Monthly Archives - November 2019

Laser technology opens up a new way to synthesize quantum dots

Recently, professor duhiwen’s team developed a new process for synthesizing monodisperse quantum dots, which is environmentally friendly and efficient. The results were published in Nature Communications, which is the world’s first report on synthesizing monodisperse quantum dots by physical method. Quantum dots, also known as semiconductor nanocrystals, are nanoparticles made up of ii-vi or iii-v elements. Quantum dot size, generally between 1 ~ 10 nm, due to the electrons and holes is strongly restricted in small volume, the quantum dot [...]

The institute of intelligence of Chinese Academy of Sciences introduced the up-conversion luminescent materials into SERS detection

Recently, researcher Yang liangbao and others of liu jinhuai research group of intelligent institute introduced up-conversion luminescent materials into surface-enhanced Raman spectroscopy (SERS) research, and realized the SERS detection with high sensitivity under long wavelength and low energy laser, which was of great significance to the application of SERS technology in practical detection. The results have been published in materials chemistry A and analysts of the royal society of chemistry. In recent years, SERS technology has attracted much attention due [...]

Upconversion nanoparticles convert infrared light into ultraviolet and visible light

Researchers from the department of bioengineering at the national university of Singapore’s school of engineering have developed a new technique that can convert infrared light into ultraviolet and visible light using nanoparticles, paving the way for non-invasive treatments for deep tumors, physicists group reported. The technique, which claims to inhibit tumor growth and control gene expression, is the world’s first non-invasive photodynamic therapy to treat deep tumors with nanoparticles. The paper appears in a recent issue of the journal [...]

Secondary tin and recycled tin will dominate the industry in the future

Tin is one of ten commonly used non-ferrous metals. At present, tin is mainly used in electronic solder, tinplate, tin chemical industry, tin alloy, float glass, tin handicraft and other industries. Tin applications in the electronics industry is mainly tin solder, used in electronic welding, the field currently accounts for 70 percent of China’s tin downstream application, in addition to tinplate and tin chemical products accounted for 8 percent and 12 percent of the downstream application. Tin is closely related [...]

Common synthetic method for preparing aluminum nitride powder

Currently, there are many methods to prepare aluminum nitride powder, such as direct nitriding of aluminum powder, carbonothermic reduction of alumina, sol, self-tensioning, plasma synthesis, decomposition of polymer containing ALN bond, chemical vapor deposition, water-induced solid phase reaction, sol-gel method, etc. The following small series for you to introduce the aluminum nitride powder commonly used synthesis. 1) direct nitriding of aluminum powder ALN+N2→2ALN put aluminum powder into the reaction furnace filled with nitrogen and ammonia reaction to heat to 600℃ to [...]