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Sambasivam, S.,Jeong, Jung Hyun,Choi, Byung Chun,Lim, Kwon Taek,Kim, Sang Su,Song, Tae Kwon Cambridge University Press (Materials Research Soc 2011 Journal of materials research Vol.26 No.5
<▼1><B>Abstract</B><P/></▼1><▼2><P>Nanoparticles of Cd1-<I>x</I>Cu<I>x</I>S (<I>x</I> = 0-0.15) were synthesized by chemical coprecipitation using thiophenol as a capping agent. The x-ray diffraction patterns reveal that the pure and doped CdS nanoparticles are single phase with cubic zinc blende structure. The transmission electron microscopy shows the average size of the nanoparticles is about 8.5 nm. Optical absorption spectra indicate the energy gap decreases with increasing Cu<SUP>2+</SUP> concentration. The broad emission peak around 520 nm is completely quenched with increasing Cu<SUP>2+</SUP> content. The electron spin resonance analysis also confirms the Cu (II) ion to be doped substitutionally in CdS nanoparticles and the Lande factor of all the samples with sharp resonance is g = 2.0.</P></▼2>
Sambasivam, S.,Kim, S.B.,Jeong, J.H.,Choi, B.C.,Lim, K.T.,Kim, S.S.,Song, T.K. Elsevier 2010 CURRENT APPLIED PHYSICS Vol.10 No.6
Pure and Er<SUP>3+</SUP> doped SnO<SUB>2</SUB> semiconductor nanoparticles have been synthesized by solgel technique. The X-ray diffraction patterns show peaks corresponding to tetragonal structure of SnO<SUB>2</SUB>. No Er related impurity peaks could be observed. From the TEM micrographs average crystallite size was estimated to be 12 nm. The UV-visible absorption spectra of SnO<SUB>2</SUB>:Er showed blue shift in the absorption shoulder compared with the spectra of undoped SnO<SUB>2</SUB> sample. Photoluminescence emission intensity of SnO<SUB>2</SUB>:Er nanoparticles was found to be quenched with increasing concentration of Er<SUP>3+</SUP> ions. The electron spin resonance (ESR) analysis of Er doped SnO<SUB>2</SUB> nanoparticles indicated Er in 3 + state with g = 2.
Rosaiah Pitcheri,Divya Ponnusamy,Sambasivam Sangaraju,Tighezza Ammar M.,Kalaivani V.,Muthukrishnaraj A.,Ayyar Manikandan,Niyitanga Theophile,Kim Haekyoung 한국탄소학회 2024 Carbon Letters Vol.34 No.1
Synthesis of extremely competent materials is of great interest in addressing the energy storage concerns. Manganese oxide nanowires (MnO2 NWs) are prepared in situ with multiwall carbon nanotubes (MWCNT) and graphene oxide (GO) using a simple and effective hydrothermal method. Powder XRD, Raman and XPS analysis are utilized to examine the structural characteristics and chemical state of composites. The initial specific discharge capacity of pure MnO2 NWs, MnO2 NWs/MWCNT and MnO2 NWs/rGO composites are 1225, 1589 and 1685 mAh/g, respectively. The MnO2 NWs/MWCNT and MnO2 NWs/rGO composites showed stable behavior with a specific capacity of 957 and 1108 mAh/g, respectively, after 60 cycles. Moreover, MnO2 NWs/rGO composite sustained a specific capacity of 784 mAh/g, even after 250 cycles at a current density of 1 A/g showing outstanding cycling stability.
Structural, Morphological, and Optical Studies on Li-doped ZnO Thin Films Deposited by Using PLD
Guojie Li,S. Sambasivam,Saes Byul Kim,박성욱,정중현,전병억,최병춘 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4
We report the structural and the optical properties of Zn_(1−x)Li_xO (x = 0.0, 0.02, 0.08, 0.12, 0.18) nanocrystalline thin films deposited on ?Al_2O_3 substrates by using pulsed laser deposition. X-ray diffraction (XRD) analysis revealed that all the films were single phase and had a hexagonal wurtzite structure. The lattice constant increased gradually with increasing Li content. Atomic force microscopy (AFM) showed that the grain size of the films was approximately 20 ?30 nm. Optical absorption studies in the wavelength range 200 ?900 nm revealed an increase in the band gap of the Li-doped ZnO films from 3.19 to 3.41 eV. Photoluminescence (PL) spectroscopy of these films was carried out. The luminescence observed was attributed to defects in the nanocrystalline Li-doped ZnO films, and the PL intensity decreased with increasing Li content.
