Electronic, electrical and magnetic behaviours of reduced graphene-oxide functionalized with silica coated gold nanoparticles

被引：29

作者：

Idisi, David O. ^{[1
]}

Ali, Haydar ^{[2
]}

Oke, J. A. ^{[1
]}

Sarma, Sweety ^{[1
]}

Moloi, S. J. ^{[1
]}

Ray, Sekhar C. ^{[1
]}

Wang, H. T. ^{[3
]}

Jana, Nikhil R. ^{[2
]}

Pong, W. F. ^{[4
]}

Strydom, Andre M. ^{[5
]}

机构：

[1] Univ South Africa, CSET, Dept Phys, Private Bag X6,1710 Sci Campus, Johannesburg, South Africa

[2] IACS, Ctr Adv Mat, Kolkata 700032, India

[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[4] Tamkang Univ, Dept Phys, Taipei 251, Taiwan

[5] Univ Johannesburg, Highly Correlated Matter Res Grp, Phys Dept, POB 524, ZA-2006 Auckland Pk, South Africa

来源：

APPLIED SURFACE SCIENCE | 2019年 / 483卷

基金：

新加坡国家研究基金会;

关键词：

R-GO; R-GO:Au-NPs; XANES; XPS; M-H; I-V; CARBON NANOTUBES; FILMS; COMPOSITE; SENSORS;

D O I：

10.1016/j.apsusc.2019.03.271

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have synthesized graphene-oxide (GO) by the modified hummer's process and subsequently reduced it with gold-nanoparticles (Au-NPs) using silica coated colloidal Au-NPs and hydrazine monohydrate solutions to form r-GO: Au-NPs nanocomposites. We have studied the microstructure, electronic, electrical and magnetic properties of r-GO and r-GO: Au-NPs nanocomposites. We have observed from the Raman spectroscopy that the intensity of D-peak (disorder) gets reduced with respect to G (graphite-cluster) in r-GO: Au-NPs composites. The reduction of I-D/I-G ratio obtained from Raman spectra [r-GO: 1.22 -> r-GO:(Au-NPs) 4.88: 0.98] clearly indicates that the sp(2) cluster is reduced in r-GO: Au-NPs nanocomposites. The reduction of sp(2)-cluster and/or enhancement of sp(3) cluster is due to replacement of sp(2)-cluster by the Au-NPs. This observation also observed from the X-ray absorption near edge structure (XANES) spectroscopy, X-ray photoelectron spectroscopy (XPS) measurements that are consistence with reduction of conductivity as we observe from the current (I)-voltage (V) characteristics of the nanocomposites. Magnetic M-H hysteresis loops show the magnetization is enhanced in r-GO: Au-NPs nanocomposites. We believe that the reduction of conductivity and enhancement of magnetization of r-GO: Au nanocomposites would be most suitable for ferro-electro-magnetic materials for the memory storage device applications.

引用

页码：106 / 113

页数：8

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