Formation of fractal-like thin-film structures and their potential functions by atmospheric-pressure post processing

2014 Fiscal Year Final Research Report

• Project/Area Number: 25600124
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Plasma electronics
• Research Institution: The University of Shiga Prefecture (2014); Kyoto University (2013)
• Principal Investigator: SAKAI Osamu 滋賀県立大学, 工学部, 教授 (30362445)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: プラズマ加工 / ナノ材料 / 自己組織化

Outline of Final Research Achievements

In this study, we performed hydrazine generation by atmospheric-pressure microplasmas, and reduction reaction of metallic ions in the aqueous solution was observed, leading to formation of fractal-like Ag structures in a self-assembly process. Hydrazine generation was confirmed by ultra-violet ray absorption spectroscopy, which gave us estimated values of its density and optimization of the generation process. Using this hydrazine, after reduction reactions in the silver-nitrate solution, we observed fractal-like Ag-nanoparticle network structures whose fractal dimension was 1.6-1.9. Their electric properties were conductive or isolated, which indicates that this process is around the percolation threshold; the structure was partially transparent and has possibilities for future flexible transparent conductive films. Their optical properties include some abnormal absorption in the mid-infrared ray region which was not predicted from their chemical constituents.

Free Research Field

プラズマ理工学