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- 저자 : Mahalingam, T. (검색결과 38 건)
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Fluorinated TiO2‑doped, glycine‑functionalized MWCNTs for high‑performance antibacterial agents
Umadevi Mahalingam1,Poornima P. Veerabaghu,Sangari Mayavan,Parimaladevi Ramasamy 한국탄소학회 2019 Carbon Letters Vol.29 No.1
Perennial need for bactericides requires cost-effective nanomaterials with strong antibacterial activities even in the absence of external irradiation. Hence, in this work, we have synthesized f-CFT (fluorinated TiO2-doped, glycine-functionalized MWCNTs) and have studied its antibacterial activities. Both gram-negative and gram-positive bacteria were analyzed in the absence of photo-activation. Zone of inhibition of 15 mm for S. aureus, and 11 mm for P. aeruginosa was observed for f-CFT owing to the synergistic bactericidal properties of functionalized MWCNTs, fluorine and nano-TiO2. Anatase phase TiO2 with average crystallite size as 35 nm was observed in XRD. Scanning electron microscopic images showed uniform mixed cubic structures. Hydroxyl groups observed in FT-IR along with the glycine MWCNTs interface aid the inhibition of bacterial growth even in the absence of photo activation. A desired higher gram-positive bacterial inhibition opens new gates for better antibacterial agents.
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Mahalingam, T,Kathalingam, A,Velumani, S,Lee, Soonil,Lew, Kyeung Seek,Deak Kim, Yong Institute of Physics 2005 Semiconductor science and technology Vol.20 No.8
<P>In this work the synthesis of zinc mercury selenide thin films (Zn<SUB>1−<I>x</I></SUB>Hg<I><SUB>x</SUB></I>Se) by electrodeposition is carried out. The films were deposited onto conducting glass (SnO<SUB>2</SUB>) substrates from an aqueous solution bath containing ZnSO<SUB>4</SUB>, HgCl<SUB>2</SUB> and SeO<SUB>2</SUB> at bath temperatures between 30 ?C and 70 ?C. The influence of deposition parameters such as electrolyte composition, deposition potential and temperature on the crystallinity and composition of the films is studied. It is found that the amount of mercury content in the solution bath and deposition potential control the composition and structure of the alloy films. The films were characterized by x-ray diffraction (XRD), energy dispersive x-ray analysis (EDAX), optical absorption and scanning electron microscope (SEM) studies. Photoelectrochemical solar cells studies using Zn<SUB>1−</SUB><I><SUB>x</SUB></I>Hg<I><SUB>x</SUB></I>Se thin films showed improved performance for annealed and etched electrodes and the results are discussed.</P>
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Mahalingam, T,Lee, Kyung Moon,Park, Kyung Ho,Lee, Soonil,Ahn, Yeonghwan,Park, Ji-Yong,Koh, Ken Ha IOP Pub 2007 Nanotechnology Vol.18 No.3
<P>The growth of ZnO nanorods on Au-coated ITO substrates using a low temperature wet chemical process is presented. Electron microscopy and x-ray diffraction observations reveal that the crystalline ZnO nanorods are preferentially oriented along the <I>c</I> axis. Room temperature photoluminescence (PL) measurements reveal a strong band edge emission at 382?nm, a signature of good crystallinity, with a weak and broad orange–red emission, which is typically attributed to the oxygen interstitials, in the range between 520 and 720?nm. Other than the second order feature of the band edge emission at 760?nm, no red or near-infrared bands are observed. The effect of precursor concentration on the morphological, structural and PL properties are studied, and the results are discussed. </P>
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Mahalingam, Shanmugam,Ayyaru, Sivasankaran,Ahn, Young-Ho The Royal Society of Chemistry 2018 Dalton transactions Vol.47 No.46
