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Today, let's share about nanocrystals

by:Transmart     2022-08-07

Nanocrystals refer to crystalline materials on the nanometer scale, or nanoparticles with a crystalline structure. Nanocrystals are of great research value. The electrical and thermodynamic properties of nanocrystals exhibit strong size dependence, allowing these properties to be controlled through careful fabrication processes. Nanocrystals can provide crystal structures of monomers, and studying the crystal structures of these monomers can provide information to explain the behavior of macroscopic samples of similar materials, regardless of complex grain boundaries and other crystal defects. Semiconductor nanocrystals smaller than 10 nanometers in size are often referred to as quantum dots. Definition: Nanocrystals refer to single-phase or complex-phase polycrystals composed of crystal grains with a size of 1 to 10 nm [1]. Crystal structure The structural feature of this crystal is that the atoms on its grain boundaries account for 50% of the total number of atoms in the crystal. The number of grain boundaries in nanocrystals is about 10 grain boundaries/cm. Principle: In such a huge number of grain boundaries (or phase boundaries), the atoms at the core are constrained by adjacent lattices to form a certain arrangement configuration, which is different from the arrangement of atoms in the crystal (the atomic arrangement in the grain). ) is different from the amorphous state, but hooks into a new configuration. It is a three-dimensional ordered structure with its own periodic law and atomic spacing, and different grain boundaries are different from each other. There are 10 atomic configurations in 10 grain boundaries in a 1cm nanocrystal. This is because the orientation of each grain is different, and the size and direction of the binding force acting on the atoms at the core of the surrounding grain boundary by the grains with different orientations are different. , resulting in different atomic arrangements and configurations [2]. Grain boundary phase: The atoms on the grain boundary (or phase boundary) are also called the grain boundary phase (or phase boundary phase). The new properties of nanocrystals mainly come from the special arrangement of atoms on the grain boundary phase (or phase boundary phase). The new configuration of the atomic arrangement of the core part on the grain boundary (or phase boundary) brings new properties to nanocrystals, which are usually prepared by gas-phase induced condensation [3].
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