Recently, the team of researcher Tang Yongbing of the Research Center for Functional Thin Film Materials of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences and Professor Zhang Wenjun of the City University of Hong Kong have developed ultra-thin diamond nano-films with high transmittance from ultraviolet to infrared bands. Self-cleaning and anti-wear properties provide new strategies for surface protection in important fields such as optical lenses, marine precision instruments, high-definition monitoring, infrared sensors, etc. The research results "UV-to-IR highly transparent ultrathin diamond nanofilms with intriguing performances: Anti-fogging , self-cleaning and self-lubricating" has been published online on the Applied Surface Science (Applied Surface Science, 2020, DOI: 10.1016/j.apsusc.2020.146733, JCR1 area, IF=5.155).
Diamond has excellent optical properties, high thermal conductivity, ultra-high hardness, wear resistance, corrosion resistance, and good biocompatibility. Due to the limitation of the traditional pre-nucleation process, the thickness of the diamond film is generally 200 nm As mentioned above, the light transmittance tends to decrease as the film thickness increases, making it difficult to obtain high transmittance in the ultraviolet, visible, and infrared bands.
In view of this, researcher Tang Yongbing and his team members Huang Lei, Dr. Wang Tao and others successfully prepared a highly dense diamond nano-film with a thickness of only 45nm through self-assembled self-assembled CVD vapor deposition method. The coated quartz glass is in the ultraviolet-visible band The light transmittance is as high as 90%, and the light transmittance under water is as high as 98%, which is close to uncoated quartz glass. Diamond nano-film has the effect of anti-reflection in the infrared wave band, the transmittance of coated quartz glass is up to 85%, which is 10% higher than that of uncoated quartz glass.
Further research found that the surface-treated diamond nano-film has super-hydrophilic and underwater super-lipophilic properties, so that the coated glass still has the function of transparent anti-fog under the environment of steam and temperature changes, and can resist oil adhesion under water. , To achieve underwater self-cleaning function. In addition, this ultra-thin diamond nano-film has excellent anti-wear performance. After impacting the high-speed moving sand particles on the surface of the diamond nano-film, the surface morphology and light transmittance remain basically unchanged. And it was found that the coated quartz glass has an ultra-low friction coefficient and self-lubricating function, and the friction coefficient is more than three times lower than that of the uncoated coating.
At present, the ultra-thin ultra-thin diamond nanofilm with high light transmittance and wide band can be prepared on a variety of commercial substrate materials such as semiconductors, quartz, glass, etc. It has the fields of optical lens, optical element, monitoring, infrared sensing, marine precision instruments Good application prospects.