In a recent interview, Shi Haofei, deputy director of the Micro-Nano Fabrication and System Integration Research Center at the Chongqing Institute of the Chinese Academy of Sciences, explained the challenges involved in creating high-quality, uniform single-layer graphene. He compared the difficulty to covering a standard football field with a thin layer of plastic wrap, emphasizing that achieving a completely flat and intact surface requires highly precise scientific control.
The research team has developed an independent method for growing 15-inch, high-quality, uniform single-layer graphene on copper foil under low-temperature conditions. They successfully transferred it onto flexible PET substrates and other flat surfaces, achieving the largest size reported in China so far. Moreover, they applied this graphene as a transparent electrode in a resistive touch screen, creating a 7-inch flexible touch screen with high light transmittance, no color distortion, and lower costs.
In recent years, graphene has gained recognition as a promising material for flexible transparent electrodes due to its excellent mechanical, thermal, optical, and electrical properties. However, for practical applications, the key challenges remain the large-scale production of high-quality graphene and the efficient transfer process.
Currently, common methods for preparing graphene include micro-mechanical exfoliation, SiC pyrolysis epitaxial growth, chemical vapor deposition (CVD), and chemical redox techniques. Among these, CVD is considered the most promising. It involves first growing graphene on a metal substrate and then transferring it to another surface. However, this process typically requires temperatures above 1000°C, which limits its use in industrial applications and raises energy and environmental concerns.
Shi Haofei shared details about the hospital's research on "key technology of graphene transparent electrode." The team expanded traditional CVD methods by using affordable and widely available industrial materials—such as plastics like PMMA and polystyrene, as well as liquid benzene—as effective carbon sources. This allowed them to grow high-quality graphene at a much lower temperature of 300°C, enabling controlled layer growth. Compared to ITO (indium tin oxide) currently used in the market, the graphene-based transparent electrode offers higher light transmittance (97.1%), fewer defects, better flexibility, lower power consumption, and more stable performance. It is also thinner, lighter, and significantly cheaper, with great potential to revolutionize fields such as touch screens, flexible displays, and solar cells.
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