Curucmin functionalized cadmium selenide quantum dots

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[ VOLUME 6 I ISSUE 2 I APRIL– JUNE 2019] E ISSN 2348 –1269, PRINT ISSN 2349-5138 Curucmin functionalized cadmium selenide quantum dots modified electrode for voltammetric determination of ascorbic acids K. Krishna Kumar, M. Devendiran, S. Sriman Narayanan Department of Analytical Chemistry, School of Chemical Science, University of Madras, Guindy Campus, Chennai, Tamil Nadu, India-600025 Received: January 26, 2019 Accepted: March 10, 2019 ABSTRACT: In this work, green synthesis of cadmium selenide quantum dots using curcumin as a functionalizing agent and fabricating the surface of paraffin wax impregnated graphite electrode using curcumin - cadmium selenide quantum dots, its electrocatalytic application towards oxidation of ascorbic acid are the main objective. The physical properties and surface property of the modifier and modified electrode are characterized using techniques such as UV-Visible spectrophotometry, Raman spectroscopy, high resolution transmittance microscope, selected area electron diffraction. Electrochemical measurement for CdSe QDs, curcumin and curcumin functionalized CdSe QDs, bare and modified electrodes were characterized using cyclic voltammetry technique. Finally the modified electrode was successfully applied in determination of ascorbic acid by cyclic voltammetery technique. Key Words: Cyclic Voltammetry, Quantum dots, Curcumin, Ascorbic acid 1. Introduction Biomolecules doped nanoparticles are applied in in-vitro and in-vivo bio-imaging and as therapeutic medicines [1, 2]. Synergetic effect is evolved in the combination of nanomaterials with biomolecules by enhancing the material behavior, drug loading capacity, high solubility and bioavailability [3]. However, toxicity associated with these nanoparticles pose serious side effects. Therefore, extensive research is required in designing of biocompatible nanoparticles. In general, chemical reductant such as sodium borohydrate, hydrazine, ammonia etc were used during the synthesis of nanoparticles [4]. Carcinogenicity associated in using these reducing agents makes them incompatible. Hence, green synthesis of nanomaterials and potential application of biomolecules functionalized nanomaterials has become recent trend in biosensing and biomedical research [5]. Several phytochemicals possess the property of functionalizing and reducing agents which aids in the development of biocompatible materials through ecofriendly synthesis. Curcumin, (1E,6E)-1,7-bis (4-hydroxy- 3-methoxyphenyl) -1,6- heptadiene-3,5-dione, is the principle compound of turmeric extract. In general, curcuminoids are grouped based on tautomeric forms of curcumin. Active groups of curcumin exists in two forms, two equivalent enol groups and 1,3-diketo groups of curcumin has been widely studied. As the enol form of curcumin is found to be energetically stable in both solid as well as in solution phase [ 6 ] and the 1, 3-diketo form complex with most of the trans metal ions making it as metal ion sensing reagents [7]. The electrocatalytic property of curcumin is found to be tremendous upon functionalizing with transition metals [8]. The nucleation growth during the green synthesis of gold and silver nanoparticles using curcumin as capping and reducing agent is considered extremely stable and biocompatible [9]. CdSe QDs, are a type of inorganic/ inorganic core-shell type nanoparticles also called as semiconductor nanocrystals, containing group II and VI elements [10]. CdSe nanoparticles within the size range of 2-10 nm exhibits quantum confinement. The electronic band gap of the CdSe QDs is said to be 1.73 eV [11]. CdSe QDs are promising material for optoelectronic device manufacturing but photodegradation of CdSe QDs affect the performance of these devices [12]. Hence, functionalizing QDs using organic ligands helps to enhance the stability of CdSe QDs and to reduce the photodegradation process [13]. Both alkyl [14] and aromatic [13] ligands were utilized for the synthesis of optically active and photostable CdSe QDs. Based on the optical property developed by CdSe QDs after functionalized with thioglycerol [15] they were used as an analytical tool for the quantitative estimation of cadmium ions using UV-Visible spectroscopy technique. Application of CdSe QDs in the development of electrochemical sensors was of great interest. To overcome the drawback associated with the optical and spectroscopic studies such as photobleaching, development of electrochemical sensors has emerged using CdSe QDs [16]. Several chemical and biosensors were developed using CdSe QDs. The semi-conducting materials are either formed as composite in graphene 308 IJRAR- International Journal of Research and Analytical Reviews Research Paper

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