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Ragupathy, Dhanusuraman,Gopalan, Anantha Iyengar,Lee, Kwang-Pill The Korean Society of Analytical Sciences 2008 분석과학 Vol.21 No.1
Organic disulfide compounds are having higher theoretical capacity than the conventional cathode material and are considered as the important storage material. Here, we are reporting the preparation of poly (2,2'-dithiodianiline) PDDA/multiwall carbon nanotubes, (MWCNTs) composites under different experimental conditions. Amine functionalized and unfunctionalized MWCNTs were independently used for the preparation of composites. Composites were prepared in the presence of cetyl trimethyl bromide (CTAB), a cationic surfactant, and also in the absence of CTAB. A physical mixture of PDTDA and MWCNTs was formed with unfunctionalized MWCNTs. Grafting of PDDA onto MWCNTs was performed by chemical oxidative polymerization of 2, 2'-dithiodianiline in the presence of amine functionalized MWCNTs. The composites of MWCNTs and PDTDA were characterized for structure, morphology and thermal properties through Fourier transform infrared spectroscopy, Fourier transform Raman spectroscopy, scanning electron microscopy and UV-visible spectroscopy. The composite materials prepared by this method are expected to find applications as electrode materials for lithium batteries.
Dhanusuraman Ragupathy,Anantha Iyengar,이광필 한국분석과학회 2008 분석과학 Vol.21 No.1
Organic disulfide compounds are having higher theoretical capacity than the conventional cathodematerial and are considered as the important storage material. Here, we are reporting the preparation of poly(2,2'-dithiodianiline) PDDA/multiwall carbon nanotubes, (MWCNTs) composites under different experimentalof composites. Composites were prepared in the presence of cetyl trimethyl bromide (CTAB), a cationicsurfactant, and also in the absence of CTAB. A physical mixture of PDTDA and MWCNTs was formed withunfunctionalized MWCNTs. Grafting of PDDA onto MWCNTs was performed by chemical oxidative polymerizationof 2, 2-dithiodianiline in the presence of amine functionalized MWCNTs. The composites of MWCNTs andPDTDA were characterized for structure, morphology anspectroscopy, Fourier transform Raman spectroscopy, scanning electron microscopy and UV-visible spectroscopy.The composite materials prepared by this method are expected to find applications as electrode materials forlithium batteries.
Self-Assembly Growth of Electrically Conductive Chitosan Nanofibrous Scaffold
Dhanusuraman Ragupathy,김한도,Palanisamy Gomathi,Loganathan Kumaresan,이수출,Salem S. Al-Deyab,이상학 한국고분자학회 2012 Macromolecular Research Vol.20 No.10
We report on the synthesis of an electrically conductive chitosan nanofibrous scaffold (NFS) by a “simple template free self-assembly method’’ from biopolymer chitosan in the presence of inorganic acids as dopants and ammonium persulphate (APS) as an initiator. The morphology of the chitosan nanofibers scaffold (CS-NFS) was examined by field emission scanning electron microscopy (FE-SEM). Physiochemical characterizations of the CSNFS were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis. It is found that the morphology and structure of the CS-NFS strongly depend on the kinds of dopant used. Cyclic voltammogram measurement reveals that CS nanofibers have high electrocatalytic activity compared to chitosan powder. The CS nanofibers are expected to be useful in electrical, optical, and electrochemical devices.
Dhanusuraman Ragupathy,Palanisamy Gomathi,이수출,Salem S. Al-Deyab,이상학,김한도 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
A simple, rapid and efficient route to prepare polyaniline nanostructures (PANI-NS) by ‘‘one-step chemical oxidative polymerization’’ method is described. This method possesses advantages in terms of good yield, short reaction time, neat conditions and cost-effectiveness. The morphology of the PANI-NS was investigated by field-emission scanning electron microscopy (FE-SEM). The average diameter of single PANI-NS was calculated to be 376 nm. Results from UV–visible spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and cyclic voltammetry (CV) reveals the existence of PANI units present in the polymeric nanostructures. Also, electrical conducting property of the PANI-NS was analyzed using four-probe measurement method.
Dhanusuraman Ragupathy,박정제,이수출,김재창,김민관,이소민,김한도,Annamalai Rajendran,이상학,전경문 한국고분자학회 2011 Macromolecular Research Vol.19 No.8
A modified electrode was fabricated by grafting poly(2,5-dimethoxyaniline) (PDMA) onto multiwalled carbon nanotubes (MWNTs) and used for the electrocatalytic oxidation of ascorbic acid (AA). Cyclic voltammetry was used to fabricate the modified electrode and demonstrate the electroactivity of MWNT-g-PDMA-ME towards AA. Field emission scanning electron microscopy (FESEM) of MWNT-g-PDMA-ME revealed the combined presence of MWNT and PDMA. The MWNT-g-PDMA-ME exhibited excellent performance for AA at 320 mV with a high sensitivity (12.78 μA/mM) and linear concentration range of 1 to 5 mM (correlation coefficient of 0.9991). Differential pulse voltammetry (DPVs) showed that MWNT-g-PDMA-ME experiences negligible interference from other electro-active components.
