مشخصات پژوهش

عنوان	Construction of a novel "Off-On" fluorescence sensor for highly selective sensing of selenite based on europium ions induced crosslinking of nitrogendoped carbon dots
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Europium ions Selenite Nitrogen-doped carbon dots Off-On probe
چکیده	A highly blue luminescent nitrogen-doped carbon dots (N-CDs) was prepared, using citric acid and L-lysine via one pot hydrothermal treatment, and applied to the determination of selenite. The synthesized N-CDs exhibited a high photostability, excellent optical features with a high quantum yield (21.5%) and average size of 3 nm. The method is based on the competition between oxygen donor atoms in selenite oxyanion with those from carboxylate and hydroxyl groups at the surface of N-carbon dots for europium ions binding. N-CDs could be readily quenched upon the addition of europium ions owing to high affinity of carboxylate and hydroxyl groups at the surface of carbon dots to Eu3+ leading to aggregation of N-CDs (state OFF). After selenite addition, disruption of the aggregated N-CDs takes place, leading to restoration of the quenched fluorescence (State ON). The repeatability was less than 3.2% for selenite in both standard and real samples (n = 3). The method provides a simple procedure enabled selective detection of selenite with a linear range of 0.078–21.4 μg mL−1 and a limit of detection of 53.0 ng mL−1 (S/N = 3). The accuracy and precision were evaluated based on the detection of selenite in health care products with satisfactory results.
پژوهشگران	نیلوفر امین (نفر اول)، عباس افخمی عقداء (نفر دوم)، طیبه مدرکیان (نفر سوم)