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Báo cáo hóa học: "Synthesis and Spectral Studies of CdTe–Dendrimer Conjugates"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and Spectral Studies of CdTe–Dendrimer Conjugates | Nanoscale Res Lett 2009 4 937-941 DOI 10.1007 S11671-009-9339-1 NANO EXPRESS Synthesis and Spectral Studies of CdTe-Dendrimer Conjugates Srabanti Ghosh Abhijit Saha Received 1 April 2009 Accepted 5 May 2009 Published online 22 May 2009 to the authors 2009 Abstract In order to couple high cellular uptake and target specificity of dendrimer molecule with excellent optical properties of semiconductor nanoparticles the interaction of cysteine-capped CdTe quantum dots with dendrimer was investigated through spectroscopic techniques. NH2-terminated dendrimer molecule quenched the photoluminescence of CdTe quantum dots. The binding constants and binding capacity were calculated and the nature of binding was found to be noncovalent. Significant decrease in luminescence intensity of CdTe quantum dots owing to nonco-valent binding with dendrimer limits further utilization of these nanoas semblies. Hence an attempt is made for the first time to synthesize stable highly luminescent covalently linked CdTe-Dendrimer conjugate in aqueous medium using glutaric dialdehyde G linker. Conjugate has been characterized through Fourier transform infrared spectroscopy and transmission electron microscopy. In this strategy photoluminescence quantum efficiency of CdTe quantum dots with narrow emission bandwidths remained unaffected after formation of the conjugate. Keywords Quantum dots Dendrimer Conjugate Infrared spectroscopy Luminescence Introduction Rapid advances in nanotechnology and nanoscience have spurred interests in developing a variety of nanostructured materials. In this context semiconductor nanoparticles also S. Ghosh A. Saha H UGC-DAE Consortium for Scientific Research Kolkata Centre III LB-8 Bidhannagar Kolkata 700098 India e-mail abhijit@alpha.iuc.res.in known as quantum dots are the most promising ones due to their high photochemical stability and size-tunable photoluminescence 1 . Quantum dots QDs in particular have potential applications in optoelectronics biosensing .