Reducing defects on multi-walled carbon nanotube surfaces induced by low-power ultrasonic-assisted hydrochloric acid treatment

Fan, Qingqing; Qin, Zongyi; Liang, Xia; Li, Li; Wu, Wenhua; Zhu, Meifang

doi:10.1080/17458080903536541

Cited by 20 publications

(15 citation statements)

References 30 publications

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“…SWCNTs being more uniform in structure (fewer defects) [78,79] having the attribute/quality of ballistic conductance [80] are obviously a better performer than MWCNTs. But considering the cost factor, MWCNTs are more economical than SWCNTs [81][82][83]. Moreover, functionalization of CNTs (with the -COOH group) induces enhancement in their beneficial effect [29,48,60], likely in the similar order as mentioned above, apparently due to good adhesion and dispersion within the active material.…”

Section: Discussionmentioning

confidence: 91%

Role of nano-carbon additives in lead-acid batteries: a review

Mahajan

Bharj

2019

Bull Mater Sci

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Development in lead (Pb)-acid batteries (LABs) is an important area of research. The improvement in this electrochemical device is imperative as it can open several new fronts of technological advancement in different sectors like automobile, telecommunications, renewable energy, etc. Since the rapid failure of a LAB due to Pb sulphation under partial-state-of-charging, electrode grid corrosion and water loss are some major obstructions in its advancement. The doping of various carbon forms into the negative active material of an electrode has been suggested to be effective at improving the storage capacity and cyclic life of LABs by suppressing irreversible sulphation. This report is an attempt to focus on different theories related to the working mechanism of carbon and to summarize the investigation results observed by various researchers regarding the significant role of nano-carbon additives in LABs. On the basis of that, we tried to compare their performance along with the discussion on the best possible additive.

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Section: Discussionmentioning

confidence: 91%

Role of nano-carbon additives in lead-acid batteries: a review

Mahajan

Bharj

2019

Bull Mater Sci

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“…3,23,30,44 On the other hand, the G band is caused due to E 2g tangential vibration of C-C bonds in graphene sheets and represents the structural integrity of sp 2 hybridised carbon atoms of CNT sidewall. 15,23 The D and G bands for pristine CNTs are observed at 1340 cm À1 and 1573 cm À1 , respectively (Figure 4(a)), whereas those bands for oxidised CNTs (Sample 4) are observed at 1342 cm À1 and 1571 cm À1 , respectively (Figure 4(b)). A slight increase in D band intensity is observed after functionalisation.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…Carbon nanotubes (CNTs) are the one dimensional fibrous allotropes of carbon, discovered by Iijima in the year 1991, [1][2][3] which have drawn the focus of researchers because of their unique set of properties arising from the strong sp 2 near planner hybridisation of C-C bond. 4,5 Versatile application paradigm of CNTs includes electronics, structural composites, medicines, automotive industries and energy storage media, 3,[6][7][8] due to their high aspect ratio 9,10 and outstanding properties, 11,12 like low density (1.3 g/cm 3 ), 13 high elastic modulus (around 1.8 TPa), 14 high tensile strength (up to 300 GPa), 8 high bending strength, 15 exceptional thermo-oxidative stability, 16 low co-efficient of thermal expansion (CTE ¼ 0) 17 and high electrical conductivity. 18 Presently many material scientists emphasise to use CNTs as reinforcements in aluminium matrix composites (AMCs), as the CNTs improve their hardness, strength, toughness, resistance to creep and wear remarkably.…”

Section: Introductionmentioning

confidence: 99%

Effective functionalisation of carbon nanotubes for reinforcement application in liquid state processed aluminium composites: A relatively greener approach

Sahoo

Das

Rath

et al. 2020

Journal of Composite Materials

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This paper outlines an innovative approach to functionalise multiwall carbon nanotubes at a reduced functionalisation time and energy consumption, preserving their structural integrity, with objective of potential application of the carbon nanotubes as reinforcement in aluminium matrix composites processed through liquid state method. Longstanding problems of aluminium carbide formation as reaction by-product in aluminium matrix composites is expected to be reduced by reinforcing the carbon nanotubes functionalised through the developed method. Carbon nanotube surfaces were oxidised following four different methods using solutions of different acids at different parametric combinations, and the best possible method was identified through dispersion stability test, Fourier-transform infrared spectroscopy, scanning electron microscopy, Raman spectroscopy and thermogravimetric analysis. Results revealed that primary oxidation by 6M HNO3, followed by subsequent oxidation by weak acid H2O2 generated functionalised carbon nanotubes with satisfactory dispersion stability, preserved graphitic structure, high degree of structural integrity, less structural distortion and less carbon nanotube fragmentation.

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“…By using carbon nanotubes as templates, very high specific surface area of polymer layers can be obtained, especially the free N-H environment and quinoid units along the PANI backbone, the high electrochemical performance can be obtained when PANI were coated on the surface of the CNTs [6,7]. In this work, multi-walled carbon nanotubes (MWCNTs) with significantly less structural defects was effective templates for preparing redoped nanocomposites [8]. P-toluene sulfonic acid (TSA) and 5-sulfosalicylic acid dihydrate (SSA) redoped PANI/MWCNT nanocomposites through a sequential doping-dedoping-redoping process were prepared, then thermal stability and electrochemical behaviour of both redoped nanocomposites would be investigated.…”

Section: Introductionmentioning

confidence: 99%

Secondary doping in polyaniline layers coated on multi-walled carbon nanotubes

Zhou¹,

Song²,

Li³

2015

MATEC Web of Conferences

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Abstract. HCl doped coaxial polyaniline/multiwalled carbon nanotubes (MWCNTs) nanocomposites were first prepared by in-situ chemical polymerization of aniline monomers in the presence of MWCNTs with less structural defects. P-toluene sulfonic acid (TSA) and 5-sulfosalicylic acid dihydrate (SSA) redoped PANI/MWCNT nanocomposites were achieved after the as-prepared nanocomposites were treated by ammonia respectively. The redoped nanocomposites were characterized by field emission scanning electron microscopy, transmission electron microscopy, fourier transform infrared spectroscopy, Raman, X-ray diffraction, thermogravimetric analysis and cyclic voltammetry, respectively. The results indicated that the thermal stability and electrochemical behaviour of TSA doped PANI/MWCNT nanocomposites were better than that of SSA doped PANI/MWCNT nanocomposites.

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Reducing defects on multi-walled carbon nanotube surfaces induced by low-power ultrasonic-assisted hydrochloric acid treatment

Cited by 20 publications

References 30 publications

Role of nano-carbon additives in lead-acid batteries: a review

Role of nano-carbon additives in lead-acid batteries: a review

Effective functionalisation of carbon nanotubes for reinforcement application in liquid state processed aluminium composites: A relatively greener approach

Secondary doping in polyaniline layers coated on multi-walled carbon nanotubes

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