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One pot aqueous synthesis of l-histidine amino acid capped mn: Zns quantum dots for dopamine sensing

Arunan, R and Joseph, P and Sivakumar, M and Kiruba Daniel, SCG (2020) One pot aqueous synthesis of l-histidine amino acid capped mn: Zns quantum dots for dopamine sensing. In: Current Nanoscience, 16 (1). pp. 71-78.

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Official URL: https://doi.org/10.2174/1573413715666190520093625


Background: Mn doped ZnS is selected as the right element which is prominent among quantum dot for its high luminescent and quantum yield property and also non toxicity while comparing with other organometallic quantum dot synthesized by using different capping agents. Methods: An interesting observation based on colorimetric sensing of dopamine using manganese doped zinc sulfide quantum dot is discussed in this study. Mn doped ZnS quantum dot surface passivated with capping agents such as L-histidine and also in polymers like chitosan, PVA and PVP were studied and compared. The tunable fluorescence effect was also observed in different polymers and amino acid as capping agents. Optical characterization studies like UV-Visible spectroscopy and PL spectroscopy have been carried out. The functional group modification of Quantum dot has been analyzed using FTIR and size and shape analysis was conducted by using HRTEM image. Results: The strong and broad peak of FTIR in the range of 3500-3300 cm-1 confirms the presence of O-H bond. It is also observed that quenching phenomena in the luminescent peak are due to weaker confinement effect. The average size of the particle is shown to be around 4-5 nm. Changes in color of the quantum dot solution from transparent to dark brown has been due to the interaction with dopamine. Conclusion: Finally, L-Histidine amino acid capped Mn:ZnS shows better results in luminescence and size confinement properties. Hence, it was chosen for dopamine sensing due to its colloidal nature and inborn affinity towards dopamine, a neurotransmitter which is essential for early diagnosis of neural diseases. © 2020 Bentham Science Publishers.

Item Type: Journal Article
Publication: Current Nanoscience
Publisher: Bentham Science Publishers
Additional Information: The copyright for this article belongs to Bentham Science Publishers.
Keywords: Amines; Amino acids; Diagnosis; Fluorescence; Fourier transform infrared spectroscopy; II-VI semiconductors; Manganese compounds; Nanocrystals; Neurophysiology; Organometallics; Particle size analysis; Plasma confinement; Polymers; Quenching; Sols; Sulfur compounds; Ultraviolet visible spectroscopy; Zinc sulfide, Aqueous synthesis; Capping agent; Colorimetric sensing; Confinement effects; Dopamine; Optical characterization; Quenching phenomena; UV visible spectroscopy, Semiconductor quantum dots, amino acid; dopamine; histidine; manganese; neurotransmitter; organometallic compound; quantum dot; zinc sulfide, absorption spectroscopy; Article; brain function; capping phenomenon; dopaminergic transmission; Fourier transform infrared spectroscopy; human; nanotechnology; neurotransmission; one pot synthesis; photoluminescence; priority journal; transmission electron microscopy; ultraviolet visible spectroscopy
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited: 08 Feb 2023 11:08
Last Modified: 08 Feb 2023 11:08
URI: https://eprints.iisc.ac.in/id/eprint/80084

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