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首页> 外文期刊>RSC Advances >Sodium-alginate biopolymer as a template for the synthesis of nontoxic red emitting Mn2+-doped CdS nanoparticles
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Sodium-alginate biopolymer as a template for the synthesis of nontoxic red emitting Mn2+-doped CdS nanoparticles

机译：海藻酸钠生物聚合物为模板，合成无毒的发红光的Mn 2 + 掺杂CdS纳米粒子

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Manganese-doped cadmium sulfide (CdS:Mn) nanoparticles were prepared by chemical synthesis using sodium-alginate as template. The preparation of the nanocomposites involved ionic crosslinking of the biopolymer by dimerization of its α-L-guluronic monomers with Cd2+ and subsequent formation of the semiconductor nanoparticles upon addition of sulfide ions in the presence of Mn2+. The crystalline phase of CdS in the material was confirmed by XRD. The surface morphology of the nanocomposites was investigated by SEM. The observation by TEM showed that the CdS:Mn particles were spherical in shape with diameters of approximately 4 nm. EPR measurements of the CdS:Mn-alginate nanocomposite showed that the Mn2+ ions were incorporated in cationic sites of CdS with lower symmetry. Due to a distorted crystal field induced by the Mn2+ ions, photoluminescence spectra of the CdS:Mn-alginate showed red fluorescence between 650 nm and 750 nm falling into the optical window for bioimaging in which the light has its maximum tissue penetration depth. It was demonstrated that the interaction between the nanoparticles and the matrix prevents release of CdS into the environment, leading to low acute toxicity of the nanocomposites.
机译：以藻酸钠为模板，通过化学合成制备了锰掺杂的硫化镉（CdS：Mn）纳米颗粒。纳米复合材料的制备涉及生物聚合物的离子交联，方法是将其α- L -古洛糖醛酸酯单体与Cd 2 + 二聚化，然后形成Mn 2 + 存在下添加硫化物离子制备半导体纳米粒子。通过XRD确认材料中CdS的结晶相。通过SEM研究了纳米复合材料的表面形态。 TEM的观察表明，CdS：Mn颗粒为球形，直径约为4nm。 CdS：Mn-藻酸盐纳米复合材料的EPR测量表明，Mn 2 + 离子以较低的对称性掺入CdS的阳离子部位。由于Mn 2 + 离子引起的畸变晶体场，CdS：Mn-藻酸盐的光致发光光谱显示出650 nm至750 nm之间的红色荧光落入光生物成像窗口，其中光具有其最大的组织穿透深度。结果表明，纳米颗粒与基质之间的相互作用阻止了CdS释放到环境中，导致纳米复合材料的急性毒性较低。

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