Abstract
CdS nanoparticles have a great potential for application in chemical research, bioscience and medicine. The aim of this study was to develop an efficient and environmentally-friendly method of plant-based biosynthesis of CdS quantum dots using hairy root culture of Linaria maroccana L. By incubating Linaria root extract with inorganic cadmium sulfate and sodium sulfide we synthesized stable luminescent CdS nanocrystals with absorption peaks for UV-visible spectrometry at 362 nm, 398 nm and 464 nm, and luminescent peaks at 425, 462, 500 nm. Transmission electron microscopy of produced quantum dots revealed their spherical shape with a size predominantly from 5 to 7 nm. Electron diffraction pattern confirmed the wurtzite crystalline structure of synthesized cadmium sulfide quantum dots. These results describe the first successful attempt of quantum dots synthesis using plant extract.PACS81.07.Ta; 81.16.-c; 81.16.Rf
Highlights
Nanometer-sized binary chalcogenides belonging to the groups II–VI semiconductors such as CdS, PbS, ZnS, CdSe, PbSe, etc. have attracted considerable attention due to their unique if compared to their bulk counterparts properties related to the size quantization effects [1]
Transmission electron microscopy analysis allowed to investigate the shape of produced CdS nanoparticles and their size distribution
In addition according to electron microscopy data, it was established that synthesized nanoparticles were elliptic or spherical in shape and did not have significant surface defects
Summary
Nanometer-sized binary chalcogenides belonging to the groups II–VI semiconductors such as CdS, PbS, ZnS, CdSe, PbSe, etc. have attracted considerable attention due to their unique if compared to their bulk counterparts properties related to the size quantization effects [1]. Nanometer-sized binary chalcogenides belonging to the groups II–VI semiconductors such as CdS, PbS, ZnS, CdSe, PbSe, etc. Many physical properties of nanostructured semiconductors depend strongly on their size, shape and crystal structure. CdS has a Bohr radius of 2.4 nm and direct band gap of 2.4 eV3 and is used in photovoltaics, in light-emitting diodes for flat-panel displays, and in other optical devices based on its nonlinear properties [3]. CdS has been extensively studied recently [4,5]. Such quantum dots (QDs) have significant advantages in chemical and biological researches in contrast to the problem concerning potential toxicity of II-IV QDs (such as CdS or CdSe) has cast doubts on their practical use in medicine. For biological studies QDs should be water soluble in order to adapt the biological environment [7]
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