Sodium-alginate biopolymer as a template for the synthesis of nontoxic red emitting Mn2+-doped CdS nanoparticles
AuthorsKuzmanović, Maja D.
Božanić, Dušan K.
MetadataShow full item record
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 alpha-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 th...e 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.
Source:RSC Advances, 2017, 7, 84, 53422-53432
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- Ministerio de Ciencia e Innovacion [MAT2010-16815], Ministerio de Economia y Competitividad [MAT2014-59116-C2], Fondos de Investigacion de Fco. Javier Gonzalez Benito, politica de reinversion de costes generales, Universidad Carlos III de Madrid [2012/00130/004], Accion Estrategica en Materiales Compuestos Polimericos e Interfases, Universidad Carlos III de Madrid [2011/00287/002], TECHNOFUSION(II)-CM Spain [S2013/MAE-2745], University Carlos III Madrid via Ayudas al studio de Master Universitario, University Carlos III Madrid