<P>A reduced graphene oxide-V2O5 nanocomposite was synthesized by a low temperature surfactant free hydrothermal method and its MFC performance was assessed. The structural properties of the synthesized nanocomposite were studied by X-ray diffraction. Field emission scanning electron microscopy of the nanocomposite revealed a wrinkled paper-like structure of rGO and a nanobelt-like structure of V2O5. This study estimated the viability of the graphene-based nanocomposite rGO-V2O5 as a novel cathode catalyst in single chamber air-cathode MFCs. A series of MFCs with different catalyst loadings were produced. The electrochemical behavior of the MFCs was calculated by cyclic voltammetry. The MFCs with the rGO-V2O5 nanocomposite cathode exhibited superior maximum power densities (83%) to those with the pure V2O5 cathodes. The rGO-V2O5 with a double-loaded nanocomposite catalyst achieved an enhanced power density of 1668 ± 11 mW m<SUP>−2</SUP> and an OCP of 698 ± 4 mV, which was 83% of that estimated for the Pt/C 2004 ± 15 mW m<SUP>−2</SUP> nanocomposite cathode. The significant increase in power density suggests that the reduced graphene oxide-V2O5 nanocomposite is a promising material for MFC applications. The CV result showed good agreement with the MFC result. The prepared rGO-V2O5 nanocomposite cathode, particularly with a double loading catalyst, is promising as a sustainable low-cost green material for stable power generation and long-term operation of MFCs.</P>
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Electrosynthesis and studies on Cadmium-Indium-Selenide thin films
Mahalingam, T.,Thanikaikarasan, S.,Chandramohan, R.,Chung, K.,Chu, J.P.,S.Velumani,Rhee, J.K. Elsevier 2010 Materials Science and Engineering B Vol. No.
Thin films of Cadmium Indium Selenide (CdIn<SUB>2</SUB>Se<SUB>4</SUB>) have been deposited on indium doped tin oxide coated conducting glass (ITO) substrates using potentiostatic cathodic electrodeposition technique. Cyclic voltammetry has been carried out in order to fix the deposition potential in the range between -1500 and +600mV versus SCE. X-ray diffraction pattern shows that the deposited films exhibit tetragonal structure with most prominent reflection along (200) plane. The dependency of microstructural parameters such as crystallite size, strain and dislocation density with deposition potential has been studied. Surface morphology and film composition have been analyzed using scanning electron microscopy and energy dispersive analysis by X-rays, respectively. EDX analysis reveals that films with well defined stoichiometry has been obtained at a deposition potential -950mV versus SCE. The optical band gap, refractive index and extinction coefficient are evaluated from optical absorption measurements. The experimental observations are discussed in detail.
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Mahalingam, Shanmugam,Ramasamy, Jayavel,Ahn, Young-Ho Springer-Verlag 2018 Journal of cluster science Vol.29 No.2
<P>To enhance the degradation of colour and chemical oxygen demand using photocatalytic activity, Graphene-CuO-Co3O4 hybrid nanocomposites were synthesized using an in situ surfactant free facile hydrothermal method. The photocatalytic degradation of synthetic anionic dyes, methyl orange (MO) and Congo red (CR), and industrial textile wastewater dyes under visible light irradiation was evaluated. The synthesized nanocomposite was characterized structurally and morphologically using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, high-resolution transmission electron microscope, and Fourier transform infrared spectroscopy. Evaluation of the colour indicated complete removal at 15 min of irradiation for the MO and CR dyes, with 99% degradation efficiency. The reaction time for the primary effluent wastewater dye was 60 min for 81% dye removal. In contrast, a longer reaction time was required to meet the national discharge regulation for the raw wastewater dye, 300 min for 60% dye removal. The mechanism for dye degradation using the Graphene-CuO-Co3O4 hybrid nanocomposite was elucidated using the Langmuir-Hinshelwood model, and the rate constant and half-life of the degradation process were calculated. The results demonstrate that photocatalytic degradation using a hybrid nanocomposite and visible light irradiation is a sustainable alternative technology for removing colour from wastewater dye.</P>
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Mahalingam, Shanmugam,Ahn, Young-Ho The Royal Society of Chemistry 2018 New journal of chemistry Vol.42 No.6
