Structural study on graphene-based particles prepared from old coconut shell by acid–assisted mechanical exfoliation

Malik Anjelh Baqiya, Ananda Yogi Nugraheni, Wildatun Islamiyah, Affandi Faisal Kurniawan, Muhammad Mahyiddin Ramli, Shuhei Yamaguchi, Yukio Furukawa, Siriwat Soontaranon, Edy Giri Rachman Putra, Yoyok Cahyono, Risdiana, Darminto*


研究成果: Article査読

23 被引用数 (Scopus)


This work is aimed to identify the structure of the graphene-based particles (GPs) from old coconut shell as the raw material after the mechanical exfoliation processes. The burnt coconut shell was at first heated at 400 °C for 5 h in ambient air. The sample was then stirred in an acid solution (HCl) and then continued by ultrasonication and centrifugation. The exfoliated GPs were characterized by x-ray diffraction (XRD), particle size analyzer (PSA), Fourier-transform infrared spectroscopy (FTIR), scanning and transmission electron microscopy (SEM and TEM, respectively), atomic force microscopy (AFM), Raman spectroscopy, and synchrotron wide and small angle x-ray scattering (WAXS and SAXS, respectively). The XRD and WAXS analyses show Bragg peaks corresponding to a pure phase of reduced graphene oxide (rGO). PSA, SEM/TEM, AFM, and Raman analyses show that the use of HCl-assist in the solution during the exfoliation process has successfully reduced particle size of the obtained GPs. SAXS pattern of the exfoliated GPs using the assist of HCl, confirmed by TEM and AFM images, results in the specific particle sizes of between 1.42 and 4.99 nm. The present mechanical exfoliation technique has successfully been applied to obtain several nanometers of GPs and provides an alternative of simple synthesis of biomass – based graphene products.

ジャーナルAdvanced Powder Technology
出版ステータスPublished - 2020 5月

ASJC Scopus subject areas

  • 化学工学一般
  • 材料力学


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