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Devarayan, Kesavan,Park, Jiyoung,Kim, Hak-Yong,Kim, Byoung-Suhk Elsevier 2017 Carbohydrate Polymers Vol.163 No.-
<P><B>Abstract</B></P> <P>In this study, we present a highly efficient and economical solution called as ‘<I>in situ</I> hydrogenation’ for preparation of highly conductive thin film electrode based on silver nanodendrites. The silver nanodendrite (AgND)/cellulose acetate (CA) thin film electrodes exhibited sheet resistance ranging from 0.32ohm/sq to 122.1ohm/sq which could be controlled by changing the concentration of both silver and polymer. In addition, these electrodes exhibited outstanding toughness during the bending test. Further, these thin film electrodes have great potential for scale-up with an average weight of 3mg/cm<SUP>2</SUP> and can be also combined with active nanomaterials such as multiwalled carbon nanotubes (MWCNTs) to fabricate AgND/CA/MWCNTs thin film for high-performance flexible supercapacitor electrode. The AgND/CA/MWCNTs electrodes exhibited a maximum specific capacitance of 237F/g at a current density of 0.3A/g. After 1000 cycles, the AgND/MWCNT/CA exhibited a decrease of 16.0% of specific capacitance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile preparation of silver nanodendrite electrodes via ‘<I>in situ</I> hydrogenation’. </LI> <LI> Flexible electrode withstands 5000 bending cycle with low resistance of ∼1ohm/sq. </LI> <LI> A maximum specific capacitance of 237F/g at a current density of 0.3A/g. </LI> <LI> High cyclic stability with capacitance retention of 84% after 1000 cycle. </LI> </UL> </P>
Flexible transparent electrodes based on PANi nanowire for supercapacitors
( Kesavan Devarayan ),최웅기,서민강,김영근,김병석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Flexible and transparent electrodes based on in situ polymerization of PANi nanowires on nylon nanofiber-reinforced cellulose acetate thin film substrates were prepared in this study. The nylon nanofibers were electrospun followed by infiltration with cellulose acetate to get a highly transparent substrate. Then the PANi nanowires were grown uniformly on the transparent substrate by an in situ polymerization technique. The resulting thin films showed transparency maximum of 82% and sheet resistivity as low as 188 ohm/sq and a specific capacitance of 400 F/g.
( Kesavan Devarayan ),이은숙,뇌단운,서민강,김병석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Poly(vinyl alcohol)(PVA) is of particular interest, since it is highly soluble in water, biocompatible, easy to process, and optically transparent. However, in order to use in the area of biomedical application, the stability of PVA should be controlled in aqueous media, such as by crosslinking either chemically or physically. Electrospinning is a versatile technique for production of fibers having diameter ranging from sub-micro-to nano-meter with high surface area. In this study, we attempt to introduce new PVA/poly(acrylic acid) (PAA) composite hydrogel nanofibers incorporating polyhedral oligosilsesquioxane (POSS) prepared by electrospinning followed by simple thermal-treatment.
Lei, Danyun,Devarayan, Kesavan,Li, Xiang-Dan,Choi, Woong-Ki,Seo, Min-Kang,Kim, Byoung-Suhk 한국탄소학회 2014 Carbon Letters Vol.15 No.4
New precursors, poly(acrylonitrile-co-crotonic acid) (poly(AN-CA)) and poly(acrylonitrile-co-itaconic acid-co-crotonic acid) (poly(AN-IA-CA)) copolymers, for the preparation of carbon fibers, were explored in this study. The effects of comonomers with acidic groups, such as crotonic acid (CA) and/or itaconic acid (IA), on the stabilization of nanofibrous polyacrylonitrile (PAN) copolymers were studied. The extent of stabilization, evaluated by Fourier transform infrared spectroscopy, revealed that the CA comonomer could retard/control the stabilization rate of PAN, in contrast to the IA comonomer, which accelerated the stabilization process. Moreover, the synthesized PAN copolymers containing CA possessed higher Mv than those of the IA copolymers and also showed outstanding dimension stability of nanofibers during the stabilization, which may be a useful property for improving the dimensional stability of polymer composites during manufacturing.
뇌단운,( Kesavan Devarayan ),최웅기,서민강,김영근,김병석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
In this study, we prepared carbon fiber (CF)-polyaniline (PANi) nanocomposite via an in situ polymerization technique. In the beginning, carbon fiber mats, which were applied as substrates for supercapacitors, were obtained from new precursors, poly(acrylonitrile-co-crotonic acid) and poly(acrylonitrile-co-itaconic acid-co-crotonic acid). The carbonized fiber mats were used as substrates for in situ polymerization of polyaniline. The electrochemical studies revealed that the PANi/CFs exhibited a maximum specific capacitance of 113 F/g.
고태훈,( Kesavan Devarayan ),최웅기,서민강,김영근,김병석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A combination of suitable materials with high stability, conductivity, high surface area, and good capacitance is important to fabricate a high performance supercapacitor. In view of this, in this study, a hybrid nanocomposite of Ag/PANi/MWCNT-NH<sub>2</sub> was prepared. At first, a nylon nanofiber-reinforced cellulose acetate thin film was used as a substrate for layer-by-layer buildup of MWCNT-NH2/PEDOT:PSS up to 10 bi-layers. Then Ag/PANi composite was deposited on to the LBL thin film by means of in situ polymerization. The electrochemical studies revealed exhibited a maximum 289 F/g specific capacitance with better cyclic stabilities over 500 cycles.