Biophysical and electrochemical properties of Self-assembled noncovalent SWNT/DNA hybrid and electroactive nanostructure |
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| Institution: | 1. Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran;2. Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran;1. Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran;2. Laboratory of Bio-Inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, Università di Trento, via Mesiano, 77, I-38123 Trento, Italy;3. Ket Lab, Edoardo Amaldi Foundation, Italian Space Agency via del Politecnico snc, I-00133 Roma, Italy;4. School of Engineering & Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;1. Department of Physics, University of the Free State, South Africa;2. Nanoscience and Nanotechnology LAboratory, Firat University, Elaz?g, Turkey;3. Department of Chemistry, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;4. Research Center for Advanced Materials Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;5. Unit of Science and Technology, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;6. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;7. Department of Physics, Faculty of Sciences and Arts, Bingol University, Bingol, Turkey;8. Department of Physics, Faculty of Sciences, Firat University, 23169 Elazig, Turkey;1. Photonics department, Research Institute for Applied Physics & Astronomy(RIAPA), University of Tabriz, Tabriz, Iran;2. Aras International Campus - University of Tabriz, Tabriz, Iran;3. School of Electrical, Electronic and Computer Engineering, The University of Western Australia, Crawley, WA 6009, Australia;1. Laboratory of Laboratory of Spectroscopic and Optical Characterization of Materials, Faculty of Sciences, University of Sfax, BP1171, 3018 Sfax, Tunisia;2. Institut des Molécules et Matériaux du Mans(IMMM), LUNAM Université, Université du Maine, CNRS UMR 6283, Avenue Olivier Messiaen, F-72085 Le Mans Cedex 09, France |
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| Abstract: | DNA self-assembled hybrid nanostructures are widely used in recent research in nanobiotechnology. Combination of DNA with carbon based nanoparticles such as single-walled carbon nanotube (SWNT), multi-walled carbon nanotube (MWNT) and carbon quantum dot were applied in important biological applications. Many examples of biosensors, nanowires and nanoelectronic devices, nanomachine and drug delivery systems are fabricated by these hybrid nanostructures. In this study, a new hybrid nanostructure has been fabricated by noncovalent interactions between single or double stranded DNA and SWNT nanoparticles and biophysical properties of these structures were studied comparatively. Biophysical properties of hybrid nanostructures studied by circular dichroism, UV–vis and fluorescence spectroscopy techniques. Also, electrochemical properties studied by cyclic voltammetry, linear sweep voltammetry, square wave voltammetry, choronoamperometry and impedance spectroscopy (EIS). Results revealed that the biophysical and electrochemical properties of SWNT/DNA hybrid nanostructures were different compare to ss-DNA, ds-DNA and SWNT singly. Circular dichroism results showed that ss-DNA wrapped around the nanotubes through π-π stacking interactions. The results indicated that after adding SWNT to ss-DNA and ds-DNA intensity of CD and UV–vis spectrum peaks were decreased. Electrochemical experiments indicated that the modification of single-walled carbon nanotubes by ss-DNA improves the electron transfer rate of hybrid nanostructures. It was demonstrated SWNT/DNA hybrid nanostructures should be a good electroactive nanostructure that can be used for electrochemical detection or sensing. |
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| Keywords: | SWNT/DNA hybrid nanostructures Spectroscopic study Circular dichroism Electrochemical study |
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