TY - JOUR
T1 - Structural evolution of hydrothermal carbon spheres induced by high temperatures and their electrical properties under compression
AU - Wang, Zhipeng
AU - Ogata, Hironori
AU - Melvin, Gan Jet Hong
AU - Obata, Michiko
AU - Morimoto, Shingo
AU - Ortiz-Medina, Josue
AU - Cruz-Silva, Rodolfo
AU - Fujishige, Masatsugu
AU - Takeuchi, Kenji
AU - Muramatsu, Hiroyuki
AU - Kim, Tae Young
AU - Kim, Yoong Ahm
AU - Hayashi, Takuya
AU - Terrones, Mauricio
AU - Hashimoto, Yoshio
AU - Endo, Morinobu
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/9
Y1 - 2017/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85020427887&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85020427887&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2017.06.003
DO - 10.1016/j.carbon.2017.06.003
M3 - Article
AN - SCOPUS:85020427887
SN - 0008-6223
VL - 121
SP - 426
EP - 433
JO - Carbon
JF - Carbon
ER -