D. Paul Joseph,C. Venkateswaran,S. Sambasivam,최병춘 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.3
Pure CuO and CuO:Fe (10%) thin films were spray deposited on glass, silicon and quartz substrates at 500 ℃. XRD patterns confirmed a monoclinic structure with cubic CuFe<sub>2</sub>O<sub>4</sub> impurities. Surface morphology smoothed out on doping with Fe. The direct and the indirect band gaps of pure CuO and CuO:Fe (10%) films estimated from the spectral transmittance data indicated blue and red shifts respectively. X-ray photoelectron spectroscopy revealed the charge states of the elements. The activation energy for conduction was reduced on doping with Fe as estimated from an Arrhenius plot of the temperature-dependent resistivity. The magnetization of the CuO:Fe (10%) films at 300 K showed a hysteresis behavior with large coercivity. The large variation in the coercivity of the films due to pinned- type magnetic behavior may be useful for multilayer switching device applications.
Kovendhan, M.,Paul Joseph, D.,Manimuthu, P.,Sendilkumar, A.,Karthick, S.N.,Sambasivam, S.,Vijayarangamuthu, K.,Kim, H.J.,Choi, B.C.,Asokan, K.,Venkateswaran, C.,Mohan, R. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.5
Lithium (Li) (0-5 wt%) doped V<SUB>2</SUB>O<SUB>5</SUB> thin films were spray deposited at 450 <SUP>o</SUP>C onto ITO substrates. Structural analysis using X-ray diffraction and Raman spectroscopy revealed orthorhombic phase of the films. In addition to the V<SUB>2</SUB>O<SUB>5</SUB> phase, presence of VO<SUB>2</SUB> peaks due to high deposition temperature is also evident from structural and optical characterization. The non-stoichiometric nature of the films due to loss of the terminal O atom was confirmed from Raman spectroscopy. The direct band gap, indirect bandgap, and phonon energies were also calculated from optical studies. Different charge states of vanadium ions present in the film were identified from X-ray photoelectron spectroscopy study. Results from cyclic voltammetry experiments reflected significant differences between the undoped and Li doped V<SUB>2</SUB>O<SUB>5</SUB> samples. Transport properties by Hall-effect measured at room temperature indicated significant increase in conductivity, carrier concentration and mobility of V<SUB>2</SUB>O<SUB>5</SUB> thin films on doping with Li. A Dye Sensitized Solar Cell (DSSC) was fabricated using mobility enhanced 5 wt% Li doped V<SUB>2</SUB>O<SUB>5</SUB> film as photoanode and its efficiency was found to be 2.7%. A simple electrochromic cell is fabricated using undoped V<SUB>2</SUB>O<SUB>5</SUB> thin film to demonstrate the colour change.
Mohan Reddy Pallavolu,Kurugundla Gopi Krishna,Goli Nagaraju,P.S. Srinivasa Babu,Sangaraju Sambasivam,ADEM SREEDHAR 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Development of structurally stable transition metal-oxides and cost-effective biomass-based carbon materials have attracted considerable attention in the fabrication of hybrid supercapacitors. In this work, we designed spinal copper-doped cobalt oxide (Cu-Co3O4 ) nanoboxes decorated functionalized-carbon nanotubes (f-CNTs) as hybrid redox-type material and agriculture crop-waste derived mesoporous activated carbon as capacitive-type electrode for high-performance hybrid supercapacitors. Structural properties reveal that the Cu-Co3O4 has a cubic spinel structure and Raman spectra results confirm the presence of f-CNTs. The hybrid composite material demonstrates superior redox behavior with excellent structural durability. The hybrid electrodes exhibit maximum specific capacity of 130.7 mAh g−1 at 0.5 A g−1 with 86.7 % capacitance retention over 10,000 cycles. Besides, the crop waste-derived activated carbon demonstrates high surface area (1549 m2g-1), mesoporous characteristics and excellent capacitive behavior. The high voltage hybrid supercapacitor is further fabricated with Cu-Co3O4 @F-CNTs as battery-type and biomass-derived activated carbon as capacitive-type electrodes, which demonstrate high energy density of 30.8 Wh kg−1 at 5972 W kg -1 power density. The augmented results indicate that the hybrid composites with biomass-derived carbon materials pave the way for design of eco-friendly energy storage applications.