کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11008824 1840431 2018 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
One-pot synthesis of highly fluorescent amino-functionalized graphene quantum dots for effective detection of copper ions
ترجمه فارسی عنوان
سنتز یک گلدان از نقاط کوانتومی گرافن به صورت بسیار فلورسنت آمینواسایزر برای تشخیص موثر یونهای مس
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی
In this work, a green and simple one-pot route was developed for the synthesis of highly fluorescent amino-functionalized graphene quantum dots (a-GQDs) via hydrothermal process without any further modification or surface passivation. We synthesized the a-GQDs using glucose as the carbon source and ammonium as a functionalizing agent without the use of a strong acid, oxidant, or other toxic chemical reagent. The as-obtained a-GQDs have a uniform size of 3-4 nm, high contents of amino groups, and show a bright green emission with high quantum yield of 32.8%. Furthermore, the a-GQDs show effective fluorescence quenching for Cu2+ ions which can serve as effective fluorescent probe for the detection of Cu2+. The fluorescent probe using the obtained a-GQDs exhibits high sensitivity and selectivity toward Cu2+ with the limit of detection as low as 5.6 nM. The mechanism of the Cu2+ induced fluorescence quenching of a-GQDs can be attributed to the electron transfer by the formation of metal complex between Cu2+ and the amino groups on the surface of a-GQDs. These results suggest great potential for the simple and green synthesis of functionalized GQDs and a practical sensing platform for Cu2+ detection in environmental and biological applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 18, Issue 11, November 2018, Pages 1255-1260
نویسندگان
, ,