Browsing by Author "Sreedhar, G."

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    A role of lithiated sarcosine TFSI on the formation of single crystalline SrTiO3 nanocubes via hydrothermal method
    (Elsevier, 2014) Sreedhar, G.; Sivanantham, A.; Baskaran, T.; Rajapandian, R.; Vengatesan, S.; Berchmans, L.J.; Gosipatala, S.G.
    Effective capping activity of lithiated sarcosine TFSI on the formation of single crystalline SrTiO3 nanocubes via hydrothermal method has been investigated. Lithiated sarcosine TFSI formation by zwitterionic transformation was confirmed by NMR and FTIR studies. 13C and 7Li NMR studies showed the stabilization of metal hydroxide anions by the secondary ammonium cations (-NH2+-) of lithiated sarcosine. The FESEM results revealed the formation of SrTiO3 nanocubes. TEM images showed the spherical and square shaped defects within the round edged cubic particles with the average size of 90 nm and SAED pattern indicates the single crystalinity. The crystalinity and nanocubic shape of SrTiO3 were strongly influenced by lithiated sarcosine TFSI. Hence, we propose lithiated sarcosine TFSI as an effective capping agent for the synthesis of single crystalline SrTiO3 nanocubes. © 2014 Elsevier B.V.
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    Enhanced photoelectrochemical water splitting behaviour of tuned band gap CdSe QDs sensitized LaB6
    (American Scientific Publishers, 2017) Babu, M.S.; Sivanantham, A.; Chakravarthi, B.B.; Kannan, R.S.; Panda, S.K.; Berchmans, L.J.; Arya, S.B.; Sreedhar, G.
    We report the fabrication of tuned band gap quantum dots sensitized LaB6 hybrid nanostructures and their application as a photoanode for photoelectrochemical water splitting. The lanthanum hexaboride (LaB6) obtained by molten salt electrolysis method is sensitized with different sized CdSe quantum dots, which form a multiple-level hierarchical heterostructure and such design enhance the light absorption and charge carrier separation, which in turn showed higher photocurrent density compared to that of pristine LaB6. When LaB6 is sensitized with CdSe quantum dots of different band gaps, which have the absorption in the green and red (530 and 605 nm) regions in visible light, developed a ten times higher photocurrent density (11.0 mA cm-2) compared to that of pristine LaB6 (0.5 mA cm-2 at 0.75 V vs. Ag/AgCl) in 1 M Na2S electrolyte under illumination. These results prove that the tuned band gap quantum dots sensitized LaB6 heterostructures are an ideal candidate for a photoanode in solar water splitting applications. © © 2017 American Scientific Publishers All rights reserved.
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    Hot corrosion stability of double perovskite and pyrochlore in suphate solution of vanadates or chlorides at 900 °C
    (Trans Tech Publications Ltd ttp@transtec.ch, 2015) Baskaran, T.; Sreedhar, G.; Arya, S.B.
    Double perovskites, pyrochlores are having matching thermal expansion co-efficient with bond coat and may act as candidate materials for an intermediate layer between bond coat and top coat in Thermal Barrier Coatings. Hot corrosion stability of double perovskites and pyrochlores is also important for enhanced thermal cycle life. Based on these issues, systematic studies were conducted to find the hot corrosion stability of double perovskites and pyrochlores. The results revealed that, double perovskites and pyrochlores were undergone destabilization in the Na2SO4+50 wt.% V2O5 and Na2SO4+10 wt.% NaCl environments at 900 °C. The implications of these findings addresses the key issues related hot corrosion mechanisms and give a pathway to developing newer materials. This study clearly indicates the destabilization of both double perovskites and pyrochlores in vanadium and chloride environments at 900 °C. © (2015) Trans Tech Publications, Switzerland.
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    Hot corrosion stability of double perovskite and pyrochlore in suphate solution of vanadates or chlorides at 900 �C
    (2015) Baskaran, T.; Sreedhar, G.; Arya, S.B.
    Double perovskites, pyrochlores are having matching thermal expansion co-efficient with bond coat and may act as candidate materials for an intermediate layer between bond coat and top coat in Thermal Barrier Coatings. Hot corrosion stability of double perovskites and pyrochlores is also important for enhanced thermal cycle life. Based on these issues, systematic studies were conducted to find the hot corrosion stability of double perovskites and pyrochlores. The results revealed that, double perovskites and pyrochlores were undergone destabilization in the Na2SO4+50 wt.% V2O5 and Na2SO4+10 wt.% NaCl environments at 900 �C. The implications of these findings addresses the key issues related hot corrosion mechanisms and give a pathway to developing newer materials. This study clearly indicates the destabilization of both double perovskites and pyrochlores in vanadium and chloride environments at 900 �C. � (2015) Trans Tech Publications, Switzerland.