Structure and properties of hard carbon films depending on heat treatment temperatures via polymer precursor

Sun, Zhuo; Xu, Shaohui; Wang, Xuehang; Sun, Yi

doi:10.1016/s0925-9635(99)00009-6

Cited by 31 publications

(17 citation statements)

References 25 publications

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“…The structure and physicochemical properties of carbon produced from organic precursors change dramatically as a function of the pyrolysis temperature in the range from 600 to 1000 o C. 12 Current-sensing AFM and four-point probe measurements revealed that the carbons produced at a low pyrolysis temperature (600 o C) have low electronic conductivity, but the conductivity increased dramatically for carbons obtained at temperatures above 700 o C. 13,14 We found that there is a strong correlation between the structure of residual carbon and LiFePO 4 utilization in lithium cells at 0.055 mA/cm 2 . To resolve the Raman spectra of carbon in our samples, we applied a standard peak deconvolution procedure.…”

Section: Resultsmentioning

confidence: 99%

Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Doeff

McLarnon

et al. 2003

Electrochem. Solid-State Lett.

488

295

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Section: Resultsmentioning

confidence: 99%

Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Doeff

McLarnon

et al. 2003

Electrochem. Solid-State Lett.

488

295

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“…A considerable challenge is the temperature limitation (<750-800ºC) imposed by LiFePO 4 synthesis conditions. For example, the graphene content and electronic conductivity are low for carbons prepared from polymeric precursors at temperatures below about 700ºC [22,23] but increase dramatically above this temperature. However, the considerable variations found in the in situ carbon of LiFePO 4 samples suggest that much can be done to manipulate the structure, even considering the temperature constraints.…”

Section: Resultsmentioning

confidence: 99%

Optimization of carbon coatings on LiFePO4

Doeff

Wilcox

Kostecki

et al. 2006

Journal of Power Sources

231

139

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The electrochemical performance of LiFePO 4 in lithium cells is strongly dependent on the structure (disordered/graphene or D/G ratio) of the in situ carbon produced during synthesis from carbon-containing precursors. Addition of pyromellitic acid (PA) prior to final calcination results in lower D/G ratios, yielding a higher-rate material. Further improvements in electrochemical performance are realized when graphitization catalysts such as ferrocene are also added during LiFePO 4 preparation, although overall carbon content is still less than 2 wt. %.

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“…This technique has been used to study poly carbynphenyl films heat-treated at different temperatures 19 shown in Fig. 7.…”

Section: E Discussionmentioning

confidence: 99%

“…We have developed a simpler method to prepare nanostructured carbon films from a polymer precursor in a low pressure process. [16][17][18][19] Since the polymer precursor is soluble in most organic solvents, its solution can be easily applied to various substrates to form large area films. By controlling the post treatment conditions, various nanostructured carbon films can be obtained.…”

Section: Temperature Effect On Field Emission Properties and Microstrmentioning

confidence: 99%

Temperature effect on field emission properties and microstructures of polymer-based carbon films

Guo

Sun

Huang

et al. 2005

Journal of Applied Physics

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We investigated the field emission properties and resistivity of polymer-based carbon films prepared from poly ethyl-co-phenyl carbyne polymer precursors after treatment at different temperatures. As the heat-treatment temperature increased from 40to1200°C, the emission threshold field decreased from 12.4to2.1V∕μm, the emission current density increased from 0.1to6.1mA∕cm2, and the film resistivity decreased from 108to102Ωcm. The structural changes of the polymer films during the heat-treatment process were analyzed by Raman spectroscopy and atomic force microscopy. Raman analysis of these polymer-based carbon films suggests that the hydrogen content decreased while the sp2 carbon phase increased as the heat-treatment temperature increased. The dependence of the field emission properties of the polymer-based carbon films on the film structures (such as sp3, sp2 phases), film surface morphology and film resistivity is discussed. The enhancement of field emission from polymer-based carbon films was related to the increase of sp2∕sp3 ratio, film conductivity, and surface roughness with the heat-treatment temperature.

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Structure and properties of hard carbon films depending on heat treatment temperatures via polymer precursor

Cited by 31 publications

References 25 publications

Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]

Optimization of carbon coatings on LiFePO4

Temperature effect on field emission properties and microstructures of polymer-based carbon films

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