Comparison of Sizes, Morphologies and Optical Properties of NiO Nanostructures Synthesized Using Acetate and Nitrate Anions from Nickel Salts via Hydrothermal Method
Pranwadee Kaewmuang, Watcharapong Pudkon, Anurak Prasatkhetragarn, Piyarat Nimmanpipug, Sila Kittiwachana, Sulawan Kaowphong** Author for corresponding; e-mail address: sulawank@gmail.com
Volume: Vol.45 No.2 (March 2018)
Research Article
DOI:
Received: 12 October 2016, Revised: -, Accepted: 29 December 2016, Published: -
Citation: Kaewmuang P., Pudkon W., Prasatkhetragarn A., Nimmanpipug P., Kittiwachana S. and Kaowphong S., Comparison of Sizes, Morphologies and Optical Properties of NiO Nanostructures Synthesized Using Acetate and Nitrate Anions from Nickel Salts via Hydrothermal Method, Chiang Mai Journal of Science, 2018; 45(2): 1122-1128.
Abstract
Porous NiO nanocrystals were synthesized using a hydrothermal method in mediums of different anions from nickel salts, acetate (CH3COO-) and nitrate (NO3-),followed by calcination at 500 °C. Firstly, b-Ni(OH)2 powders with a hexagonal structure were formed. Using acetate and nitrate anions, the obtained b-Ni(OH)2 powders were composed of thin nanosheets (0.8-2.1 mm in length), and a splinter-like structure self-assembled with longer nanosheets (9.8-24.2 mm), respectively. The difference in the interaction ability between the anions and the b-Ni(OH)2 surfaces, affecting the growth behavior of the crystals, was examined using the density functional theory (DFT) method. After calcination, the b-Ni(OH)2 turned into porous NiO with a cubic structure but their morphologies were unchanged. The porous NiO with longer nanosheets possessing higher crystallinity and larger surface area provided better UV-Vis absorption ability.