Green and Cost Effective Synthesis of Fluorescent Carbon Quantum Dots for Dopamine Detection |
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Authors: | D. Bharathi B. Siddlingeshwar R. Hari Krishna Vikram Singh Nagaraju Kottam Darshan Devang Divakar Abdulaziz Abdullah Alkheraif |
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Affiliation: | 1.Department of Physics,M. S. Ramaiah Institute of Technology,Bengaluru,India;2.Department of Chemistry,M. S. Ramaiah Institute of Technology,Bengaluru,India;3.Department of Chemistry,Indian Institute of Technology Madras,Chennai,India;4.Dental Biomaterials Research Chair, Dental Health Department, College of Applied Medical Sciences,King Saud University,Riyadh,Kingdom of Saudi Arabia |
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Abstract: | Carbon quantum dots (CQDs) due to its high fluorescent output is evolving as novel sensing material and is considered as future building blocks for nano sensing devices. Hence, in this investigation we report microwave assisted preparation and multi sensing application of CQDs. The microwave derived CQDs are characterized by Dynamic Light Scattering (DLS) experiment and Fourier Infrared spectra (FTIR) to investigate the size distribution and chemical purity respectively. Fluorescent emission spectra recorded at varying pH shows varying fluorescence emission intensities. Further, emission spectra recorded at different temperatures shows that fluorescence emission of CQDs greatly depends on temperature. Therefore, we demonstrate the pH and temperature sensing characteristics of CQDs by fluorescence quenching behaviour. In addition, the interaction and sensing behaviour of CQDs for dopamine is also presented in this work with a detection limit of 0.2 mM. The steady state and time-resolved methods have been employed in fluorescence quenching methods for sensing dopamine through CQDs at room temperature. The bimolecular quenching rate constants for different concentration have been measured. The interaction between CQDs and dopamine indicates fluorescence quenching method is an elegant process for detecting dopamine through CQDs. |
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