November 2017 – Silver Nanoparticles Antimicrobial,Copper Oxide Nanoparticles,Gold Nanopowder

November 28, 2017

Germanium nanopowder

In recent years, lithium-ion batteries as its main energy storage system has been widespread concern, the development of high energy density, high power density and long life capacity of high-performance lithium-ion battery research has gradually become a hot research.

Recently, alloy lithium-containing negative electrode materials (including silicon, germanium, tin-based anode materials) with higher lithium capacity have become the most promising alternative materials for future graphite-based negative electrode materials. The structural design of these materials at the nanometer scale can effectively improve the electrochemical cycle and magnification performance of these materials, and fully demonstrate its promising application prospect in the next generation high performance lithium ion battery.

Germanium has a higher electrical conductivity and lithium ion diffusion than silicon, so germanium is a powerful candidate for high-power lithium-ion battery anode materials. At present, the researchers try to prepare a variety of germanium nano structured materials to improve their electrode performance. Korean scholar Park and so on to obtain zero-dimensional hollow germanium nanoparticles and three-dimensional porous germanium nanoparticles, showing better cycle performance.

Also, researchers at the University of Munich, Germany (TUM) and the University of Munich (LMU) have discovered a new method of making thin, solid, and porous semiconductor layers using nano structured germanium materials that are expected to be used to develop portable solar cells and batteries electrode.

This material is very suitable for small, lightweight and soft solar cells, or to improve the performance of rechargeable batteries electrode. Scientists by integrating the amount of organic polymers in the pores of germanium materials can be tailored to create the electrical properties of the symbiotic mixture. This design not only saves space, but also create a large interface surface, enhance the overall performance. In the porous porous germanium nanometer film filled with the right amount of organic polymer, making it a hybrid solar cell。

Manufacturers around the world are looking for light weight, sturdy materials, and portable solar cells. So far they are mainly used for organic compounds, which are sensitive and have a relatively short life span. Heat and light decomposition of the polymer and result in reduced performance. The thin but strong germanium mix provides a real choice.

November 23, 2017

What will replace ITO？ Metal mesh? Or silver nanowires?

What is ITO?

Indium Tim Oxide(ITO), is a thin-film material, usually used in LCD,PDP,EL/OLED, Touch Panel, Solar Cells and transparency electrode of other electronic instruments.

ITO is now widely used in electronic products, but the future of electronics, such as mobile terminals, wearable devices, smart appliances, etc. Touch panel is hoped to become the large-size, cost-reduction and flexible. This is bound to promote the new materials to replace traditional ITO.

Traditional ITO thin film can’t used in flexible application, and its inherent problems—-conductivity and light transmittance are difficult to overcome. Thus, numerous manufacturers begin to find the substitutes for ITO, such as silver nanowires, metal mesh, carbon nanotubes(CNTs) and graphene.

From technology and marketization level, metal mesh and silver nanowires will be the two major roles in new-developing touch technology.

ITO alternatives – silver nanowires

What is the silver nanowires?

Silver nanowires (Ag NWs) technology, the silver nanowires ink material is applied on plastic or glass substrate, and then using the laser lithography technology to portray into a transparent conductive film with nanoscale silver line conductive network pattern.

The Advantages and Disadvantages of Silver Nanowires

Advantages:

the production process is simple and good rate.
since the line width is small, the conductive thin film made of silver nanowires technique can achieve higher light transmittance than the one made of a metal grid technology.
compared to the metal mesh film, silver nanowires films own a smaller radius of curvature and the resistance change rate is small while bending, the application on devices with surface display, such as smart watches, bracelets, etc, has more advantages.
besides excellent electrical conductivity than silver, because of the nanoscale size effect, silver nanowires also have excellent transparency and resistance to flex.
large aspect ratio of silver nanowires effect makes its applications in conductive plastic, thermal plastic and other fields also have outstanding advantages.
Disadvantages:

With the severe diffuse reflection light irradiation in outdoor scenes, the screen reflective strongly, you can not see the screen clearly.
Silver nanowires Status

1. although silver nanowires has slightly high raw material costs, its preparation is simple, thus the overall cost is not high. And diffuse phenomenon can use some techniques to reduce:
2. the silver nanowires coated with a high refractive index material film;
3. blackening silver nanowires surface;
4. Reduce the reflective intensity;
5. roughened silver nanowires.

HWNANO supply kinds of siver nanowirs with various specification(ultrafine diameter to <30nm, length to >20um). As for confecting dispersion liquid, different medium,concentration can be customized.

November 17, 2017November 28, 2017

Heat dissipation application of graphite powder in LED lamps

The features of graphite powder are soft, dark gray; oily feel that can contaminate the paper. In the isolated oxygen conditions, the melting point above 3000 ℃, is one of the most resistant minerals. At room temperature, the chemical properties of graphite powder are relatively stable, insoluble in water, dilute acid, dilute alkali and organic solvents; different high temperature reaction with oxygen to produce carbon dioxide or carbon monoxide. It only oxidizes with fluorine and simple carbon in the halogen. Graphite powder is easier to acid oxidation. Besides, it can also react with many metals to form metal carbide, which can be smelted at high temperature.
Graphite powder is the necessary raw materials for industrial production and application. The application of graphite powder has begun to move to the more high-end, which has launched a variety of applications, such as in electronics, new energy, high-end manufacturing, medical and other fields. LED lamps is the environmental protection and energy saving lamps recent years that LED lights cooling is the need to solve the problem of graphite powder.
LED lamps and lanterns of the poor heat can lead to damage to power, light failure accelerated, shortened life and other issues, LED lighting system performance is always the top priority, metal materials in the application of LED cooling difficult to process, energy consumption, density is too large, conductive, easy to deformation and difficult to recover waste and many other issues, and graphite powder material will not be such a problem, graphite powder plasticity is good, easy processing, and has excellent high temperature, thermal conductivity and other properties. Graphite powder can be processed into the graphite heat sink, the heat emitted by the lamp will be absorbed through the graphite heat sink, and even to the surrounding heat, graphite powder and plastic can also be made into a heat sink, cooling the cooling cup and cooling shell and so on.
There are many cooling performance in the application of LED lights, including LED chip packaging components, LED optical lens, light scattering components, efficient cooling components, light reflection and light diffusion board. Graphite powder of high-end products plays an important role in the solar transparent electrode, thermal materials and touch screen and other fields.