Method for producing reduced graphene oxide

Abstract

The invention provides a method for producing reduced graphene oxide. The method comprises the following steps: mixing graphene oxide, a complexing agent and an acidic solution to obtain a mixed solution, wherein the graphene oxide has impurity ions combined on functional groups and has a first layer number; carrying out ultrasonic concussion to remove the impurity ions and combining the impurityions with the complexing agent; carrying out filtration to obtain purified graphene oxide; dispersing the purified graphene oxide in water to form a hydrogel; placing the hydrogel at a first temperature and a first pressure to obtain graphene oxide with a second layer number, wherein the second layer number is smaller than the first layer number; placing the obtained graphene oxide in an inert atmosphere; rapidly heating the graphene oxide to 500 DEG C or above by microwave and light wave irradiation to obtain reduced graphene oxide. The method provided by the invention has the following beneficial effects: the thoroughness of purification of graphene oxide can be effectively improved; the freeze-dried graphene oxide has a large interlayer spacing between sheet layers and few layers; in aphoto-microwave reduction process, the heating speed is high, the heating is uniform, and the reduction efficiency is high.

Description

technical field [0001] The invention relates to the field of preparation of reduced graphene oxide, in particular to a method for producing reduced graphene oxide. Background technique [0002] At the beginning of the 21st century, nano-graphite sheets appeared in the scientific community. In 2006, two scientists from The University of Manchester in the United Kingdom cleverly prepared single-layer graphite through mechanical exfoliation, thus officially unveiling the veil of graphene as a material, and they also won the 2010 Nobel Prize in Physics prize. An ideal graphene material is composed of a single layer of graphite, and its carbon atoms are connected by sp 2 The hybrid orbitals are connected to form a stable six-membered ring structure. Studies have found that graphene materials have good various physical and chemical properties. For example: better electronic conductivity than metal gold, better mechanical strength than steel, super large specific surface area, ...

AI Technical Summary

Problems solved by technology

The existing graphene oxide reduction method has the following problems in the production process: First, the use of chemical reagents for reduction requires the use of a large amount of chemical reagents, which increases the by-products, increases the difficulty of subsequent cleaning, and increases the risk of environmental protection, resulting in cost The second is to use high-temperature thermal reduction, the reduction temperature of graphene oxide is high, and the uniformity of product quality obtained by different reduction temperatures cannot be guaranteed, and it will also cause problems such as increased ash content of the product and serious corrosion of equipment; the third is to use other reduction method (such as plasma), the production technology is difficult, the cost will increase exponentially, and it cannot be applied on a large scale in industrialization

Images