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Vol. 31 No. 12 (2019): Vol 31 Issue 12

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Microwave Assisted Synthesis and Optical Properties of Highly Fluorescent N-Doped Carbon Dots

https://doi.org/10.14233/ajchem.2019.22334
D. Koteswararao
Department of Chemistry, Jawaharlal Nehru Technological University, Hyderabad-500085, India & Department of Chemistry, Dr. B.R. Ambedkar Open University, Hyderabad-500033, India
https://orcid.org/0000-0002-6054-7783
B. Rajkumar
Department of Chemistry, Osmania University, Hyderabad-500007, India
K. Prameela
Department of Chemistry, Dr. B.R. Ambedkar Open University, Hyderabad-500033, India
K. Ashok
Dhruvtara Chemicals Pvt. Ltd., #G1 Seven Hills Moon Apts, Snehapuri Colony, Hyderabad-500076, India
G. Sridevi
Dhruvtara Chemicals Pvt. Ltd., #G1 Seven Hills Moon Apts, Snehapuri Colony, Hyderabad-500076, India

Corresponding Author(s) : G. Sridevi

drsridevikalyani@gmail.com

Asian Journal of Chemistry, Vol. 31 No. 12 (2019): Vol 31 Issue 12

Abstract

Herein, a rapid microwave assisted solid state method is reported for the synthesis of highly fluorescent N-doped carbon dots (NCDs) using citric acid as carbon source and guanidine hydrochloride as N-dopant. Synthetic parameters such as microwave power, irradiation time and reactants ratio were optimized to produce high quality N-doped carbon dots. The N-doped carbon dots were well characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), SEM-EDS, FTIR, UV-visible and fluorescence spectroscopies. N-Doped carbon dots exhibited bright emission with a quantum yield of 11 %. Detailed study of their optical properties revealed their excellent property of resistance to photo bleaching, high ionic strength and solution pH. Further they exhibited excitation dependent emission behaviour, high aqueous solubility and a long shelf life of 60 days. This strong fluorescence emission combined with high stability make N-doped carbon dots a promising fluorescent probe for wide range of applications.

Keywords

N-Doping Carbon dots Citric acid Guanidine hydrochloride Fluorescence
Koteswararao, D., Rajkumar, B., Prameela, K., Ashok, K., & Sridevi, G. (2019). Microwave Assisted Synthesis and Optical Properties of Highly Fluorescent N-Doped Carbon Dots. Asian Journal of Chemistry, 31(12), 2897–2902. https://doi.org/10.14233/ajchem.2019.22334
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