title: One-pot synthesis of magnetite nanorods/graphene composites and its catalytic activity toward electrochemical detection of dopamine.
abstract: Magnetite (Fe3O4) nanorods anchored over reduced graphene oxide (rGO) were synthesized through a one-pot synthesis method, where the reduction of GO and in-situ generation of Fe3O4 nanorods occurred concurrently. The average head and tail diameter of Fe3O4 nanorods anchored over the rGO matrix are found to be 32 and 11 nm, respectively, and morphology, structure and diameter of bare Fe3O4 nanorods were not altered even after the composite formation with rGO. The increased structural disorders and decrement in the sp(2) domains stimulated the high electrical conductivity and extended catalytic active sites for the prepared rGO/Fe3O4 nanocomposite. The constructed rGO/Fe3O4/GCE sensor exhibited excellent electrocatalytic activity toward the electrooxidation of dopamine (DA) with a quick response time of 6s, a wide linear range between 0.01 and 100.55 µM, high sensitivity of 3.15 µA µM(-1) cm(-2) and a lower detection limit of 7 nM. Furthermore, the fabricated sensor exhibited a practical applicability in the quantification of DA in urine samples with an excellent recovery rate. The excellent electroanalytical performances and straight-forward, surfactant and template free preparation method construct the rGO/Fe3O4 composite as an extremely promising material for the diagnosis of DA related diseases in biomedical applications.
authors.affiliation: Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, India.
authors.forename: J
authors.initials: J
authors.lastname: Salamon
authors.affiliation: Department of Forest Science & Technology, Institute of Agriculture and Life Sciences, Chonbuk National University, Jeonju 561-756, Republic of Korea.
authors.forename: Y
authors.initials: Y
authors.lastname: Sathishkumar
authors.affiliation: Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, India.
authors.forename: K
authors.initials: K
authors.lastname: Ramachandran
authors.affiliation: Department of Forest Science & Technology, Institute of Agriculture and Life Sciences, Chonbuk National University, Jeonju 561-756, Republic of Korea.
authors.forename: Yang Soo
authors.initials: YS
authors.lastname: Lee
authors.affiliation: Department of Energy Storage/Conversion Engineering, R & D Education Center for Specialized Graduate School of Hydrogen and Fuel Cells Engineering, and Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: djyoo@jbnu.ac.kr.
authors.forename: Dong Jin
authors.initials: DJ
authors.lastname: Yoo
authors.affiliation: Department of Chemistry, Chonbuk National University, Jeonju 561-756, Republic of Korea.
authors.forename: Ae Rhan
authors.initials: AR
authors.lastname: Kim
authors.affiliation: Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, India. Electronic address: kumarg2006@gmail.com.
authors.forename: G
authors.initials: G
authors.lastname: Gnana Kumar
mesh_terms: D002384:Catalysis; D003217:Conductometry / Q000295:instrumentation*; D003460:Crystallization; D004298:Dopamine / Q000032:analysis* / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry; D010316:Particle Size
chemical_list: D058185:Magnetite Nanoparticles; D010087:Oxides; D006108:Graphite; D004298:Dopamine
keywords: Active sites; Electrooxidation; Magnetite nanorods; Restacking; Sensitivity