Fluorescent magnetic hybrid nanoprobe for multimodal bioimaging.

Fluorescent magnetic hybrid nanoprobe for multimodal bioimaging.
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DOI:
10.1088/0957-4484/22/27/275606
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发表时间:
2011-07-08
期刊:
影响因子:
3.5
通讯作者:
Pham W
Pham W
中科院分区:
材料科学3区
文献类型:
--
作者:
Koktysh D;Bright V;Pham W

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A fluorescent magnetic hybrid imaging nanoprobe (HINP) was fabricated by conjugation of superparamagnetic Fe3O4 nanoparticles and visible light-emitting (~600 nm) fluorescent CdTe/CdS quantum dots (QDs). The assembly strategy used the covalent linking of the oxidized dextran shell of magnetic particles to the glutathione ligands of QDs. Synthesized HINP formed stable water-soluble colloidal dispersions. The structure and properties of the particles were characterized by transmission electron and atomic force microscopy, energy dispersive X-ray analysis and inductively coupled plasma optical emission spectroscopy, dynamic light scattering analysis, optical absorption and photoluminescence spectroscopy, and fluorescent imaging. The luminescence imaging region of the nanoprobe was extended to the near-infrared (NIR) (~800 nm) by conjugation of superparamagnetic nanoparticles with synthesized CdHgTe/CdS QDs. Cadmium, mercury based QDs in HINP can be easily replaced by novel water soluble glutathione stabilized AgInS2/ZnS QDs to present a new class of cadmium-free multimodal imaging agents. Observed NIR photoluminescence of fluorescent magnetic nanocomposites supports their use for bioimaging. The developed HINP provides dual-imaging channels for simultaneous optical and magnetic resonance imaging.
磁性流体前驱体磁铁矿/葡聚糖纳米复合材料的制备及表征
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