ﺳﺎﺧﺖ و ﺷﻨﺎﺳﺎﯾﯽ ﺧﻮاص ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﮐﺎﻫﺶﯾﺎﻓﺘﻪ/ ﻣﮕﻨﺘﯿﺖ

Reduced Graphene Oxide/Magnetite Nanocomposites: Synthesis and Characterization

در اﯾﻦ ﻣﻘﺎﻟﻪ اﺑﺘﺪا ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﺑﺎ اﺳﺘﻔﺎده از روش ﻫﺎﻣﺮ ﺳﺎﺧﺘﻪ ﺷﺪ ﺳﭙﺲ ﯾﮏ روش ﮐﺎرآﻣﺪ ﺑﺮاي ﺳﺎﺧﺖ ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﮐﺎﻫﺶﯾﺎﻓﺘﻪ/ ﻣﮕﻨﺘﯿﺖ اراﺋﻪ ﺷﺪه اﺳﺖ. ﺑﺎ اﺳﺘﻔﺎده از آﻧﺎﻟﯿﺰﻫﺎي FT-IR ،XRD ،VSM و SEM ﺧﻮاص و وﯾﮋﮔﯽﻫﺎي ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﮐﺎﻫﺶﯾﺎﻓﺘﻪ/ ﻣﮕﻨﺘﯿﺖ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. ﺗﺼﺎوﯾﺮ SEM ﻧﺸﺎن داد ﮐﻪ ﻧﺎﻧﻮ ذرات ﻣﮕﻨﺘﯿﺖ ﺑﻪ ﺧﻮﺑﯽ ﺑﺮ روي ﺻﻔﺤﺎت ﮔﺮاﻓﻦ ﻗﺮار ﮔﺮﻓﺘﻪاﻧﺪ. ﺑﺎ اﺳﺘﻔﺎده از ﺗﺼﺎوﯾﺮ SEM ﻣﯿﺎﻧﮕﯿﻦ ﺳﺎﯾﺰ ﻧﺎﻧﻮ ذرات ﻣﮕﻨﺘﯿﺖ ﺑﺮ روي ﺻﻔﺤﺎت ﮔﺮاﻓﻨﯽ ﺑﺮاﺑﺮ ﺑﺎ ﻣﻘﺪار 5±22 ﻧﺎﻧﻮﻣﺘﺮ ﻣﺤﺎﺳﺒﻪ ﺷﺪ. ﻧﺘﺎﯾﺞ VSM ﻧﺸﺎن داد ﮐﻪ ﺑﺎوﺟﻮد ﮔﺮاﻓﻦ، ﻧﺎﻧﻮ ذرات ﻣﮕﻨﺘﯿﺖ در ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﮐﺎﻫﺶﯾﺎﻓﺘﻪ/ ﻣﮕﻨﺘﯿﺖ ﺗﺄﺛﯿﺮ زﯾﺎدي روي ﺧﻮاص ﻣﻐﻨﺎﻃﯿﺴﯽ ﻧﺎﻧﻮ ذرات ﻣﮕﻨﺘﯿﺖ اﯾﺠﺎد ﻧﮑﺮده اﺳﺖ؛ ﮐﻪ ﻧﺸﺎن دﻫﻨﺪه ﻣﺰﯾﺖ اﯾﻦ ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﺟﻬﺖ اﺳﺘﻔﺎدهﻫﺎي ﻣﻐﻨﺎﻃﯿﺴﯽ اﺳﺖ. ﺑﺮاي ﺑﺮرﺳﯽ ﺳﻨﯿﺘﯿﮏ اﻧﺘﻘﺎل اﻟﮑﺘﺮون در ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﺳﺎﺧﺘﻪ ﺷﺪه آﻧﺎﻟﯿﺰ وﻟﺘﺎﻣﺘﺮي ﭼﺮﺧﻪاي ﺑﻪ ﻋﻤﻞ آﻣﺪ. ﺑﺮرﺳﯽﻫﺎي وﻟﺘﺎﻣﺘﺮي ﭼﺮﺧﻪاي ﻧﯿﺰ ﻧﺸﺎن داد ﮐﻪ ﺑﺎ ﺗﺜﺒﯿﺖ ﻧﺎﻧﻮ ذرات ﻣﮕﻨﺘﯿﺖ ﺑﺮ رو ﺑﺴﺘﺮ ﮔﺮاﻓﻨﯽ ﻣﯿﺰان ﺟﺮﯾﺎن اﮐﺴﺎﯾﺶ-ﮐﺎﻫﺶ ﻧﺴﺒﺖ ﺑﻪ ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﮐﺎﻫﺶﯾﺎﻓﺘﻪ ﺑﻪ ﻣﯿﺰان ﻗﺎﺑﻞ ﺗﻮﺟﻬﯽ اﻓﺰاﯾﺶ ﭘﯿﺪا ﮐﺮده اﺳﺖ ﮐﻪ ﻣﯽﺗﻮاﻧﺪ در وﯾﮋﮔﯽ ﺣﺴﮕﺮي ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﮔﺮاﻓﻦ اﮐﺴﯿﺪ ﮐﺎﻫﺶﯾﺎﻓﺘﻪ/ ﻣﮕﻨﺘﯿﺖ ﮐﺎرآﻣﺪ ﺑﺎﺷﺪ.

In this paper, graphene oxide was synthesized using the Hummer’s method. Then, an efficient method for the synthesis of Reduced Graphene Oxide/Magnetite (RGO/Fe3O4) nanocomposite is presented. The properties of RGO/Fe3O4 nanocomposite were investigated using FT-IR, XRD, VSM and SEM. The SEM images show that magnetite nanoparticles were appropriately placed on graphene sheet. Distribution of Fe3O4 nanoparticles on the graphene sheets was properly established. The average size of 22 ± 5 nm for Fe3O4 nanoparticles, which have been put on graphene substrates, was measured using SEM images. The VSM results demonstrate that there is no apparent change in the properties of magnetite nanoparticles in RGO/Fe3O4 nanocomposite. Therefore, this nanocomposite could be appropriate for magnetic applications. A cyclic voltammetric analysis was performed to investigate the electron transfer kinetics in nanocomposite. Distribution of Fe3O4 NPs on the graphene layers increased the efficiency and sensitivity of the electrochemical sensor, causing the RGO/Fe3O4 nanocomposite to have considerably higher electrochemical catalytic properties. A modified GCE was also fabricated based on RGO/Fe3O4 nanocomposite to investigate the electrocatalytic oxidation of K3[Fe(CN)6] using cyclic voltammetry detection. In cyclic voltammetry studies, oxidation current enhancement was observed when magnetite nanoparticles loaded on graphene substrates, which could make RGO/Fe3O4 nanocomposite as an efficient electrochemical sensor.