Fe3O4/CdSe/ZnS magnetic fluorescent bifunctional nanocomposites
Магнитные флуоресцентные бифункциональные нанокомпозиты Fe3O4/CdSe/ZnS
2006-05-26
SCID: 54.1/tk7p9ej4
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Fe3O4/CdSe/ZnS nanocompositesZnS surface passivationmagnetic fluorescent nanocompositesquantum yieldsuperparamagnetic nanoparticles
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Abstract (AI)
Fe 3 O 4 /CdSe/ZnS magnetic fluorescent bifunctional nanocomposites were obtained by depositing heterogeneous semiconductor on magnetic nanoparticles. The structure and properties of the Fe 3 O 4 /CdSe/ZnS nanocomposites were fully characterized by TEM, XPS, XRD, SQUID and PL. The results indicate that the Fe 3 O 4 /CdSe/ZnS nanocomposites are superparamagnetic and are about 8 nm in size. The quantum yield of the nanocomposites increases from 2–3% in Fe 3 O 4 /CdSe to 10–15% in Fe 3 O 4 /CdSe/ZnS, together with a red shift of both the absorption peak and PL band. The increase of quantum yield is due to the passivation of the surface of magnetic-CdSe nanocomposites with a ZnS layer.
Key Findings
1
Adding a ZnS shell increases the quantum yield from 2–3% for Fe3O4/CdSe to 10–15% for Fe3O4/CdSe/ZnS.
2
Fe3O4/CdSe/ZnS nanocomposites were synthesized by depositing heterogeneous semiconductor layers onto magnetic nanoparticles.
3
The enhanced quantum yield is attributed to surface passivation of magnetic-CdSe nanocomposites by the ZnS layer.
4
The nanocomposites are approximately 8 nm in size and exhibit superparamagnetic behavior.
5
ZnS coating causes red shifts in both the absorption peak and photoluminescence band.
Research Object
Fe3O4/CdSe/ZnS magnetic fluorescent bifunctional nanocomposites
Research Subject
The nanocomposites’ structure and optomagnetic properties, including superparamagnetism, size, quantum yield, absorption and photoluminescence shifts, and the effect of ZnS surface passivation
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2006-05-26
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