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Cadmium sulfide quantum dots (CDS) are a new kind of wide-band radiation nanoparticles

wallpapers News 2021-04-29
Cadmium sulfide quantum dots (CDS) are a new kind of wide-band radiation nanoparticles
CdS quantum dots (CdS) are a new type of wide-band radiant nanoparticles with a direct bandgap of 2.4eV, which are widely used in solar cells. Photochromic switch molecules have a tendency to reversibly convert between two isomers when exposed to electromagnetic radiation. Common processes include cis-trans isomerization, circum-loop, open-loop/closed-loop, proton transfer, electron transfer, etc. These processes alter the electronic structure of photochromic molecules and modulate their properties at the molecular level, such as geometry, dipole moments and absorption coefficients.
By taking advantage of the above photochromic switch and the properties of quantum dots (such as azobenzene and CdS quantum dots), we designed a photochromic quantum dot assembly to regulate the fluorescence of quantum dots. We call the photochromism-quantum dot assembly photochromism-quantum dot binary. These intriguing systems work on the principle that energy or electrons are transferred from a light-excited quantum dot to one of the interchangeable states of a photochromic switch, regulating its emission. The study of photochromic fluoro groups focuses on the binding of organic ligands (photochromic switches) to inorganic nanoparticles/quantum dots. In these systems, the luminescent behavior of the fluorophore is modulated by energy or electron transfer from the inorganic nanoparticles to one of the photochromic photoswitch isomers.
As far as we know, the azobenzene photochromic switch is the fluorescent modulation of CdS quantum dots. Two azobenzene derivatives, bis (4-hydroxybenzen-1-azo)4,4 '(1,1' diphenylmethane)(I) and 4,4 '-azobenzoic acid (II), were designed and synthesized. Therefore, we continue to suggest that the photo-induced conversion of azobenzene compounds (I) and (II) from trans to cis modulates the emission behavior of QDs through the conduction of the electron transfer process with the lowest occupied molecular orbital (LUMO) cis isomer of CdS QDs.

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