Large scale synthesis of 2D graphene oxide by mechanical milling of 3D carbon nanoparticles in air

TL;DR

This study demonstrates a simple, cost-effective method to produce large-scale graphene oxide by mechanically milling carbon nanoparticles in air, reducing layer thickness and increasing oxygen attachment with longer milling times.

Contribution

It introduces a novel large-scale synthesis approach for graphene oxide using mechanical milling of carbon soot in air, emphasizing efficiency and scalability.

Findings

Layer thickness decreases with milling time.

Oxygen attachment increases with milling time.

Significant GO content achieved after 5 hours of milling.

Abstract

Graphene oxide (GO) is one of the important functional materials. Large-scale synthesis of it is very challenging. Following a simple cost-effective route, large-scale GO was produced by mechanical (ball) milling, in air, of carbon nanoparticles (CNPs) present in carbon soot in the present study. The thickness of the GO layer was seen to decrease with an increase in milling time. Ball milling provided the required energy to acquire the in-plane graphitic order in the CNPs reducing the disorders in it. As the surface area of the layered structure became more and more with the increase in milling time, more and more oxygen of air got attached to the carbon in graphene leading to the formation of GO. An increase in the time of the ball mill up to 5 hours leads to a significant increase in the content of GO. Thus ball milling can be useful to produce large-scale two-dimensional GO for a short time.