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¹Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Physical Chemistry Chemical Physics : PCCP

|February 15, 2013

Summary

Researchers developed an eco-friendly method to produce high concentrations of graphene sheets (GS) in water using optimized sonication. These graphene sheets were used to create transparent electrodes for solar cells.

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Dispersing graphite into few-layer graphene sheets (GS) in water offers an environmentally friendly, cost-effective, and low-energy approach.
Achieving high concentrations of graphene in aqueous solutions is crucial for scalable applications.

Purpose of the Study:

To optimize a method for high-yield graphene sheet (GS) exfoliation in water.
To characterize the properties of the exfoliated GS.
To fabricate conductive transparent electrodes using GS and carbon nanotubes (CNTs) for solar cell applications.

Main Methods:

Optimizing dispersant type and ultra-sonic generator for high GS concentration in water.
Implementing a multi-step sonication procedure using both tip and bath sonication.

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Characterizing exfoliated GS using Raman and transmission electron microscopy.

Fabricating electrodes with water-dispersed GS and CNTs.

Main Results:

Achieved very high GS concentrations in water (0.7 mg mL(-1)).
Multi-step sonication significantly enhanced GS exfoliation yield.
Characterization revealed few-layer graphene patches with dimensions of approximately 0.65 μm and 0.35 μm.
Fabricated electrodes demonstrated utility in a molecularly-controlled solar cell.

Conclusions:

An optimized, environmentally friendly method for producing high-concentration graphene sheets in water was established.
The few-layer graphene sheets are suitable for fabricating conductive transparent electrodes.
The developed electrodes show promise for applications in solar energy conversion, achieving an open-circuit voltage of 0.53 V.