کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1245645 1495841 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A near-infrared-emitting CdTe/CdS core/shell quantum dots-based OFF–ON fluorescence sensor for highly selective and sensitive detection of Cd2+
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
A near-infrared-emitting CdTe/CdS core/shell quantum dots-based OFF–ON fluorescence sensor for highly selective and sensitive detection of Cd2+
چکیده انگلیسی

A near-infrared-emitting CdTe/CdS core/shell quantum dots (QDs)-based photoluminescence (PL) sensor was designed and applied for highly selective and sensitive detection of Cd2+. This sensor was based on a PL “OFF–ON” mode. First, the addition of ammonium pyrrolidine dithiocarbamate (APDC) led to remarked PL quenching of QDs. Second, PL of APDC surface modified QDs (QDs-APDC) was gradually restored with the each increment of Cd2+ concentration. Experimental results showed that PL of QDs-APDC was near proportional upon the addition of Cd2+ in the range from 0.1 to 2 μM with a good correlation coefficient of 0.9989. The limit of detection of this proposed method was 6 nM. Interferential experiments confirmed that this sensor of Cd2+ was highly selective over other metal ions. To further investigate perfect analysis performance, this sensor was favorably utilized to determine Cd2+ in tap water, river water and liposome solutions.


► A near-infrared-emitting quantum dots-based fluorescence sensor was developed to detect Cd2+.
► This sensor was based on a fluorescence “OFF–ON” mode.
► The limit of detection was 6 nM.
► Interferential experiments confirmed the high selectivity of this sensor.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Talanta - Volume 94, 30 May 2012, Pages 257–262
نویسندگان
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