مشخصات پژوهش

عنوان	Aqueous based synthesis of N-acetyl-L-cysteine capped ZnSe nanocrystals with intense blue emission
نوع پژوهش	مقاله چاپ‌شده
کلیدواژه‌ها	Aqueous-based synthesis ZnSe nanocrystals Strong confinement regime Narrow excitonic emission
چکیده	In this work a very simple reflux route for preparation of ZnSe nanocrystals with minor modification and faster preparation over conventional ones is introduced. X-ray diffraction analysis indicated that the ZnSe nanocrystals have a cubic structure. The complete disappearance of the S-H band in FT-IR spectrum of Nacetyl- L-cysteine capped ZnSe nanocrystals was an indication over formation of Zn-thiol covalent bonds at the surface of the nanocrystals which results in passivation of small nanocrystals. The strong sizequantization regime was responsible of significant blue shift in absorption/emission spectra. Using the well-known calculations, band gap and Urbach energy of the ZnSe nanocrystals were measured and their average size was estimated optically to be around 4.6 nm along with the TEM image. A dark blue emission with higher relative intensity of excitonic to trap emissions (compared to conventional method), very narrow excitonic emission peak of about 16 nm and remarkable stability was obtained from the ZnSe nanocrystals
پژوهشگران	غلامرضا نبیونی (نفر سوم)، رضا صحرایی (نفر دوم)، احسان سهیلی (نفر اول)