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- 검색키워드
- 저자 : Santhosh A.N. (검색결과 3 건)
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A. Santhosh Kumar,N. M. Huang,H. S. Nagaraja 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.4
Herein, the nanostructured Sn containing ZnO is directly synthesized on the surface of substrate by modified sol gel approach under low-temperature condition. The samples are characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), Raman-scattering, photoluminescence (PL) and photoelectrochemical analyses. The SEM micrographs show that the undoped and 1 at. % Sn doped films are composed of nanorods and the concentration of 2 at. % Sn doping hinders the rod-like structure’s growth and modulates into granular nature. The investigations of XRD reveal that the synthesized undoped and Sn doped ZnO nanorods possess a perfect hexagonal growth habit of wurtzite zinc oxide, along the (002) direction of preference. The Raman spectra demonstrate that the vibrational mode of E1(LO), which is very weak in undoped and 1at. % Sn doped ZnO, is strongly enhanced with 2 at. % Sn doping into ZnO lattice. PL spectra show that strong UV emission in pure and 1 at. % Sn doped ZnO, while there is dominant green emission in 2 at. % Sn doped ZnO. Moreover, all the samples are photo electrochemically active and exhibit the highest photocurrent of 28 μA for the 1 at. % Sn doped ZnO nanorod arrays in 0.2M Na2SO4 electrolyte, on light irradiation. Time dependent photoresponse tests are carried out by measuring the photocurrent under chopped light irradiation.
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Wagh Aditya A.,Bhat Shwetha G.,Anusree V.K.,Santhosh P.N.,Elizabeth Suja,Kumar P.S. Anil 한국물리학회 2023 Current Applied Physics Vol.49 No.-
The rare-earth chromates, RECrO3 and manganites REMnO3 (RE = Eu, Y, Dy, Ho, Gd) are considered potential room temperature multiferroics. However, artefacts and undesirable signals pose a severe challenge in confirming the ferroelectric (FE) phase, especially in pyroelectric current measurement technique. We propose a simple modified approach to the technique, named as 4-segment thermal cycling protocol. This protocol assists in isolating the irreversible thermally stimulated current from those associated with spontaneous and reversible nature of the electric polarization in FE phase. Here, we have compared simulated response of two hypothetical materials; an FE material and a paraelectric material. Further, we experimentally verify the protocol in a single crystal of prototype FE material, Glycine Phosphite. Using the proposed protocol, we investigated polycrystalline materials, HoCrO3 (reported multiferroic earlier) and DyFe0.5Mn0.5O3. Our results expound on the absence of reversible spontaneous electric polarization in temperature ranges tested.
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Sathish K.V.,Sridhar K.N.,Seenappa L.,Manjunatha H.C.,Vidya Y.S.,Chinnappa Reddy B.,Manjunatha S.,Santhosh A.N.,Munirathnam R.,Raj Alfred Cecil,Damodara Gupta P.S.,Sankarshan B.M. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
For the first time Aluminium-BariumeZinc oxide nanocomposite (ZABONC) was synthesized by solution combustion method where calcination was carried out at low temperatures (6000 C) to study the electromagnetic (EM) (X/g) radiation shielding properties. Further for characterization purpose standard techniques like PXRD, SEM, UV-VISIBLE, FTIR were used to find phase purity, functional groups, surface morphology, and to do structural analysis and energy band gap determination. The PXRD pattern shows (hkl) planes corresponding to spinel cubic phase of ZnAl2O4, cubic BaðNO3Þ2, a and g phase of Al2O3 which clearly confirms the formation of complex nano composite. From SEM histogram mean size of nano particles was calculated and is in the order of 17 nm. Wood and Tauc’s relation direct energy band gap calculation gives energy gap of 2.9 eV. In addition, EM (X/g) shielding properties were measured and compared with the theoretical ones using standard procedures (NaI (Tl) detector and multi channel analyzer MCA). For energy above 356 keV the measured shielding parameters agree well with the theory, while below this value slight deviation is observed, due to the influence of atomic/crystallite size of the ZABONC. Hence synthesized ZABONC can be used as a shielding material in EM (X/g) radiation shielding
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