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- 저자 : Anantha Iyengar, Gopalan (검색결과 48 건)
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Gopalan, Anantha Iyengar,Lee, Kwang-Pill,Hong, Mung-Hwa,Santhosh, Padmanabhan,Manesh, Kalayil Manian,Kim, Sang-Ho American Scientific Publishers 2006 Journal of nanoscience and nanotechnology Vol.6 No.6
<P>Hollow spheres of poly(diphenylamine) (PDPA) was prepared by confining PDPA in the galleries of montmorillonite organo clay modified with organoammonium cations (MMT). At first instant, diphenylamine (DPA) was loaded into the galleries of MMT and subjected to subsequent oxidative polymerization to form PDPA. beta-naphthalene sulfonic acid (NSA) was used as medium to influence self-assembly of DPA inside the galleries of MMT. Polymerization of self assembled structure resulted hollow spheres of PDPA inside galleries of MMT. X-ray diffraction analysis (XRD), field emission transmission electron microscopy (FETEM), Fourier transform infra-red spectroscopy (FT-IR) and thermogravimetric analysis (TGA) were used to characterize the composites. Transmission emission microscopy of the composite shows the hollow spherical morphology of PDPA. FT-IR, UV-Visible spectroscopy, conductivity measurement and X-ray photoelectron spectroscopy were used to characterize the PDPA extracted from MMT galleries. PDPA extracted from MMT galleries was found to have difference in electronic property than PDPA formed by the conventional method, due to the confinement effect.</P>
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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.
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Nallal, Muthuchamy,Anantha Iyengar, Gopalan,Pill-Lee, Kwang American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.42
<P>A new titanium dioxide (TiO2)-based heterojunction nanohybrid (HJNH) composed of TiO2, graphene (G), poly[3-aminophenylboronic acid] (PAPBA), and gold nanoparticles (Au NPs) was synthesized and designated as TiO2(G) NW@PAPBA-Au HJNH. The TiO2(G) NW@ PAPBA-Au HJNH possesses dual-mode signal photoelectrochemical (PEC) and electrochemical transduction capabilities to sense glucose and glycated hemoglobin (HbAlc) independently. The synthesis of the HJNH material involved 1GAu 11) NIMP two sequential stages: (i) simple electrospinning synthesis of 1%-3111 APH 4. G-embedded TiO2 nanowires [TiO2(G) NWs] and (ii) onestep synthesis of Au NP-dispersed PAPBA nanocomposite (NC) in the presence of TiO2(G) NWs. The as-synthesized TiO2(G) NW@PAPBA-Au HJNH was characterized by field emission scanning electron microscopy, field emission transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared, thermogravimetric analysis, and UV-visible diffuse reflectance spectroscopy. A PEC platform was developed with TiO2(G) NW@PAPBA-Au HJNH for the selective detection of glucose without any enzyme auxiliary. The PEC glucose sensor presents an acceptable linear range (from 0.5 to 28 mM), good sensitivity (549.58 mu A mM(-1) cm(-2)), and low detection limit (0.11 mM), which are suited for diabetes glucose monitoring. Besides, the boronic acid groups in PAPBA were utilized as a host to capture HbAlc. We fabricated the electrochemical HbAlc sensor based on monitoring the electrocatalytic reduction current of hydrogen peroxide produced by HbAlc tethered to the sensor probe. The amperometric electrochemical sensor for HbAlc exhibited linear responses to HbAlc levels from 2.0 to 10% (with a detection limit of 0.17%). Notably, the performances of the fabricated glucose and HbAlc sensors are superior in the dual-signal transduction modes as compared to the literature, suggesting the significance of the newly designed bifunctional TiO2(G) NW@PAPBA-Au HJNH.</P>
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Lee, Kwang-Pill,Gopalan, Anantha Iyengar,Lee, See-Hee,Showkat, Ali Md,Nho, Young Chang Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of applied polymer science Vol.102 No.4
<P>Conducting polydiphenylamine was used to encapsulate silica nanoparticles through the oxidative polymerization of diphenylamine in the presence of ultrasonic irradiation. The polymerization was performed in the presence of sodium lauryl sulfate as a surfactant. Experiments performed in the absence of ultrasound clearly demonstrated that the application of ultrasonication played multiple roles in the preparation of a composite of polydiphenylamine with silica nanoparticles. Ultrasonication dispersed the silica nanoparticles, converted sodium lauryl sulfate to lauryl alcohol, and augmented the dispersion of the silica-nanoparticle/polydiphenylamine composite in an organic medium. Silica-nanoparticle/polydiphenylamine composites were also prepared in the absence of ultrasound and/or sodium lauryl sulfate. The silica-nanoparticle/polydiphenylamine composites were characterized with Fourier trans form infrared spectroscopy, ultraviolet–visible/near-infrared spectroscopy, and thermogravimetric analysis. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3912–3918, 2006</P>
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Lee, Kwang-Pill,Gopalan, Anantha Iyengar,Lee, Se Hee,Kim, Min Seok IOP Pub 2006 Nanotechnology Vol.17 No.2
<P>Aqueous dispersions of chiral polyaniline nanobundles (C-PANI-NB) were prepared by simple interfacial polymerization using immiscible organic/aqueous biphasic systems. C-PANI-NB arise from the intertwining of PANI chains over interconnected units of cyclodextrin sulfate. Formation of C-PANI-NB was witnessed only in the aqueous phase, irrespective of the organic solvent used in the interfacial polymerization. The PANI that formed in the aqueous phase existed in the C-PANI-NB form. This was evident from field emission transmission microscopy. The chiro-optical properties of C-PANI-NB are strikingly different from those of simple chiral polyaniline. C-PANI-NB exhibit size selective enantioseparation. C-PANI-NB are expected to find applications as modifiers in capillary electrophoresis, as catalysts for size selective asymmetric synthesis and in biological sensors. Also, the method adopted here for the preparation of C-PANI-NB could be extended to other conducting polymers. </P>
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Fabrication and properties of poly(vinylidenefluoride)/PbS/Au heterogeneous nanostructures.
