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RISS 인기검색어
- 검색키워드
- 저자 : Dhanasekaran R. (검색결과 4 건)
- 무료
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Dhanasekaran, V.,Soundaram, N.,Kim, Seong-Il,Chandramohan, R.,Mantha, Srinivas,Saravanakumar, S.,Mahalingam, T. The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.6
<P>We have reported on the synthesis of CuO nanostructures <I>via</I> a simple sol–gel approach with high yield at low cost by the reduction of aqueous solutions of Cu(NO<SUB>3</SUB>)<SUB>2</SUB> and Na<SUB>2</SUB>NO<SUB>3</SUB>. Synthesized nanostructures were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), fluorescence spectroscopy, Raman scattering and UV-Vis-NIR spectroscopy. Structural studies revealed that the prepared CuO nanostructures were polycrystalline in nature with monoclinic structure. The crystallite size of CuO nanostructures was estimated to be ∼10 nm using Debye–Scherrer's formula. The uniform and nanoregime grains were observed in SEM micrographs. The optical band gap value was estimated to be 1.2 eV using Tauc's plot. The Raman scattering investigations revealed A<SUB>g</SUB> and B<SUB>g</SUB> mode peaks at 278 cm<SUP>−1</SUP>, 332 cm<SUP>−1</SUP> and 618 cm<SUP>−1</SUP>, respectively.</P> <P>Graphic Abstract</P><P>A<SUB>g</SUB> and B<SUB>g</SUB> mode vibration peaks are observed in the Raman spectrum with a lower optical band gap of 1.2 eV. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00084f'> </P>
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M. Periyasamy,R. Dhanasekaran 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
We evaluated certain issues related to magnetic resonance imaging (MRI) coupled with the use of active 2.5 GHz radio frequency identification (RFID) tags for patient identification using low field (0.3 T) MRI and computed tomography (CT) scans. We also investigated the performance of the RFID reader located outside the MRI room by considering several factors. A total of ten active RFID tags were exposed to several MRI sequences and X-rays of CT scan. We found that only card type active RFID tags are suitable for patient identification purpose in MRI environment and both wristbands as well as card tags were suitable for the same in CT environment. Severe artifacts were found in the captured MRI and CT images when the area of the imaging was in proximity to the tags. No external factors affected the performance of active RFID reader stationed outside the MRI scan room.
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Kalidasan M.,Baskar K.,Dhanasekaran R. 한국물리학회 2016 Current Applied Physics Vol.16 No.9
Pure, Nd doped and Nd:Yb co-doped barium chloride dihydrate (BaCl2$2H2O) single crystals were grown and analyzed with various characterization techniques. The measured unit cell parameters show that the grown crystals belong to monoclinic system. Powder X-ray diffraction spectra indicates that the dopants enhance (2 1 0) orientation of BaCl2$2H2O crystal. X-ray rocking curves have been recorded to analyze the crystallinity of the grown single crystals. Optical absorption spectra of the grown crystals contain strong absorption bands in infrared region. Spectral overlap of absorption bands of Yb3þ and Nd3þ ion around 850 nme1060 nm in Nd:Yb co-doped single crystal indicates the prospect of energy transfer between them. A significant enhancement has been observed in the photoluminescence spectrum of Nd:Yb codoped single crystal recorded with 244 nm laser excitation. Photon upconversion ability of the crystals was tested using Nd:YAG laser of wavelength 1064 nm. An unusual upconverted green emission from pure centrosymmetric BaCl2$2H2O single crystal has been observed. The energy of upconverted green light of Nd:Yb co-doped barium chloride dihydrate single crystal is higher which may be due to energy transfer occurred between Yb3þ and Nd3þ ions. FTIR and FT-Raman spectral analyses were carried out to study the vibrational modes of pure, Nd doped and Nd:Yb co-doped BaCl2$2H2O single crystals.
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S. Sugan,K. Baskar,R. Dhanasekaran 한국물리학회 2014 Current Applied Physics Vol.14 No.11
CuInS2, CuInSe2 and CuInTe2 nanocubes of chalcopyrite structure have been successfully synthesized by hydrothermal process using deionized water as solvent at 180 C for 20 h. The crystallinity, compositional, morphological and optical properties of the synthesized samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), Raman and photoluminescence (PL) spectra analyses. The Raman spectra of the synthesized CuInS2, CuInSe2 and CuInTe2 samples show the dominant A1 modes at 293, 172 and 121 cm1 respectively. The possible chemical reaction and mechanism of nanocubes formation were discussed. The emission wavelength of as synthesized CuInS2, CuInSe2 and CuInTe2 samples were blue shifted at 746 nm (1.66 eV), 863 nm (1.43 eV) and 859 nm (1.44 eV) respectively.
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