کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7840160 | 1505864 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Concentration effect on optical properties of carbon dots at room temperature
ترجمه فارسی عنوان
اثر غلظت بر خواص نوری نقاط کربن در دمای اتاق
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کلمات کلیدی
نقطه کربن، فوتولومینسانس، انرژی سطح
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
Carbon dots are interesting fluorescent nanoparticles to study due to their excelent optical properties and potential applications. However, further exciton study must be done to reveal luminescent origin. In this work, we present exciton dynamic study of carbon dots at room temperature. The carbon dots sample was synthesized from commercial sugar using simple microwave-assisted technique. Photoluminescence study was carefully done using various techniques, such as down and up conversion photoluminescence, time-resolved photoluminescence. Additional measurement such as absorbance spectroscopy and transmission electron microscope (TEM) were utilized. From TEM image, we found that carbon dots have lattice constant approximately 2.94 Angstrom. Furthermore, we can distinguish energy transition in carbon dots, such as core and surface energy, using absorbance and photoluminescence spectra. We found that surface energy become dominant as carbon dots concentration increase. Higher carbon dots concentration shift surface energy of carbon dots. However, this shift was not observed in up-conversion photoluminescence.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 198, June 2018, Pages 215-219
Journal: Journal of Luminescence - Volume 198, June 2018, Pages 215-219
نویسندگان
Isnaeni Isnaeni, Yuliati Herbani, Maria Margaretha Suliyanti,