The acidimetric titration of sulfamic acid with electrogenerated hydroxide ions was studied. The accuracy of the method was determined by examining the dependencies on the storage time of sulfamic acid solution, amount of sulfamic acid, etc.; the precision and accuracy obtained were O.0lo/~. The coulometric titration of sulfamic acid was compared with that of potassium hydrogenphthalate. To determine the effect of carbon dioxide, examining the dependence on sample amount is recommended.
Highly transparent ZnO thin films were prepared by calcining ZnO 2 precursor films deposited from aqueous solutions. The transparency of the resultant ZnO thin films, which was directly associated with that of the precursor films, depended on the kind of zinc source, the composition of the starting solution, and the deposition temperature of the ZnO 2 precursor. The most highly transparent ZnO thin film was obtained by calcining a ZnO 2 precursor film which was deposited from a solution containing 0.01 moldm 3 of ZnSO 4 , 1.8 moldm 3 of H 2 O 2 , and 2.1 moldm 3 of NH 3 at 303 K. Doping of a ZnO thin film with indium was attempted by an immersion of the thin film in an In NO 3 3 solution and a subsequent heat-treatment at 773 K in a N 2 atmosphere, which resulted in an electrical conductivity of 535 Sm.
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