Nano tungsten oxide with core-shell structure refers to the structure in which a shell or cladding layer is formed on the surface of tungsten oxide nanoparticles. The core-shell structure usually consists of two parts: a core part and a shell covering the surface of the core.
In the nano-tungsten oxide with core-shell structure, the core part is the nanoparticles of tungsten oxide, and the shell layer is a thin layer formed by other materials covering the surface of the core. The presence of a shell can endow nanoparticles with additional functionality or modify their surface properties. The design of the core-shell structure can achieve the following goals:
Protective Shell
The core-shell structure can provide a protective shell to prevent the tungsten oxide core from being oxidized, corroded or dissolved by the external environment. This can improve the stability and longevity of the nanoparticles in long-term use.
Optical Performance Regulation
The core-shell structure can tune the optical properties of nanoparticles by choosing suitable cladding materials. For example, materials with specific optical properties can be used as shells to change the absorption, emission or scattering spectra of nanoparticles, thereby realizing the regulation of optical properties.
Functional Enhancement
The core-shell structure can introduce other functional materials as the shell, endowing nanoparticles with additional functions. For example, catalysts, sensor materials, or fluorescent probes can be incorporated into the shell to achieve enhanced performance of nanoparticles in fields such as catalysis, sensing, or bioimaging.
Control Release Behavior
Controlled release of materials inside nanoparticles can be achieved by adjusting the design and material selection of the core-shell structure. This has important implications for applications such as drug delivery, drug-loaded nanoparticles, or catalyst release in chemical reactions. Different synthesis strategies can be used to prepare nano-tungsten oxide with core-shell structure. Common methods include solvothermal method, deposition method, gel method and layer-by-layer assembly method, etc. During the synthesis process, the controlled growth of the core-shell structure can be achieved by selecting appropriate core materials and shell materials, as well as adjusting reaction conditions and surface interactions. In this way, nano-tungsten oxide particles with a core-shell structure can be obtained, and the interface properties and interactions between the core and the shell can be controlled.
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