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首页> 外文期刊>RSC Advances >Nanocrystals of Zn(Fe)O-based diluted magnetic semi-conductor as potential luminescent and magnetic bimodal bioimaging probes
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Nanocrystals of Zn(Fe)O-based diluted magnetic semi-conductor as potential luminescent and magnetic bimodal bioimaging probes

机译：Zn（Fe）O基稀磁半导体的纳米晶体作为潜在的发光和磁性双峰生物成像探针。

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Nanocrystals of Zn(Fe)O-based diluted magnetic semi-conductor (nanoDMS) have been prepared by forced hydrolysis in polyol medium, using zinc and iron salts, and coated with carboxymethylpullulan (CMP). TEM studies revealed that CMP-nanoDMS are spherical, with average diameters on the order of 20 nm. Hydrodynamic diameters of about 75 nm were found in a physiological medium. NanoDMS were superparamagnetic at body temperature, and exhibited high saturation magnetization values (3.25 emu g(-1)). In aqueous suspensions, the colloids revealed high transverse proton relaxivities (T-2) with an r(2) value of 203 mM(-1) s(-1) (300 K, 1.41 T). Visible photoluminescent properties were evidenced with an excitation wavelength of 366 nm. No evidence of cell toxicity was found for human endothelial cells incubated with CMP-nanoDMS, at concentrations up to 100 mu g mL(-1) and for 48 h. No modification to the cytoskeleton was found up to 6 days of exposure. These hybrid nanomaterials could be considered as novel potential MR and luminescent bioimaging agents.
机译：通过在多元醇介质中使用锌和铁盐强制水解，制备了基于Zn（Fe）O的稀释磁性半导体（nanoDMS）纳米晶体，并涂有羧甲基普鲁兰（CMP）。 TEM研究表明，CMP-nanoDMS是球形的，平均直径约为20 nm。在生理介质中发现约75 nm的流体力学直径。 NanoDMS在体温下是超顺磁性的，并表现出高饱和磁化强度值（3.25 emu g（-1））。在水性悬浮液中，胶体显示出较高的横向质子弛豫性（T-2），r（2）值为203 mM（-1）s（-1）（300 K，1.41 T）。激发波长为366 nm，可见光致发光性能。对于浓度高达100μg mL（-1）持续48 h的CMP-nanoDMS培养的人内皮细胞，未发现细胞毒性的证据。暴露至6天未发现细胞骨架发生任何改变。这些杂化纳米材料可以被认为是新型潜在的MR和发光生物成像剂。

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