Structural evolution of hydrothermal carbon spheres induced by high temperatures and their electrical properties under compression

Zhipeng Wang, Hironori Ogata, Gan Jet Hong Melvin, Michiko Obata, Shingo Morimoto, Josue Ortiz-Medina, Rodolfo Cruz-Silva, Masatsugu Fujishige, Kenji Takeuchi, Hiroyuki Muramatsu, Tae Young Kim, Yoong Ahm Kim, Takuya Hayashi, Mauricio Terrones, Yoshio Hashimoto, Morinobu Endo

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Abstract

Graphitization of carbon materials plays an important role their microstructures and conductivity, and then influences their applications. However, the graphitization of hydrothermal carbon spheres (CSs) has not systemically investigated heretofore. The CSs with 60–250 nm in diameter were prepared from aqueous glucose solution by hydrothermal carbonization, and were treated at the high temperatures of 900–2900 °C in Ar atmosphere. The heat-treated CSs have demonstrated that their surface structure, microstructure, porosity, and polygonization strongly depend on the treatment temperatures. These results are supported by scanning and transmission electron microscopes, energy dispersive x-ray spectrometry, Raman, X-ray diffraction, and BET surface area analyses. We also investigated the electrical properties of the heat-treated CSs under compression, and found that the resistivity of the carbon particles is very dependent on their surface, microstructure, density, and polygonization. Therefore, high temperature treatment is an effective method to tailor the structure, morphology, and property of the hydrothermal CSs.

Original languageEnglish (US)
Pages (from-to)426-433
Number of pages8
JournalCarbon
Volume121
DOIs
StatePublished - Sep 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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    Wang, Z., Ogata, H., Melvin, G. J. H., Obata, M., Morimoto, S., Ortiz-Medina, J., Cruz-Silva, R., Fujishige, M., Takeuchi, K., Muramatsu, H., Kim, T. Y., Kim, Y. A., Hayashi, T., Terrones, M., Hashimoto, Y., & Endo, M. (2017). Structural evolution of hydrothermal carbon spheres induced by high temperatures and their electrical properties under compression. Carbon, 121, 426-433. https://doi.org/10.1016/j.carbon.2017.06.003