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Sivalingam Ramesh,K. Karuppasamy,Dhanasekaran Vikraman,김은현,Lama Sanjeeb,이영준,김현석,김주형,김흥수 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
Nano-sized cobalt oxide decorated nitrogen-doped graphene oxide (Co3O4@NGO) composite was producedby a feasible and cost-effective hydrothermal route for electrochemical supercapacitors and gassensor applications. The composite materials formation was ascertained by Raman spectroscopy, X-raydiffraction, and X-ray photo electron spectroscopy analyses. Field emission scanning electron microscopy(FE-SEM) and field emission transmission electron microscopy (FE-TEM) results explored the controllednanoscale-sized sheet-like morphology for the prepared composite materials. Electrochemical storageproperties were studied by cyclic voltammetry (CV), galvanostatic charge–discharge process (GCD),and electrochemical impedance spectroscopy analyses using three-electrode configuration with 3 MKOH electrolyte. The observed results showed ~466 F/g specific capacitance at a current density of 1A/g for Co3O4@NGO composite structure with the capacity retention of 96 % after 5000 cycles. Further,the synthesized Co3O4@NGO composite revealed improved detection response, cyclability, and linearityfor dimethyl methyl phosphonate vapor gas sensing. The synthesized composite also demonstratedexcellent selectivity, stability, sensitivity, and rapid response time.
Interaction of VOCs with pyrene tetratopic ligands layered on ZnO nanorods under visible light
Sivalingam, Y.,Elumalai, P.,Yuvaraj, S.V.J.,Magna, G.,Sowmya, V.J.,Paolesse, R.,Chi, K.W.,Kawazoe, Y.,Di Natale, C. Elsevier Sequoia 2016 Journal of photochemistry and photobiology Chemist Vol.324 No.-
<P>In this work, the relationship between photosensitivity and chemical sensitivity of zinc oxide (ZnO) nanorods coated with pyrene based tetratopic ligands (PTL) is investigated under visible light. The electrical resistance of ZnO-PTL is affected by adsorption of different volatile organic compounds (VOCs) such as ethanol, n-hexane, trimethylamine, and triethylamine. The illumination strongly affects the response to the VOCs. To elucidate the interaction mechanism between PTL and VOCs, the experimental studies have been complemented by first principles calculations. Both experimental and computational results have shown that the amines are bound to PTL with higher affinity followed by ethanol (alcohol) and n-hexane (alkane). Our results have proved that the COOH functional group at the peripheral site of PTL is not only used for anchoring the molecule onto the ZnO, but it is also the main adsorption site for the VOCs, in particular for amines. In practice, the photo-optical properties of pyrene molecules are complemented by the high affinity of COOH group for amines in order to achieve a photo-activated sensor. The complementary use of optical dyes and chemical ligands can provide an innovative methodology for chemical sensors design. (C) 2016 Elsevier B.V. All rights reserved.</P>
Sivalingam Ramesh,김흥수,이영준,홍광욱,정동수,김주형 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.9
Cellulose is an excellent natural biopolymer that can be modified to organic-inorganic hybrid nanocomposites by connecting nanomaterials to hydroxyl structure to improve the thermal, morphological, optical and biological properties. Based on the unique properties of oxide materials, we selected SiO2 and ZrO2, which has a large bandgap and a high dielectric constant. To modify the cellulose structure, we used an in-situ sol-gel process to form a cellulose-L-tyrosine (CE-L-tyr) and further synthesized hybrid cellulose-L-tyrosine-SiO2/ZrO2 nanocomposite materials by γ-aminopropyl triethoxysilane (γ-APTES) as coupling agent in the presence of tetraethoxysilane (TEOS) and zirconium isopropoxide. The cellulose-L-tyrosine-SiO2/ZrO2 hybrid nanocomposites were characterized by FTIR, XPS, XRD, UV, TGA, DSC, SEM, EDX and TEM measurements. The different analysis results show the optical transparency, thermal stability, and control morphology of hybrid nanocomposites. From antimicrobial test, CE-L-tyr-SiO2/ZrO2 hybrid nanocomposites exhibit stronger activity against Bacillus cereus and E. coli than that Lactobacillus and Pseudomonas aeruginosa.
Drinking Water Quality Control in Malaysia.
Sivalingam, P. M. 동아대학교 환경문제연구소 1988 硏究報告 Vol.11 No.2
It is evident that although the criteria employed to control and distribute treated portable water supply in Malaysia is based on WHO standards, there is still much room to improve the current implemented technology. Endeavours should also be made to make available to all residents of rural areas in Malaysia treated protable water supply in order to prevent and curb outbreaks of water borne diseases.
Metal-organic and porous organic framework in electrocatalytic water splitting
Sivalingam Gopi,Murugavel Kathiresan,Kyusik Yun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
The use of hydrogen as a clean and sustainable energy carrier is a desirable alternative to the use of fossilfuels. It is strongly anticipated that the development of superior electrocatalysts for boosting these processeswill reduce their overpotentials and increase the accessibility of their practical applications. Metalorganicframeworks (MOFs) and Porous organic polymers (POPs) are gaining popularity as nonpreciousalternatives to drive global water splitting due to their adaptable compositions, exceptional porosities,and ultrahigh surface areas. The use of metal–organic frameworks (MOFs) for electrochemical watersplitting has advanced rapidly in recent years. This article highlights the most significant findings fromrecent studies on designing advanced MOFs for enhancing electrochemical water splitting. Electrocatalysts based on metal–organic frameworks (MOFs) and Porous organic polymers (POPs) getspecial consideration with regard to their structure–property relationships, production methods, anddesign principles. We anticipate that this study will be a valuable tool for advancing the developmentof MOF and POP-based electrocatalysts towards usable water splitting and will also offer insights intopotential future energy technologies beyond water electrolysis.
Ramesh, Sivalingam,Kim, Heung Soo,Haldorai, Yuvaraj,Han, Young-Kyu,Kim, Joo-Hyung Elsevier 2017 Materials letters Vol.196 No.-
<P><B>Abstract</B></P> <P>Nanostructured manganese dioxide decorated multi-walled carbon nanotube (MnO<SUB>2</SUB>/MWNT) composite was prepared by a hydrothermal method using a 3D precursor manganese benzoate dihydrazinate. Microscopic analysis confirmed that the nanostructured MnO<SUB>2</SUB> particles were densely decorated over the MWNT surface. The composite showed high specific capacitance (276F·g<SUP>−1</SUP> at a current density of 3.0A·g<SUP>−1</SUP>) and an excellent cycle stability (91.6% capacitance retention after 5000 cycles), suggesting its potential application for a high-performance supercapacitor.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile synthesis of nanostructured MnO<SUB>2</SUB>/MWNT composite. </LI> <LI> 3D coordination complex as a precursor. </LI> <LI> Composite showed higher capacitance of 276F·g<SUP>−1</SUP>. </LI> <LI> Excellent cyclic stability and reversibility. </LI> </UL> </P>