Preparation of Graphene-Based TCE

Alfa Chemistry is pleased to provide customers with the service of preparing graphene-based transparent conductive electrodes (TCE). Alfa Chemistry not only stably disperses chemically reduced graphite oxide in aqueous solution through electrostatic action, but also synthesizes single-layer or several-layer graphene transparent conductive films by CVD method. This provides the possibility for applications in graphene LCD, OLED, solar cells, and photodetectors.

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We use the following techniques (not limited to) to produce graphene-based TCE:

• Solution-Treated Graphene-Based TCE

Solution processing is the most suitable way to produce large amounts of TCE at the lowest cost. Usually, it is divided into two steps: ① Decompose graphite into graphene flakes, ② Fabricate graphene film on the substrate. Chemical peeling and ultrasonic peeling are the first steps in the solution phase. After purification, chemically converted graphene oxide or sonic cut graphene flakes can form a stable suspension in the liquid phase. The surface of GO has high oxygen-containing groups, so it is insulating. After coating on the substrate, the GO film needs to be further converted into reduced graphene oxide for conduction. In order to avoid oxidation and reduction, we also provide some direct liquid phase methods to produce raw graphene. For example, ultrasonic treatment of graphite in dimethylformamide can simply peel off the graphite and obtain a well-dispersed suspension.

• CVD Graphene-Based TCE

Chemical vapor deposition (CVD) growth is the most suitable method for manufacturing high-performance graphene films. The quality of graphene grown by CVD on a transition metal (mainly nickel and copper) catalytic substrate is close to that of micromechanically exfoliated graphene from highly oriented pyrolytic graphite (HOPG), and it is easy to form a large-area thin film. CVD graphene is mainly grown in vacuum. Because low pressure CVD is compatible with modern microelectronics industry, producing CVD graphene in large scale can reduce costs.

Figure 1. Bilayer graphene formation from Ni coated polymers or SAMs on SiO₂/Si substrates after annealing at high temperature under hydrogen. (Yan Z, et al. 2011)

• Graphene-Based Hybrid TCE

One way to improve the conductivity of solution-processed graphene films is to add conductive filler materials to it. For example, graphene is mixed with carbon nanotubes or metal nanowires. It is generally believed that graphene and CNT (or other filler materials) provide a conductive path for each other in the percolation network.

Application fields

Graphene-Based TCE can be used in but not limited to the following fields.

How we do?

1. The chemistry experts at Alfa Chemistry provide various graphene conductive materials for transparent electrode research and modification strategies.

2. Alfa Chemistry provides technical support to guide the synthesis of new products.

3. Alfa Chemistry has the ability to work with you to complete a more important development project based on graphene transparent conductive electrodes.

If you are interested in our services, please contact us for more detailed information.