Kim, Tae-Gyung,Ragupathy, Dhanusuraman,Gopalan, Anantha Iyengar,Lee, Kwang-Pill IOP Pub 2010 Nanotechnology Vol.21 No.13
<P>Electrospinning was employed to prepare new multi-functional nanowebs. Cyclodextrin based inclusion complex (CD-IC) was used to disperse multiwalled carbon nanotubes (MWNT) within electrospun polyvinylidene fluoride nanofibrous membranes (PVdF-NFM). Subsequently, MWNT(CD-IC)/PVdF-NFM was loaded with gold (Au) particles. The morphology, structure and thermal properties of Au/MWNT(CD-IC)/PVdF-NFM were investigated by transmission electron microscopy, field emission scanning electron microscopy, FT-IR spectroscopy, x-ray diffraction spectroscopy and differential scanning calorimetry. The new Au/MWNT(CD-IC)/PVdF-NFM is electroactive and shows excellent electrocatalytic activity towards oxidation of ascorbic acid. </P>
Palanisamy Gomathi,김한도,Dhanusuraman Ragupathy,김우년 한국고분자학회 2011 Macromolecular Research Vol.19 No.5
Conducting hybrid submicrostructures composed of chitosan (CS) and silica-based conducting poly[N-(3-trimethoxysilylpropyl)aniline] (PTMSPA) were prepared by graft copolymerization. The spherical and fibrous morphologies of the CS-PTMSPA hybrid submicrostructures could be observed by optical and field emission electron microscopy. Under room temperature conditions, the CS-PTMSPA graft copolymers possessed the uniformly distributed spherical submicroparticles with diameters in the range of ca. 400-1,000 nm. On the other hand, under ice cold conditions (5 ºC), CS-PTMSPA showed the development of randomly oriented fiber bundles. The diameter of a single fiber was in the range of ca. 100-500 nm. These CS-PTMSPA fibers were obtained by a temperaturedriven template-free self-assembly pathway. Spectroscopic and thermal evaluations confirmed that CS-PTMSPA graft copolymer had been prepared by an oxidative polymerization method. The electrochemical performance of the CS-PTMSPA submicrostructures were compared with CS and PTMSPA by cyclic voltammetry with the Fe(CN)6^3-/4-system as a redox marker. The CS-PTMSPA submicrostructures showed high electrical conductivity (difference between the anodic and cathodic peaks = 0.24 and 0.29 V for CS-PTMSPA sphere and fiber, respectively) compared to those of CS (0.14 V) and PTMSPA (0.20 V), which was ascribed to the relatively high surface-to-volume ratios of these submicrostructures.
조성빈,채호진,김태영,백점인,Dhanusuraman Ragupathy,이수출,김재창 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.12
Amine-functionalized silica sorbents have been widely investigated for post-combustion CO2 capture at low temperature. In previous studies, amine-functionalized silica sorbents were prepared using a synthetic hierarchically porous silica, which is not commercially available in large quantities, because porous silica support structures strongly influence CO2 capture performance. Here, we propose a feasible and facile fabrication method for amine-functionalized silica sorbents using 3-aminopropyltrimethoxy silane (APTS) and fumed silica (FS), where APTS serves as both an active material and a binder. The APTS-functionalized FS sorbents have large amounts of active amino groups and porous structures and demonstrate good multicycle stability with excellent CO2 capture performance. In addition, cetyltrimethylammonium bromide was found to improve the diffusion pathway of CO2, leading to enhanced CO2 capture capacity because of the suppression of excessive condensation during preparation. Therefore, the APTS-functionalized FS sorbents could be cost- and energy-efficiently prepared using a novel one-pot synthesis method; the resulting sorbents exhibit excellent CO2 capture performance.
Suba Lakshmi Madaswamy,Saikh Mohammad Wabaidur,Mohammad Rizwan Khan,이수출,Ragupathy Dhanusuraman 한국고분자학회 2021 Macromolecular Research Vol.29 No.6
In this work, a metal free polyaniline nanorod (PANI-NR) with graphitic carbon nitride (GCN) nanocomposite has been synthesized by solar irradiation approach an acidic medium without the assistance of any surfactant and template. As synthesized PANI-NR/GCN nanocomposite was characterized by morphology studies, which found that the average diameter of the PANI-NR was 500 to 600 nm and the length of the nanorod range from 3 to 3.5 μm where GCN randomly dispersed on the surface of PANI-NR. The elemental composition, structural and vibrational spectra of PANI-NR/GCN are observed through EDX, Mapping, XRD, and FT-IR studies. Subsequently, the synthesized PANI-NR/GCN nanocomposite was used as an electrocatalyst, which was characterized through cyclic voltammetry, impedance, and chronoamperometric studies. The fabricated PANI-NR/GCN modified electrode shows significant electrocatalytic activity, lower charge resistance, high stability, and longevity towards methanol oxidation reaction (MOR) in an alkaline medium.