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The difference between nanoparticles and quantum dots

wallpapers News 2021-01-25
Nanoparticles are particles with a particle size between 1 and 100 nm (nanoparticles are also called ultrafine particles). It belongs to the category of colloidal particle size. Quantum dots are semiconductor nanostructures that bind excitons in three spatial directions. Nanoparticles are only on the nanometer scale in particle size. In addition to the volume of quantum dots at the nanometer level, the key is to reflect the "quantum" effect.

Nanoparticles and quantum dots have different characteristics
Nanoparticles: Located in the transition zone between clusters of atoms and macroscopic objects, between the microscopic system and the macroscopic system, it is a group composed of a small number of atoms or molecules. Therefore, it is neither a typical microsystem nor a typical macro system. Quantum dots: energy spectrum with separate quantization. The corresponding wave function is spatially located in the quantum dot, but extends over several lattice periods. A quantum dot has a small number of integers of electrons, holes, or electron-hole pairs. That is, the amount of electricity it carries is an integer of elementary charges.
Nanoparticles and quantum dots have different applications
Nanoparticles: Using nanoparticles for catalytic reactions can directly use nanoparticles such as platinum black, silver, alumina, iron oxide, etc., as catalysts in the oxidation, reduction, and synthesis reactions of high molecular polymers, which can greatly improve the reaction efficiency. Using nano-nickel powder as the rocket solid fuel reaction catalyst, the combustion efficiency can be increased by 100 times. The catalytic reaction also shows selectivity. Quantum dots: Many modern luminescent materials and devices are composed of semiconductor quantum structures. The size of quantum dots formed by the materials are close to the size of fuel molecules commonly used in the past, so they are very useful for biomedical research like fluorescent dyes. Quantum dots can also be regarded as a kind of nanoparticles. The most direct result of making a semiconductor into such a small size is to be able to generate separate energy levels, thereby generating light of a specific frequency. Quantum dots are mostly used as light sources.

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