期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 14, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-012-0781-0
关键词
Silver molybdate; Broom-like; Flower-like; Hydrothermal method; Microrods; Synthesis method
资金
- National Science Foundation [CMMI-0653986]
- U.S. Department of the ARMY [W911NF-08-1-0460]
- Air Force
- CONICYT CHILE (FONDECYT REGULAR) [1120644]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [959568] Funding Source: National Science Foundation
Silver molybdate microrods are self-assembled into micron sized, broom-like and flower-like structures. Our investigations indicate that through a simple hydrothermal process, large scale production of such structure is possible. Using ammonium molybdate and silver nitrate solutions as precursors, we were able to show that the self assembled architectures were dependent on the pH of the starting precursor material. To understand the formation and destructions of the flower-like morphology, a systematic broad range (from acidic to basic) of pH-controlled experiments were performed and its influence on the structure/microstructure of synthesized materials was investigated. Scanning electron microscopy studies revealed that the morphology and microstructure of the products varied significantly by changing pH values from 3 to 8 during mixing of the reactants. pH = 3 and 4 resulted in the self assembly of monoclinic Ag-2(Mo2O7) microrods into broom-like structures, whereas pH = 5 resulted into the flower-like morphology of mixed phase of monoclinic and triclinic Ag2Mo2O7. We also found that increasing the pH after a certain threshold value (for example pH > 6) resulted in total collapse of the flower-like morphology. Further increase of the pH to 7 and 8 resulted, the formation of microparticles of Ag2MoO4. A tentative scheme based on the pH-driven evolution of the self-assembly has been given to explain the formation of the observed heterostructures. Preliminary electrical characterization of thin films of the flower-like structures rendered non-linear current-voltage (I-V) responses. We also observed a strong hysteresis in the I-V responses of the flower-like structures developed under high bias conditions.
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