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High-quality single-layer tungsten disulfide powder achieves low-cost large-area production

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2019 Chinese Spring Festival holiday notice
January 24,2019.

2019 Chinese Spring Festival holiday notice

To All employees of the company: The annual Lunar New Year is already in sight. I wish all the staff a happy New Year and all the best! The specific arrangements for our 2019 holiday are as follows: Spring Festival holiday in 2019 (15 days): January ...

High-quality single-layer tungsten disulfide powder achieves low-cost large-area production
January 7,2019.

High-quality single-layer tungsten disulfide powder achieves low-cost large-area production

Recently, Ren Wencai, a researcher at the Advanced Carbon Materials Research Department of the National Institute of Materials Science, Institute of Materials Science, Chinese Academy of Sciences, has made new progress in the preparation of large-are...

Warmly celebrate the 2019 New Year's Day holiday
December 29,2018.

Warmly celebrate the 2019 New Year's Day holiday

New Year's Day is the beginning of our new year and the first holiday of our new year. The new weather plus the new holiday is a new good mood. Thanks to new and old customers for their support and trust in our company's nano materials. In 2019, our ...

Chinese scholars have developed a new nanowire catalyst with a diameter of only 1 nanometer.
December 17,2018.

Chinese scholars have developed a new nanowire catalyst with a diameter of only 1 nanometer.

The University of Science and Technology of China was informed that the research team of Hefei Microscale Materials Science National Research Center, Professor Zeng Jie and Professor Huang Hongwen of Hunan University have developed a new type of nano...

Nano-pigment on plastic spray becomes
November 15,2018.

Nano-pigment on plastic spray becomes

Rose gold, champagne gold, green gilt, snow silver... These beautiful and shiny "metals" are actually plastic products! The ultra-dispersive color aluminum pigment products developed by the most advanced "nano-micro coating technology" were unveiled ...

Nanotechnology is also a
November 4,2018.

Nanotechnology is also a "double-edged sword"

In our daily lives, nanotechnology will bring unexpected surprises to people. With nanometer (nm) coating, the refrigerator can be made into antibacterial, can be made into sterile tableware, can be made into self-cleaning glass and tiles without scr...

Chinese companies have successfully produced metal nanomaterials below 10 nanometers
October 29,2018.

Chinese companies have successfully produced metal nanomaterials below 10 nanometers

Through cooperation with domestic research institutes, Chinese companies have created a process oxidation method in the world after several years of trial and error and technological breakthroughs. They have taken the lead in the international produc...

China's carbon nanotube fiber research has made a major breakthrough
October 25,2018.

China's carbon nanotube fiber research has made a major breakthrough

For the first time in the world, the Chinese technical team has reported an ultra-long carbon nanotube tube bundle close to the theoretical strength of a single carbon nanotube, which has a tensile strength that exceeds all other fiber materials foun...

Nano Metal and Ceramic 3D Printing XJet Opens Manufacturing Center in Israel
October 22,2018.

Nano Metal and Ceramic 3D Printing XJet Opens Manufacturing Center in Israel

On October 22, 2018, Xjet officially opened its additive manufacturing center in Rehovot. Covering an area of 8,000 square feet and investing more than $10 million, Rehovot Technology Park is one of the world's largest metal and ceramic 3D printer ce...

Ultra-high density semiconductor type single-walled carbon nanotube horizontal array
October 20,2018.

Ultra-high density semiconductor type single-walled carbon nanotube horizontal array

ChinaPeking Universitycooperate with Chinese Academy of Sciencesto use ethanol / methanebychemical vapor deposition method to get ultrahigh-density semiconductor array level of single-walled carbon nanotube. Nowadays, as elec...

High-quality single-layer tungsten disulfide powder achieves low-cost large-area production

January 7,2019.

Recently, Ren Wencai, a researcher at the Advanced Carbon Materials Research Department of the National Institute of Materials Science, Institute of Materials Science, Chinese Academy of Sciences, has made new progress in the preparation of large-area high-quality uniform single-layer WS2 and flexible electronics applications. Based on binary phase diagram analysis and theoretical calculations, they found that gold is the only metal that does not react with sulfur at high temperatures to form sulfides, and gold has catalytic activity, which can effectively reduce the barrier of tungsten trisulfide vulcanization process, and gold at high temperature. The solubility of the tungsten atom is extremely low. On this basis, they proposed a surface-catalyzed atmospheric pressure CVD method using gold as a growth substrate to realize the preparation of high-quality, uniform single-layer millimeter-sized WS2 single crystals and large-area films. It is found that, similar to the growth of graphene on copper, the catalytic activity of gold and the extremely low solubility of tungsten in gold make the growth of WS2 on gold follow the self-limiting surface catalytic growth mechanism, thus ensuring a uniform single layer of high quality WS2 crystal. Growth. In addition, the single-layer WS2 prepared under normal pressure is weakly bonded to the gold matrix, so the electrochemical bubbling method can be used to achieve high-quality transfer of WS2 without damaging the gold matrix. The single layer WS2 produced by this method has a high crystalline quality and exhibits optical and electrical properties comparable to those prepared by mechanical stripping (far better than materials grown by inert matrix CVD).

In addition, they use the characteristics of gold foil with good flexibility and chemical stability, and propose a non-destructive transfer method combining roll-to-roll and electrochemical bubbling to realize large-area single-layer WS2 film without destroying the gold matrix. Low cost continuous transfer to flexible transparent substrates such as PET, PEN, etc. Through the layer transfer, a large-area flexible transparent double-layer, multi-layer WS2 film and a WS2/graphene laminated heterostructure functional film can also be prepared. Using the roll-to-roll electrochemical bubbling lossless transfer method, they also realized the fabrication of a large-area flexible transparent single-layer WS2 thin film transistor array. The electrical properties of the flexible device are comparable to those of the SiO2/Si substrate and are bent. After 100 times, the electrical performance does not decay.
The low-cost, large-area preparation of high-quality uniform single-layer WS2 single crystals and thin films lays the material foundation for their applications in flexible electronic/optoelectronic devices and valley electron and spintronic devices. The results were funded by the National Natural Science Foundation of China's Outstanding Youth Fund, major projects, innovation groups, and key deployment projects of the Chinese Academy of Sciences. They were published online on October 9th in Nature Communications (Nature Communications, 6:8569, DOI: 10.1038/ Ncomms9569, 2015).

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