Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 26, Issue 1, Pages 261-264Publisher
KOREAN INST CHEM ENGINEERS+
DOI: 10.1007/s11814-009-0044-7
Keywords
Nanometer-sized Bismuth Tungsten Oxide; Hydrothermal Treatment; pH; Conductivity
Funding
- National Center for Nanomaterials Technology
- Yeungnam University
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Nanometer-sized bismuth tungsten oxides, Bi(2)WO(6)s, were successfully synthesized by hydrothermal treatment at 200 degrees C for 24 hr, and their morphologies and crystallite sizes were influenced by adjusting the conditions to pH 4, 7, and 9. TEM images revealed that the particles were sheet-shaped and the crystallite sizes ranged from 7-120 nm. The samples absorbed in the visible range at about 3 80400 nm. The lowest conductivity, 1.0 x 10(6) ohm/square, was observed for Bi(2)WO(6)s prepared at pH 4 with a 150 nm film thickness. As the annealing temperature for Bi(2)WO(6)s prepared at pH 7 was increased, the conductivity decreased due of formation of larger particles by coagulation and sintering at high temperatures. Conductivity appears to improve with increasing film thickness up to 1,500 nm.
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