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Chemical bath deposition synthesis and electrochemical properties of MnO2 thin film: Effect of deposition time and bath temperature

Aref A A, Tang Y W

Materials Science Poland

2014

Vol. 32, No. 4

555--564

Manganese dioxide (MnO2) films with different nanostructures were deposited on indium tin oxide (ITO) glasses by using chemical bath deposition (CBD). Deposition temperature and time were varied from 60 °C to 90 °C and from 2 h to 72 h, respectively. The samples have been characterized using an X-ray diffraction (XRD), field emission scanning electron microscope (SEM) and an electrochemical workstation. The films deposited at 60 °C for 8 h showed that obtained nanoflowers had an amorphous nature, while those deposited at higher temperatures of 70, 80 and 90 °C showed a well-developed nanowire and nanorod morphology. However, those which were deposited at 60 °C, showed the best electrochemical properties, including a higher specific capacitance, good rate of performance and a cycling stability (93 % loss of the initial value after 10,000 cycles).

Influence of Coagulation Bath Temperature on the Porous Structure and Strength Properties of PAN Fibres Including Montmorillonite

Boguń M., Mikołajczyk T.

Fibres & Textiles in Eastern Europe

2006

Vol. 14, no. 3 (57)

19--22

An analysis was carried out concerning the influence of coagulation bath temperature on the porous structure and the sorption & strength properties of polyacrylonitrile (PAN) fibres which include montmorillonite (MMT). We stated that fibres formed at a temperature of 25 °C were characterised by maximum tenacity at the level of 19 cN/tex. Obtaining fibres with increased total pore volume up to 0.34 cm3/g, which is beneficial for the medical purposes of the carbon fibres obtained from the PAN fibres discussed, requires the solidification process to be conducted in a coagulation bath at a temperature of 35 °C.

Przeprowadzono analizę wpływu temperatury kąpieli zestalającej na strukturę porowatą, właściwości sorpcyjne i wytrzymałościowe włókien PAN z montmorylonitem. Stwierdzono, że najwyższą wytrzymałość właściwą na poziomie 19 cN/tex charakteryzują się włókna formowane w temperaturze 25 °C. Uzyskanie całkowitej objętości por podwyższonej do 0,34 cm3/g korzystnej ze względu na medyczne przeznaczenie włókien węglowych otrzymywanych w dalszych procesach z badanych włókien PAN wymaga prowadzenia procesu zestalania w kąpieli o temperaturze 35 °C.