<P>A reduced graphene oxide–Fe3O4–NiO hybrid nanocomposite was synthesized using a surfactant free <I>in situ</I> hydrothermal method. The resulting hybrid nanocomposite contained a uniform distribution of nickel oxide nanoparticles and cubic structured Fe3O4. The photocatalytic degradation of color and COD elimination was examined experimentally using a visible light irradiation source. The synthesized hybrid nanocomposite was characterized using a range of techniques such as XRD, FE-SEM with EDX and EPMA, HR-TEM with SAED pattern, XPS spectra and Raman spectra analysis. The mechanism and kinetics of dye degradation by the rGO–Fe3O4–NiO hybrid nanocomposite were examined. The results confirmed that the 2 wt% G–Fe3O4–NiO hybrid nanocomposite degraded 99% of both methyl red and crystal violet dyes rapidly within 15 min; 97% of effluent dye was degraded within 60 min and 87% of the influent dye was degraded within 300 min under visible light sources. Therefore, the synthesized hybrid nanocomposite is an effective catalyst with potential applications in industrial wastewater treatment to remove hazardous pollutants.</P>
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Mahalingam, Shanmugam,Ramasamy, Jayavel,Ahn, Young-Ho Elsevier 2017 JOURNAL- TAIWAN INSTITUTE OF CHEMICAL ENGINEERS Vol.80 No.-
<P><B>Abstract</B></P> <P>Graphene-alpha-molybdenum trioxide (α-MoO<SUB>3</SUB>) nanocomposites were synthesized using a facile hydrothermal method. The synthesized material was characterized by various physico-chemical techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), ultra-violet–visible diffuse reflectance spectroscopy (DRS) and Raman spectroscopy. Raman spectroscopy revealed a D to G band intensity ratio of approximately one, which confirmed the good graphitization of the synthesized graphene and graphene-MoO<SUB>3</SUB> nanocomposite. The I<SUB>D</SUB>/I<SUB>G</SUB> ratio of the G-αMoO<SUB>3</SUB> nanocomposite was calculated to be 1.2. HRTEM revealed graphene sheets decorated with MoO<SUB>3</SUB> nanoparticles. The size of the MoO<SUB>3</SUB> nanoparticles dispersed over the wrinkled graphene sheets layers was 10 ± 5 nm. The chemical state functionality and composition (carbon, oxygen and molybdenum) of the G-αMoO<SUB>3</SUB> nanocomposite was examined by XPS. TGA was performed to examine the thermal stability and decomposition of the nanomaterials and nanocomposite. The photocatalytic performance of the bare synthesized MoO<SUB>3</SUB> nanoparticles and graphene-αMoO<SUB>3</SUB> nanocomposite was analyzed by the degradation of MB dye under ultra-violet and visible light irradiation. The G-αMoO<SUB>3</SUB> nanocomposite showed an extraordinarily higher photocatalytic activity than the bare MoO<SUB>3</SUB> nanoparticles. Up to 97% and 96% of the MB dye was removed under UV and visible light irradiation, respectively. A comparison of the photocatalytic effect of the bare MoO<SUB>3</SUB> and G-MoO<SUB>3</SUB> nanocomposite showed that the bare MoO<SUB>3</SUB> induced less photocatalytic degradation than the G-MoO<SUB>3</SUB> nanocomposite. The photocatalytic result suggested that graphene plays an important role in enhancing the photocatalytic activity. These results show that the G-αMoO<SUB>3</SUB> nanocomposite is an efficient catalyst for the degradation of MB dye and has potential in industrial wastewater treatment. The mechanism of the degradation process was examined by calculating the rate constant and half-life of the degradation process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of G-αMoO<SUB>3</SUB> nanocomposites by a surfactant free hydrothermal method. </LI> <LI> The G-αMoO<SUB>3</SUB> nanocomposite possess improved visible light photocatalytic activity. </LI> <LI> The highest degradation efficiency of 97% and 96% was achieved for the G-αMoO<SUB>3</SUB> catalyst. </LI> <LI> G-αMoO<SUB>3</SUB> can be used as an efficient catalyst for industrial waste water treatment. </LI> </UL> </P> <P><B>Graphic abstract</B></P> <P>[DISPLAY OMISSION]</P>
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