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Researchers from the Netherlands Academy of nanosciences have grown diamond films on quartz substrates, then separated them and placed them on other devices. It opens up a way for the wide application of nano diamond films.
Materials scientists say that we can obtain and process Diamond nanofilms in a simple way, and then place them on various devices to test this extraordinary material.
Diamond film is one of the extraordinary materials on earth. It has not only high strength, high transparency, but also good thermal conductivity. Although they are bioinert, we can connect molecules on their surface to make their chemical properties more active. More importantly, when they are doped with additives, they will become semiconductors and can be used in electronic circuits.
It's no wonder that materials scientists are looking forward to the future of diamond. They hope to apply diamond more or less to all the devices they can think of.
But the problem is that diamond films must be grown in high temperature pure hydrogen atmosphere, which is not compatible with other micro devices such as silicon chip manufacturing methods.
So a useful way is to find a way to make the diamond film grow in one place, and then transfer to another place, so that the diamond film can be placed on the chip or other devices.
Today, Venkatesh seshan of the Netherlands Academy of nanosciences and several colleagues say they have improved a method of growing diamond films on quartz substrates, then separating them, and then placing the resulting diamond films on other devices.
The team first placed nano diamond seeds on the surface of quartz and heated them to above 500 C in hydrogen plasma atmosphere. Then the seed crystal grows up and a 180 nm thick and transparent surface layer of diamond crystal is obtained.
The team developed a new technology for separating diamond films from substrates. During the growth of diamond films, these materials expand at different rates to produce stress, which separates one layer from another. "By selecting appropriate conditions, the stress can be enough to make 180 nm thick diamond film fall off from the quartz surface and form numerous thin sheets." Seshan and his partners said.
The team used a light microscope to identify the diamond flakes, and then peeled them off with a sticky film, just like using transparent tape to get graphite flakes. Position the adhesive film on a device such as an electronic circuit and press it into place. It takes 10 minutes to peel off the adhesive film from the diamond nanowafer.
Seshan and his partners test their technology by producing a large number of diamond film devices. These devices include drum resonators, electronic circuits, and even diamond chips placed on top of other materials to prove that it is quite possible to create new materials with alternate layers of materials.
The new technology makes it easy for the team to describe the characteristics of nanodiamond films in a range of new situations. At the same time, it also opens up a way for the wide application of nano diamond film in other fields.
Of course, one thing needs to be stated in advance. Identifying and locating nanosheets is a time-consuming process. Therefore, this technology can not be applied to large-scale production of diamond sheet equipment. Therefore, there is still a long way to go in large-scale automatic positioning and parallelization technology.
But with the rapid development of machine vision technology, it may break this limitation in the near future. However, the large-scale parallelization of this manufacturing technology needs more research.
The potential of this technology is obvious, it can bring a new technology to complement and perfect the silicon era and graphene era that we are currently experiencing. In other words, we can begin to look forward to the "diamond" era.