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Functionalization of graphene nanoplatelets using sugar azide for graphene/epoxy nanocomposites
Saswata Bose,Lawrence T. Drzal 한국탄소학회 2015 Carbon Letters Vol.16 No.2
We report a covalent functionalization of graphene nanoparticles (GnPs) employing 2,3,4-Tri-O-acetyl-β-D-xylopyranosyl azide followed by fabrication of an epoxy/functionalized graphene nanocomposite and an evaluation of its thermo-mechanical performance. Successful functionalization of GnP was confirmed via thermal and spectroscopic study. Raman spectroscopy indicated that the functionalization was on the edge of the graphene sheets; the basal plane was not perturbed as a result of the functionalization. The epoxy/functionalized GnP composite system exhibited an increase in flexural modulus (~18%) and glass transition temperature (~10°C) compared to an un-functionalized GnP based epoxy composite.
Kuila, T.,Bose, S.,Hong, C.E.,Uddin, M.E.,Khanra, P.,Kim, N.H.,Lee, J.H. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.3
The surface modification of graphene as well as the characterization of modified graphene-based polymer composite prepared by solution mixing techniques was examined. X-ray photoelectron spectroscopy was employed to examine the surface modification and formation of graphene. The tensile strength of the composite increased with 3 wt.% of DA-G loading and was 46% higher than that of neat LLDPE. The onset thermal degradation temperature of the composite (3 wt.% of DA-G) was increased by ∼40<SUP>o</SUP>C compared to neat LLDPE. A sharp increase in electrical conductivity of the composite was observed at 3 wt.% of DA-G content.
A green approach for the reduction of graphene oxide by wild carrot root
Kuila, T.,Bose, S.,Khanra, P.,Mishra, A.K.,Kim, N.H.,Lee, J.H. Pergamon Press ; Elsevier Science Ltd 2012 Carbon Vol.50 No.3
A green approach for the reduction of graphene oxide (GO) using wild carrot root is reported in this work. It avoids the use of toxic and environmentally harmful reducing agents commonly used in the chemical reduction of GO to obtain graphene. The endophytic microorganisms present in the carrot root, reduces exfoliated GO to graphene at room temperature in an aqueous medium. Transmission electron microscopy and atomic force microscopy images provide clear evidence for the formation of few layer graphene. Characterization of the resulting carrot reduced GO by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy shows partial reduction of GO to graphene. Raman spectroscopy data also indicates the partial removal of oxygen-containing functional groups from the surface of GO and formation of graphene with defects.
Vilian, A. T. Ezhil,Dinesh, Bose,Rethinasabapathy, Muruganantham,Hwang, Seung-Kyu,Jin, Chang-Soo,Huh, Yun Suk,Han, Young-Kyu The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.29
<P>Reduced graphene oxide (RGO) incorporated onto metal-organic framework (MOF)-derived Co3O4 hexagons is prepared <I>via</I> a hydrothermal route for supercapacitor and glucose sensor applications. Various analysis techniques demonstrate that the Co3O4 hexagons were uniformly spread over the thin graphene sheets to assist the electron accessibility of the electrode materials. Under optimized conditions, using 0.1 M KOH electrolyte at a current density of 4 A g<SUP>−1</SUP>, a specific capacitance value of 1300 F g<SUP>−1</SUP> is obtained. The fabricated asymmetric supercapacitor cycled reversibly and exhibits high energy and power density values of 65.8 W h kg<SUP>−1</SUP> and 2048 W kg<SUP>−1</SUP>, respectively, over the voltage range of −0.1 V to 0.4 V. The asymmetric supercapacitor shows 80.5% capacitance retention even after 5000 cycles at a current density of 4 A g<SUP>−1</SUP>, which indicates its high cycling stability in view of the fact that it is binder-free. Furthermore, the RGO-Co3O4 hexagon-modified electrode was optimized to realize the reliable amperometric determination of glucose concentration with a very low detection limit and excellent sensitivity value of 0.4 μM and 1.315 mA mM<SUP>−1</SUP> cm<SUP>−2</SUP>, respectively. All of these remarkable performance indicators suggest that RGO-Co3O4 is a promising electrode material for next-generation energy storage devices and electrochemical sensors.</P>
Wireless distributed computing: a survey of research challenges
Datla, Dinesh,Chen, X.,Tsou, T.,Raghunandan, S.,Hasan, S. M. S.,Reed, J. H.,Dietrich, C. B.,Bose, T.,Fette, B.,Kim, J. IEEE 2012 IEEE communications magazine Vol.50 No.1
<P>Recent advancements in radio technology provide great flexibility and enhanced capabilities in executing wireless services. One of these capabilities that can provide significant advantages over traditional approaches is the concept of collaborative computing in wireless networks. With collaborative radio nodes, multiple independent radio nodes operate together to form a wireless distributed computing (WDC) network with significantly increased performance, operating efficiency, and abilities over a single node. WDC exploits wireless connectivity to share processing- intensive tasks among multiple devices. The goals are to reduce per-node and network resource requirements, and enable complex applications not otherwise possible, e.g., image processing in a network of small form factor radio nodes. As discussed in this article, WDC research aims to quantify the benefits of distributed processing over local processing, extend traditional distributed computing (DC) approaches to allow operation in dynamic radio environments, and meet design and implementation challenges unique to WDC with the help of recently available enabling technologies, such as software radios and cognitive radios.</P>