S K Gupta
Articles written in Journal of Chemical Sciences
Volume 88 Issue 3 June 1979 pp 191-196 Organic
It has been shown that the KNH2/NH3 cyclisation of ortho/meta halogenated Schiff bases, or the corresponding dihydro compounds, succeeds when 1,2-naphthynes and 2,3-pyridynes are involved as intermediates. Using this procedure 3-aza-benzo[j]phenanthridine, 9-azaphenanthridine and 2,11-diazachrysene have been synthesized.
Volume 96 Issue 1-2 January 1986 pp 9-12 Inorganic and Analytical
Phosphate and arsenate apatites of barium and one of their solid solutions were prepared by a wet method and characterized by chemical, x-ray, infrared and thermogravimetric analyses. Chemical analysis gave the stoichiometry of the samples while x-ray and infrared studies confirmed the formation of a solid solution. The range of thermal stabilities of the samples was established through thermogravimetric analysis.
Volume 122 Issue 1 January 2010 pp 57-62
Different ZnO nanostructures such as nanowires, nanobelts and tetrapods have been grown and used for preparation of thick film (with random grain boundaries) as well as isolated nanowire/nanobelt gas sensors. Sensitivity of different type of sensors has been studied to H2S and NO gases. The results show that the response of ZnO sensors to H2S arises from grain boundary only whereas both grain boundaries and intragrain resistances contribute towards response to NO. In addition, oxygen vacancies in the lattice were also seen to help in improvement of sensor response. Room temperature operating H2S and NO sensors based on ZnO nanowires have been demonstrated. Further, sensors based on isolated nanobelts were found to be highly selective in their response to NO.
Volume 134, 2022
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