title: Aqueous synthesis of highly stable CdTe/ZnS Core/Shell quantum dots for bioimaging.
abstract: In this work, we report the synthesis, characterization and biological application of highly stable CdTe/ZnS (cadmium tellurite/zinc sulphide) Core/Shell (CS) quantum dots (QDs) capped with mercaptosuccinic acid (MSA). The CS QDs were synthesized using a simple one-pot aqueous method. The synthesized CdTe/ZnS CS QDs were found to exhibit excellent stability even 100 days after preparation and also showed better photoluminescence quantum yield (PLQY) of about 50% compared with that of only CdTe QDs which was nearly 12%. The formation of the CdTe/ZnS CS was confirmed by high-resolution transmission electron microscopy (HR-TEM), and Fourier transform infra-red (FTIR) and X-ray diffraction (XRD) analyses. Further, on extending our study towards bioimaging of E. coli cells using the QDs samples, we found that CdTe/ZnS CS QDs showed better results compared with CdTe QDs.
authors: Physical Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India.
authors: D
authors: D
authors: Saikia
authors: Physical Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India.
authors: S
authors: S
authors: Chakravarty
authors: Physical Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India.
authors: N S
authors: NS
authors: Sarma
authors: Department of Applied Sciences, Institute of Science and Technology, Gauhati University, Guwahati, Assam, India.
authors: S
authors: S
authors: Bhattacharjee
authors: Department of Electronics and Communication Technology, Gauhati University, Guwahati, Assam, India.
authors: P
authors: P
authors: Datta
authors: Physical Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India.
authors: N C
authors: NC
authors: Adhikary
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D002478:Cells, Cultured; D004926:Escherichia coli / Q000166:cytology*; D008163:Luminescent Measurements; D045663:Quantum Dots; D013440:Sulfides / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D013440:Sulfides; D017967:Zinc Compounds; D014867:Water; C031238:zinc sulfide; D013691:Tellurium; C028337:cadmium telluride
keywords: aqueous synthesis; bioimaging; quantum dot; stability