Sreenu Bhanoth; Anuraj Kshirsagar; Pawan K Khanna; Aakriti Tyagi; Ankita Leekha; Vijay Kumar; Anita Verma
Abstract
Present article describes one-pot, two-stage, in-situ controlled atmosphere method for synthesis of core-shell quantum dots (QDs) comprising of ZnSe, CdS and CdSe combinations e.g. CdS/CdSe, ZnSe/CdS and ZnSe/CdSe. The present method emphasizes on creating an effective surface passivation of core as ...
Read More
Present article describes one-pot, two-stage, in-situ controlled atmosphere method for synthesis of core-shell quantum dots (QDs) comprising of ZnSe, CdS and CdSe combinations e.g. CdS/CdSe, ZnSe/CdS and ZnSe/CdSe. The present method emphasizes on creating an effective surface passivation of core as well as formation of passivated shell via utilization of cyclo-octeno-1, 2, 3-selenadiazole as a precursor for selenium. Synthesis of ZnSe/CdS was compared by using two different selenium precursors viz cyclo-octeno-1, 2, 3-selenadiazole (C8-SDZ) and cyclo-hexeno-1, 2, 3-selenadiazole (C6-SDZ). Optical properties (UV-Visible and PL spectroscopy) indicate narrow peak width with band gap ranging in between 2.30 eV to 2.56 eV. The XRD analysis revealed the formation of respective core-shell QDs with zinc blende crystal structure. TEM analysis showed formation of spherical shaped core-shell QDs with lattice spacing of 0.35 nm due to presence of (111) crystal plane. By virtue of the excellent optical properties of ZnSe/CdS core shell QDs, this was subjected to bio-evaluation in terms of cytotoxicity and therapeutic efficacy. Approximately, 65% bio-toxicity was observed in MCF-7 with negligible haemolysis by ZnSe/CdS QDs. About, 34% tumour regression was shown by ZnSe/CdS QDs, as against 93% observed by Mitomycin C (Positive control) with respect to placebo (PBS).
Suraksha Rasal; Sunita Jadhav;Pawan K. Khanna; Priyesh V. More; Chaitanya Hiragond
Abstract
ZnO/CdS core-shell hetero nanostructures with different shell thickness have been successfully developed by a solution chemistry method employing rapid homogenization concept. The obtained core/shell nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy ...
Read More
ZnO/CdS core-shell hetero nanostructures with different shell thickness have been successfully developed by a solution chemistry method employing rapid homogenization concept. The obtained core/shell nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDX), FTIR, Raman, photoluminescence (PL), and UV-visible spectroscopy. All analytical and spectroscopic tools supported the formation of CdS shell over ZnO core. ZnO/CdS core-shell nanostructures were evaluated for their photocatalytic activity against methylene blue (MB), a common industrial water pollutant. It was observed that the ZnO/CdS core-shell nanostructures can effectively function as a photocatalyst under both UV and sunlight for degradation of MB. It was also observed that the degradation of MB was higher from core/shell nanostructures than the physical mixture of ZnO-CdS which was prepared separately.
