Electrical conductivity of single polycrystalline-amorphous carbon nanocoils

Sun, Yongli; Wang, Chenwei; Pan, Lujun; Fu, Xin; Yin, Penghe; Zou, Helin

doi:10.1016/j.carbon.2015.11.025

Cited by 50 publications

(39 citation statements)

References 25 publications

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“…The resistivity of the device is linear with respect to temperature and decreases at ~ −1.8 × 10 −5 Ω m/°C, i.e., has a negative slope. The electrical resistivity and, in particular, the temperature dependency of the resistivity of carbon NCs, graphite, and other allotropes of carbon are well-known and have been studied extensively [7][8][9][10][11][12][13][14][15][16][17][18][19]. At and near room temperature, the temperature dependence of the resistivity for conductive carbons is linear and the TCOR can be calculated using Equation (5).…”

Section: Electrical Characteristicsmentioning

confidence: 99%

WITHDRAWN: Utilizing a single silica nanospring as an insulating support to characterize the electrical transport and morphology of nanocrystalline graphite

Wojcik

Rajabi

Zhu

et al. 2019

Materials Chemistry and Physics

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Section: Electrical Characteristicsmentioning

confidence: 99%

WITHDRAWN: Utilizing a single silica nanospring as an insulating support to characterize the electrical transport and morphology of nanocrystalline graphite

Wojcik

Rajabi

Zhu

et al. 2019

Materials Chemistry and Physics

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“…It is found that the lattice is partially ordered, indicating that many graphite grains ( sp 2 structured) are embedded in an amorphous network ( sp 3 structured), and the circles show that the sp 2 grains have an average size of approximately 5 nm. The HRTEM image certifies that the CNCs synthesized under the Fe/Sn molar ratios of 10:1 have a polycrystalline-amorphous structure [ 47 ]. Figure 2 c, d is the representative TEM and HRTEM images of a single CNF (from the deposit prepared by the catalyst with Fe/Sn molar ratio of 3:1) with a line diameter of approximately 120 nm.…”

Section: Resultsmentioning

confidence: 99%

Growth of Carbon Nanocoils by Porous α-Fe2O3/SnO2 Catalyst and Its Buckypaper for High Efficient Adsorption

et al. 2020

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HIGHLIGHTS• High-purity (~ 99%) carbon nanocoils (CNCs) without the amorphous carbon layer were synthesized by using porous α-Fe 2 O 3 /SnO 2 catalyst.• The highest yield of the CNCs can reach ~ 9098% after a 6 h growth, which is much higher than those mentioned in previous reports.• A CNC Buckypaper was successfully prepared and utilized as an efficient adsorbent for the removal of methylene blue dye with the adsorption efficiency of 90.9%.ABSTRACT High-purity (99%) carbon nanocoils (CNCs) have been synthesized by using porous α-Fe 2 O 3 /SnO 2 catalyst. The yield of CNCs reaches 9,098% after a 6 h growth. This value is much higher than the previously reported data, indicating that this method is promising to synthesize high-purity CNCs on a large scale. It is considered that an appropriate proportion of Fe and Sn, proper particle size distribution, and a loose-porous aggregate structure of the catalyst are the key points to the high-purity growth of CNCs. Benefiting from the high-purity preparation, a CNC Buckypaper was successfully prepared and the electrical, mechanical, and electrochemical properties were investigated comprehensively.Furthermore, as one of the practical applications, the CNC Buckypaper was successfully utilized as an efficient adsorbent for the removal of methylene blue dye from wastewater with an adsorption efficiency of 90.9%. This study provides a facile and economical route for preparing high-purity CNCs, which is suitable for large-quantity production. Furthermore, the fabrication of macroscopic CNC Buckypaper provides promising alternative of adsorbent or other practical applications.

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“…The electrical resistivity and, in particular, the temperature dependency of the resistivity of carbon NCs, graphite, and other allotropes of carbon are well-known and have been studied extensively [7,8,9,10,11,12,13,14,15,16,17,18,19]. At and near room temperature, the temperature dependence of the resistivity for conductive carbons is linear and the TCOR can be calculated using Equation (5).…”

Section: Resultsmentioning

confidence: 99%

“…The unique electrochemical properties of GUITAR suggest that it is not just another form of graphite; further investigation of its morphology and electrical properties is required to classify GUITAR within the spectrum of carbon materials. The electrical resistivity and the temperature dependence on the resistivity of carbon nanocoils (NCs), graphite, and other allotropes of carbon vary greatly from allotrope to allotrope [7,8,9,10,11,12,13,14,15,16,17,18,19], thereby assisting in their identification and classification. The Raman spectra of the different carbon allotropes is equally diverse [20,21,22,23,24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite

et al. 2019

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A graphitic carbon, referred to as graphite from the University of Idaho thermolyzed asphalt reaction (GUITAR), was coated in silica nanosprings and silicon substrates via the pyrolysis of commercial roofing tar at 800 °C in an inert atmosphere. Scanning electron microscopy and transmission electron microscopy images indicate that GUITAR is an agglomeration of carbon nanospheres formed by the accretion of graphitic flakes into a ~100 nm layer. Raman spectroscopic analyses, in conjunction with scanning electron microscopy and transmission electron microscopy, indicate that GUITAR has a nanocrystalline structure consisting of ~1–5 nm graphitic flakes interconnected by amorphous sp3 bonded carbon. The electrical resistivities of 11 single GUITAR-coated nanospring devices were measured over a temperature range of 10–80 °C. The average resistivity of all 11 devices at 20 °C was 4.3 ± 1.3 × 10−3 Ω m. The GUITAR coated nanospring devices exhibited an average negative temperature coefficient of resistivity at 20 °C of −0.0017 ± 0.00044 °C−1, which is consistent with the properties of nanocrystalline graphite.

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Electrical conductivity of single polycrystalline-amorphous carbon nanocoils

Cited by 50 publications

References 25 publications

WITHDRAWN: Utilizing a single silica nanospring as an insulating support to characterize the electrical transport and morphology of nanocrystalline graphite

WITHDRAWN: Utilizing a single silica nanospring as an insulating support to characterize the electrical transport and morphology of nanocrystalline graphite

Growth of Carbon Nanocoils by Porous α-Fe2O3/SnO2 Catalyst and Its Buckypaper for High Efficient Adsorption

Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite

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