Physical Properties Comparison of rGO-like phase prepared from Coconut Shell and the Commercial Product

Abstract

Electrical dan magnetic properties of graphene-derivatives materials are strongly influenced by their physical properties. Here we report a study on physical properties of reduced graphene oxide (rGO) prepared from two different raw materials, namely coconut shell (rGO-s) and graphite mineral (rGO-c, produced by Graphenea Inc.). rGO-s was prepared by carbonization method followed by mechanical exfoliation. While both samples have the same density of about 1.9 g/cm 3 , rGO-c has more porous compared to rGO-s. Specific surface area in rGO-c was also obtained much larger than that of rGO-s. Examinations on particle size and surface morphology show that rGO-c has homogenous particles which consist of transparent thin sheets, while rGO-s has rather heterogenous particles that look like dens stacked sheets. The presence of C and O was confirmed at the observed morphology. The difference in physical features was found to influence the obtained electrical conductivity of the samples. rGO-c has higher conductivity than rGO-s. Estimation on gap energy (Eg) indicates that rGO-c and rGO-s have Eg in the range of semiconducting materials. The study provides a better understanding on physical properties of coconut shell-derived rGO to further revise synthesis method to improve quality of the obtained rGO.

Effect of the Carbon Source on the Characteristics of Silica-carbon as a Handphone’s Case Material

“…From several activated carbons, it is known that activated carbon from coconut shells [11] and activated carbon from bamboo [12] have a reasonably high surface area, around 189,630-1900.69 m 2 /g according to SII No.0258 -79. On the other hand, carbon can also be obtained from commercial materials such as coal [13].…”

Analysis of Phase and Energy Band Gap Width of Corncob Carbon-PEG 4000

“…Carbon is one of the materials that have the potential to be used for various purposes, including in the fields of the utilization of electronic components [3], optics [4], mechanics [5], as an absorbent (adsorbent) [6], aircraft brakes, batteries, fuel cell electrodes [7], and supercapacitors. Carbon has three main structures or allotropes of carbon: graphite, fullerenes, and diamond [8]. Carbon can be produced from pyrolysis combustion and the carbonization process of organic materials.…”