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

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July 1,2022.

Customized service about SAT NANO Nanomaterials

In addition to supplying some conventional nano-powder nano-materials, SAT NANO can also customize nano-materials for enterprises according to customer requirements, helping enterprises to upgrade their products. Specific services include: 1. Customi...

June 6,2022.

Low-cost manganese dioxide semi-solid electrodes for flow batteries

Manganese dioxide (MnO2) is abundant in reserves and inexpensive, and is expected to be used as a semi-solid electrode for long-life energy storage technologies such as flow batteries. However, the pumping requirements of semi-solid electrodes are mo...

April 19,2022.

New products and new technologies, SAT NANO provides various nanoparticle dispersions

The dispersion of nanomaterials has always been the key and difficult point in the application of nanomaterials. If nanomaterials are not sufficiently dispersed, the characteristics of nanomaterials cannot be exerted. SAT NANO technical engineers hav...

April 15,2022.

SAT Nano: How to realize the industrialization of precious metal nano powder materials step by step?

Precious metal nanomaterials, as a new class of materials, are used in various fields such as electronics, chemical industry, machinery, energy, metallurgy, ceramics and transportation, biology and medicine. The industrialization of precious metal na...

March 2,2022.

What is the market demand, industry output and development prospects of nano copper powder?

Nano copper powder is red brown or black powder. The copper atoms in nano copper powder are the same as those in ordinary copper powder, but the copper particles of nano copper powder are small, and the chemical properties are more active. Nano coppe...

December 16,2021.

SAT NANO shoulders the development mission of micro-nano silver powder industry with the spirit of craftsmanship

As an upgraded product of micron silver powder, nano silver powder is widely used in electronic pastes, bioengineering, optical materials, inorganic antibacterial materials, etc. Micron silver powder has great market prospects in high-end silver past...

August 3,2021.

SAT NANO established the spherical tantalum powder medical application division

Since its establishment, SAT NANO has adhered to the development idea of "specializing, specializing and new", giving full play to the advantages of high-quality refractory metal spherical powder preparation technology, combining upstream and downstr...

November 11,2020.

SAT NANO achieves mass production of zirconium carbide nanpowder 200nm

Zirconium carbide is a hard, high melting point material and an excellent high temperature refractory material. Used as a raw material for solid propellant in rocket motors. Used to produce alloy steel. It is also the raw material for producing metal...

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 ...

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...

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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