High-Quality Low-Cost Single Tungsten Disulfide Realize a Large-Area Preparation I

The journal Nature Communications recently published online the results of the RenWencai study group of Institute of Metal Research, the research realize the low-cost and large-area preparation of high-quality uniform strict monolayer tungsten disulfide (WS2) single crystal and thin films, which laid the material foundation on the applications of its flexible electronic / optoelectronic devices and valley electronics and spin electronics field.
 
The researchers found that gold is the only metal that does not react with sulphur and generate sulfide at a high temperature and have a catalytic activity, which can effectively reduce the barrier of tungsten trioxide vulcanization process, and tungsten atoms in gold have a extremely low solubility at high temperature.

WS2

 

Rare Earth Symposium will Be Held Soon, Attention on Rare Earth and Tungsten

Rare EarthRare Earth

Last week, nine tin enterprises in the country decided cut back production of 17,000 tons in 2016, which take place about 12% of national yield. It’s expected that it doesn’t exclude the possibility of purchasing and storage business in the future, reduction of output and purchasing and storage tin supply and demand situation is expected to improve.

Read more: Rare Earth Symposium will Be Held Soon, Attention on Rare Earth and Tungsten

Tungsten Diselenide-Thin Flexible Solar Cells Material

Austria Vienna University of Technology researchers who first developed by a tungsten diselenide (WSe2) making a diode, according to the experiment shows that this material can be used for thin flexible solar battery.
 
Although graphene is considered one of the most promising electronic material, but not suitable for build solar cells, which is why the Vienna University of Technology research team began looking for reasons other similar material graphene, they want to find one kind of ultra-thin layer can be arranged but with better electronic properties of a material.
"Graphene electronic state is not very suitable for the development of solar cells," Thomas Mueller said. Therefore, he and the research team began looking for other materials ── it must be similar to graphene, it can be arranged in a manner stacked thin, and has better electrical characteristics.
 
Tungsten Diselenide
 
Materials researchers later found that tungsten diselenide (WSe2), the main structure is composed of the upper and lower layer are connected by an intermediate layer of a selenium atom tungsten atoms. Such materials as graphene as WSe2 can absorb light, the light absorption can be used to generate electricity.
 
This films indeed thin and light about 95% can pass through the light , but the rest 5% of the light will be of absorbed by the material, and convert it into electricity. Therefore, its internal efficiency is very high. If multiple thin layers each stack, a large part of this incident light ray can be effectively utilized ── but sometimes this high transparency may have beneficial side effects.
 
"We can imagine the solar cell layer stack on the glass curtain, may allow some light into the building, but also to bring power available," Mueller said.
 
Most standard solar cells are made of silicon produced, not only quite cumbersome and inflexible. Although the organic material can be used for optoelectronic applications, but the degree of degradation is quite fast. "2D structure of a single atomic layer has a big advantage is its crystalline properties. The crystal structure adds to stability," Mueller explained.

 

 

MIT Scientists have Developed an Improved Tungsten Wire Light Bulbs

tungsten wire

With the development of economy and technology, the traditional tungsten wire light bulbs due to poor energy efficiency, in the trend of environmental protection, to be more energy-efficient LED bulbs and compact fluorescent lamps replaced. But the LED bulbs and compact fluorescent lamps issued a "cool white" light becomes brighter and slow process, a lot of people miss the days of tungsten wire light bulbs. According to reports, the US Massachusetts Institute of Technology (MIT) recently developed improved methods of tungsten wire light bulbs, the filament is surrounded with a special crystal structure, greatly reduce energy consumption which makes tungsten wire light bulbs more energy efficient than LED light bulbs and compact fluorescent lamps.
 
Tungsten wire light bulbs through the resistor and energized heated the finer tungsten to about 2700 ℃, allowed to issue glowing light, but in the whole process, 95% of the energy is converted to heat dissipation, so that the energy efficiency of tungsten wire light bulbs only 5%, compared to, LED bulbs and compact fluorescent lamps as the light energy can reach to 14%. It is for this reason that in 2012 prompted the EU comprehensive ban tungsten wire light bulbs.
 
To solve this problem, MIT scientists have developed with a special crystal structure surrounds the filament, and it will take the heat and trap the ultra-red radiation can let visible light through. The researchers believe this can make tungsten wire light bulbs energy efficiency reached 40%.
 
UK Energy Saving Trust data shows that if the general household use 60W traditional tungsten wire light bulbs, it takes 7.64 pounds per year (about 72.68 RMB), if using CFLs or LED bulbs, just 1.53, or 1.27 pounds per year respectively ( 14.55 or about RMB 12 RMB), but if the new improved tungsten wire light bulbs can really achieve the desired efficiency, it costs only 50 pence a year.

“Embarrass” of Tungsten Carbide Ball for Pen Using

It is reported that China has become the largest country of pen manufacture. However, in the back of a string of prides, such as 3,000 the enterprises, 200,000 employees, 40 billions of annual output, it still has the lack of core technology and highly depends on the bead import. Some related experts consider that the nib and the ink are the major parts of the pen, and the nib can be specifically divided in to the bead and the ball seat. At the present, tungsten carbide (WC) ball is the most widely used in the world, which China can not only meets the domestic needs, but also can be exported plenty. In addition, tungsten carbide ball for pen using can be specifically divided into WC-based cemented carbide, WC-TiC-based cemented carbide, Tic-based cemented carbide, Cr3C2-based cemented carbide and so on. WC-based cemented carbide is the most widely using for pen, although different basis of ball has different advantages and properties. Therefore, according to different ink and the material of nib, we should choose the proper ball and it can improve the quality of production.

While the production of the ball seat, either the equipments or the materials are mastered by Switzerland, Japan and other countries. “The small nib by traditional process requires more than 20 procedures, which should be manufactured separately”, Chen said, the honorary president of China Writing Instrument Association. So domestic pen manufacturers start to use the integrative production facility of other countries, and it has high demand on the raw materials, which domestic stainless steel wire is not suitable. Besides, the pen also has 5 grooves of ink flowing, which the precision should reach one of a thousand of millimeters and any deviation of the angle, the pressure, the bead, the nib and the ink grooves will have an effect on the fluency and the service life of the pen. Therefore, China allocated nearly 60 million to support the relevant research institutions, enterprises for the manufacture center of the ink, stainless steel wire tip, machining equipment to carry out scientific and technological research. However, acceptance of new technology and equipment business also requires a process, in order to remove this “embarrass”, we should find some way to increase the promotion of new technologies.

tungsten carbide ball

 

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