Yellow tungsten oxide, namely tungsten trioxide or WO3, is a kind of semiconductor material having excellent performance and wide applications. As a semiconductor photocatalyst, tungsten trioxide has a wide range of applications in the fields of photolysis of water to produce hydrogen and oxygen, and degradation of organic pollutants or inorganic pollutants. However, the photocatalytic activity of WO3 needs to be further improved to make better use of solar energy. In this regard, the experts have proposed a method to improve the photocatalytic activity of yellow tungsten oxide.

Do you know how to improve the photocatalytic property of yellow tungsten oxide? As a photocatalyst, yellow tungsten oxide (tungsten trioxide/WO3) has broad application prospects in photolysis of water, and degradation of organic and inorganic pollutants in the atmosphere and under water. However, the band gap of WO3 is 2.7eV, so that it can only absorb and use the part with less than 450nm wavelength in sunlight, and can only use about 10% of the energy in solar energy. In other words, at present, WO3 photocatalyst generally has shortcomings such as short absorption wavelength, low solar spectrum utilization, and high carrier recombination rate.

In recent years, semiconductor photocatalytic research has developed rapidly. Wherein, yellow tungsten oxide (tungsten trioxide /WO3) has become more and more attractive as a photocatalyst. Tungsten trioxide catalyst has the advantages of stable catalytic performance, no secondary pollution, no photo-corrosion and no toxicity. Therefore, it is widely used in photocatalytic water splitting. Some experts researched the photocatalytic activity of WO3 and found that the optimal oxygen production of WO3 is about 79.9 μmol/(L·h) under visible light radiation.

The photocatalytic performance of nonmetal-doped yellow tungsten oxide as a photocatalyst is improved compared to pure WO3. This is because compared with O2p orbitals, nonmetal ions such as C, N, F and S have orbits with relatively high energy. Substituting some of O atoms in semiconductor oxides (such as WO3) with the abovementioned atoms may increase the position of the valence band of the semiconductor, reduce the semiconductor band gap width, and make its absorption edge red shift.

Yellow tungsten oxide is also called tungsten trioxide (WO3). Tungsten trioxide is an electrochromic material that has been widely investigated and is expected to replace traditional energy-saving glasses. And WO3 thin film is the most favorable inorganic electrochromic film that has been researched. Some experts have prepared WO3 electrochromic film by the sol-gel method, and studied the effect of heat treatment temperature on the discoloration characteristics and structure of the obtained WO3 films.

In the past few years, many users of ammonium paratungstate (APT) have a more strict quality requirement in its quality, including particle-size and apparent density, crystal shape, etc. Thus, a new preparation of APT with coarse grain that meets the requirements of industry has been introduced.

Do you know how to prepare tungsten needle efficiently? The experts have proposed a method for preparing tungsten needles with the advantages of high degree of automation, good repeatability and high efficiency.

The quality of tungsten needle is directly related to the detection capability of the scanning electron microscope (STM). The size, shape and chemical identity of the tungsten tip affect not only the resolution and shape of the STM image, but also the electronic state of the measurement. Therefore, the preparation of tungsten tip is particularly important. And it had better to obtain a tungsten tip with a specific radius of curvature.

It has been reported that only nano tungsten needle having sharp tip and single atom at the apex can provide stable and reliable atomically resolved imaging for applications of scanning tunneling microscopy (STM). Well, do you know how to prepare such a nano tungsten needle? Differing from the traditional methods, the experts have proposed a new method for preparing nano tungsten needles:

Tungsten needle is widely used as a probe for applications of scanning tunneling microscope (STM) - an instrument for imaging surfaces at the atomic level that is recognized as one of the world's top ten scientific and technological achievements in the 1980s.