U.S. Develops Low Temperature Diamond Coatings

According to a recent report by the Physicist Organization Network, researchers from the US-based Advanced Diamond Technology Corporation have introduced an innovative method for applying diamond coatings to electronic devices at significantly lower temperatures. This breakthrough could pave the way for more durable and high-performance electronics in the future. The findings were published in *Applied Physics Letters*, a journal of the American Institute of Physics (AIP). Diamonds are known for their exceptional properties—such as extreme hardness, optical transparency, chemical resistance, and excellent thermal and electrical conductivity. These characteristics make them highly valuable in industrial and advanced technological applications. When used in electronic devices, boron is often added during the diamond synthesis process to make it electrically conductive through a process called doping. However, traditional methods of creating doped diamond films require extremely high temperatures, which can damage sensitive components like biosensors, semiconductors, and optical devices. In their latest study, the team from Illinois Advanced Diamond Technology Corporation developed a boron-doped diamond film that can be applied at much lower temperatures—between 460°C and 600°C. This represents a major step forward in making diamond coatings more widely applicable. Although the idea of growing boron-doped diamond films at lower temperatures isn't entirely new, previous attempts haven’t produced high-quality films suitable for commercial use. By adjusting the methane-to-hydrogen ratio and reducing the temperature, the research group was able to create a high-quality thin diamond film with comparable performance in terms of conductivity and surface finish. The researchers emphasize that further studies are needed to fully understand how the low-temperature process affects the material’s properties. With continued optimization, they believe it may be possible to grow boron-doped diamond films at even lower temperatures—below 400°C. According to Zeng Hongjun from Advanced Diamond Technology Co., Ltd., “The lower the growth temperature, the more electronic devices can benefit from diamond coatings. This could lead to broader applications, improved thickness control, better surface finish, and enhanced electrical performance.” This development has the potential to revolutionize the way we design and manufacture electronic components, opening up new possibilities in fields ranging from medical devices to next-generation computing systems.

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