Lee, Kwang-Pill,Gopalan, Anantha Iyengar,Park, Jong Wook,Ragupathy, Dhanusuraman,Manesh, Kalayil Manian American Scientific Publishers 2009 Journal of nanoscience and nanotechnology Vol.9 No.1
<P>We report on the fabrication of polyvinylidenefluoride (PVdF) PVdF/PbS and PVdF/PbS/Au heterogeneous nanostructures by the processes, electrospinning and chemical treatment. Initially electrospinning a solution consisting of PVdF and lead acetate was used to form PVdF nanofibers loaded with Pb ions. Exposure of Pb ions loaded PVdF fibers to H2S resulted in PVdF/PbS nanostructures. The deposition of gold nanoparticles onto PVdF/PbS nanostructures results in PVdF/PbS/Au heterogeneous structure. The existence of PbS particles with an average diameter of 11 nm is evident from field emission transmission electron microscopy (FETEM) image of PVdF/PbS. The results from X-ray diffraction of PVdF/PbS also predict the size of PbS particles as in accordance with FETEM. A blue shift in the optical transition of PbS is noticed in the UV-visible spectrum of PVdF/PbS as a result of quantum confinement effect. The band gap of PbS is influenced by the presence of Au nanoparticles over the PbS particles. An equal atomic weight % of Au and PbS is found in the PVdF/PbS/Au nanostructure as inferred from energy dispersive X-ray spectroscopy (EDX). Photoluminescence (PL) spectra of PVdF/PbS and PVdF/PbS/Au are compared. Emission peaks are noticed at 400 nm and 480 nm for PVdF/PbS and PVdF/PbS/Au nanostructures respectively for an excitation wavelength of 254 nm. The presence of Au nanoclusters in PVdF/PbS/Au diminishes the intensity of photo emission of PbS.</P>
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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.
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Anand, Gopalan Sai,Gopalan, Anantha Iyengar,Kang, Shin-Won,Lee, Kwang-Pill The Royal Society of Chemistry 2013 Journal of analytical atomic spectrometry Vol.28 No.4
<P>In this investigation, we established a new sensitive, selective and label free optical method for the detection of mercury ions (Hg<SUP>2+</SUP>) by utilizing cyano (–CN) ligand functionalized gold nanorods (GNRs) based on the surface plasmon resonance (SPR) of the GNRs. The functionalization of the GNRs was specifically done with a –CN group containing polymer, poly(2-aminobenzonitrile) (P2ABN), to preconcentrate the Hg<SUP>2+</SUP> ions on the surface of the GNRs prior to detection. The functionalization of the GNRs was carried out by two approaches. In the first approach, the GNR surface was modified with a porous silica network containing P2ABN (designated as GNR@silica-CN). In the second approach, GNR was modified with P2ABN (designated as GNR@P2ABN). The Hg<SUP>2+</SUP> ion detection strategy involves the preconcentration of Hg ions on the surface of GNR@silica-CN or GNR@P2ABN through the interaction of the –CN groups in P2ABN with Hg<SUP>2+</SUP> ions, reduction to Hg<SUP>0</SUP> atoms by ascorbic acid (AA), and monitoring the SPR of GNRs. The porous network in GNR@silica-CN allows efficient migration of Hg<SUP>0</SUP> to reach the GNR surface and causes effective amalgamation compared to GNR@P2ABN. As a result, GNR@silica-CN exhibits a significant change in the SPR of GNRs over a wide dynamic concentration range (from 50 nM to 5 μM) for Hg<SUP>2+</SUP> ions. The very low detection limit of 1 ppb with GNR@silica-CN for Hg<SUP>2+</SUP> ions suggests its excellent potential for the monitoring and detection of ultra low levels of Hg. In addition, the GNR@silica-CN shows no sensitivity for other environmentally relevant metal ions which confirms the high specificity for Hg<SUP>2+</SUP> ion detection in practical samples. We demonstrated the effectiveness of the present method by detecting Hg<SUP>2+</SUP> ions in spiked water (pond and water) samples. We envisage that this simple, fast and sensitive method will be suitable for environmental monitoring in the future.</P> <P>Graphic Abstract</P><P>A new highly selective sensing strategy for detection of mercury ions has been developed utilizing polymer containing cyano group functionalized gold nanorods. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ja30300d'> </P>
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