestha, N, Roy, SS, McLaughlin, JAD & Misra, DS 2011, 'Enhanced Field Emission and Improved Supercapacitor Obtained from Plasma-Modified Bucky Paper', vol. 7, no. 5, pp. 688-693. https://doi.org/10.1002/smll.201002330

Enhanced Field Emission and Improved Supercapacitor Obtained from Plasma-Modified Bucky Paper. / Roy, S; Bajpai, R; Soin, N; Bajpai, P; Hazra, KS; Kulshrestha, N; Roy, SS; McLaughlin, JAD; Misra, DS.

Vol. 7, No. 5, 2011, p. 688-693.

Research output: Contribution to journalArticle

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AU - Roy, S

AU - Bajpai, R

AU - Soin, N

AU - Bajpai, P

AU - Hazra, KS

AU - Kulshrestha, N

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AU - McLaughlin, JAD

AU - Misra, DS

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AB - The surface morphology of bucky papers (BPs) made from single-walled carbon nanotubes (CNTs) is modified by plasma treatment resulting in the formation of vertical microstructures on the surface. The shapes of these structures are either pillarlike or conelike depending on whether the gas used during plasma treatment is Ar or CH4. A complex interplay between different factors, such as the electric field within the plasma sheath, polarization of the CNT, intertubular cohesive forces, and ion bombardment, result in the formation of these structures. The roles played by these factors are quantitatively and qualitatively analyzed. The final material is flexible, substrate-free, composite-free, made only of CNTs, and has discrete vertically aligned structures on its surface. It shows enhanced field emission and electrochemical charge-storage capabilities. The field enhancement factor is increased by 6.8 times, and the turn-on field drops by 3.5 times from an initial value of 0.35 to 0.1 V μm−1 as a result of the treatment. The increase in Brunauer–Emmett–Teller surface area results in about a fourfold improvement in the specific capacitance of the BP electrodes. Capacitance values before and after the treatments are 75 and 290 F g−1, respectively. It is predicted that this controlled surface modification technique could be put to good use in several applications based on macroscopic CNT films

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