Graphite Whiskers Derived from Waste Coffee Grounds Treated at High Temperature

Gan Jet Hong Melvin; Zhipeng Wang; Shingo Morimoto; Masatsugu Fujishige; Kenji Takeuchi; Yoshio Hashimoto; Morinobu Endo

doi:10.1002/gch2.201800107

Graphite Whiskers Derived from Waste Coffee Grounds Treated at High Temperature

Glob Chall. 2019 Feb 12;3(8):1800107. doi: 10.1002/gch2.201800107. eCollection 2019 Aug.

Authors

Gan Jet Hong Melvin¹, Zhipeng Wang², Shingo Morimoto³, Masatsugu Fujishige³, Kenji Takeuchi³, Yoshio Hashimoto³, Morinobu Endo³

Affiliations

¹ Material and Mineral Research Unit Faculty of Engineering Universiti Malaysia Sabah Jalan UMS 88400 Kota Kinabalu Sabah Malaysia.
² Institute of Advanced Materials Jiangxi Normal University 99 Ziyang Avenue Nanchang Jiangxi 330022 China.
³ Institute of Carbon Science and Technology Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan.

Abstract

Graphite whiskers (GWs) are obtained from coffee grounds (CGs) treated at 2500 °C for 1 h in the presence of Ar gas at 1 atm. The majority of the GWs formed inside the CGs shell are rod-like with a conical tip with diameter and length in the range between 1 to 3 µm and 4 to 10 µm, respectively. At first, the carbon layer might be grown in a turbostratic manner, and then progressively graphitized at higher temperature. The strong G' peak intensity might be induced by the disclination of graphitized carbon layers.

Keywords: Raman spectroscopy; coffee grounds; graphite whiskers; high temperature.