کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5402520 1392735 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and purification of l-cysteine capped CdTe quantum dots and its self-recovery of degenerate fluorescence
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Preparation and purification of l-cysteine capped CdTe quantum dots and its self-recovery of degenerate fluorescence
چکیده انگلیسی
l-cysteine capped CdTe quantum dots (QDs) were prepared in aqueous solution by a simple and efficient method, showing many advantages such as short synthesis period, the broaden range of starting pH value and the wide fluorescence emission wavelength range. A novel purification process was designed to remove excess Cd2+ which has potential cytotoxicity for bio-analysis. Three-dimensional fluorescence charts of pre- and post-purification showed that the purified QDs were of better luminescent performance. The prepared QDs were of cubic crystal structure with an average size of 2-6 nm, which were characterized by XRD and HRTEM. It is confirmed by IR spectra that the l-cysteine ligands were conjugated with CdTe cores via covalent bond. The degenerate fluorescence of QDs can be self-recovered in the presence of l-cysteine without other processing steps.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 130, Issue 10, October 2010, Pages 1935-1940
نویسندگان
, , , , , , , ,