fontsize
Search

Undergraduate and Graduate Schools

Home > Undergraduate and Graduate Schools > Faculty Members List > Department of Mechanical Engineering > Sasano, Junji

Sasano, Junji

Affiliation Department of Mechanical Engineering
Title Assistant Professor
Fields of Research Electrochemistry/Surface Finishing
Degree Dr. Energy Science (Kyoto Univ.)
Academic Societies The Electrochemical Society of Japan / Surface Finishing Society of Japan/ The Electrochemical Society / The Chemical Society of Japan
E-mail sasano@me
Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL http://tf.me.tut.ac.jp/
Researcher information URL(researchmap) Researcher information

Research

We are focusing on the formation processes of the thin films composed of functional materials from aqueous solution by electrochemical or chemical deposition methods. My research themes are such as the formation of copper oxide thin films by chemical bath deposition, anodic electrodeposition of tungsten oxide thin films, and the development of composite electrodeposition with magnetically fixed particles.

Theme1:Formation of Copper Oxide Thin Films by Chemical Bath Deposition

Overview
A picture of copper-oxide films deposited on glass substrates by chemical bath deposition.

Chemical bath deposition (CBD) is a method to form thin films of functional materials on the substrates dipped in aqueous solutions containing several kinds of chemical substances. This method attracts attention as one of the soft-solution processes in which chemical reactions take place under ambient pressure and low temperature less than 100℃. However, the numbers of industrial applications of CBD are much less than that of electroless plating which is a similar solution-phase chemical process to CBD. This is because reaction baths for CBD are unstable although it has advantages that any catalyzing processes, which are essential for electroless plating, are not required. We are aiming at improving the solution stability by precise investigations of formation mechanisms of copper-oxide thin films by CBD.

Keywords

hemical bath deposition, Copper oxide, Kinetics of chemical reactions, electroless plating

Theme2:Anodic Electrodeposition of Tungsten Oxide Thin Films

Overview
Cross-sectional SEM image of anodically electrodeposited tungsten oxide film.

Devices utilizing electrochromism require electric power supply only when they are colored and breached; therefore, they obtain a lot of attention as promising display or cholor-tunable devices which are suitable for the forthcoming sustainable society. Materials based on tungsten oxides are popular electrochromic materials which have been intensively investigated. Tungsten oxides can be formed not only by wet processes such as sputtering and chemical vapor deposition but also by wet processes such as sol-gel methods and electrodeposition. Among them, electrodeposition is advantageous to practical realization because it doesn't require too expensive initial costs for the production facilities and is easy to be applied for the formation of thin films on large surface area of products. One of the conventional electrodeposition processes is a cathodic electrodeposition from precursors of peroxotungstates. However, we are developing the anodic deposition processes utilizing local pH decrease in the vicinity of electrodes due to oxygen evolution during anodization of aqueous solutions. The tungsten-oxide films formed by the anodic electrodeposition have different crystal structures from that formed by conventional cathodic electrodeposition; therefore, we think our films have potential applications not only for electrochromic materials but also for oxide-electronics materials or photocatalysts utilizing their characteristics as n-type semiconductors.

Keywords

Anodic electrodeposition, Tungsten oxides, Electrochromism, n-type semiconductor, photocatalysis

Theme3:Development of Composite Electrodeposition with Magnetically Fixed Particles

Overview
Cross-sectional SEM image of the composite film of electrodeposited nickel with nickel particles.

Composite electrodeposition is the electroplating method by which solid particles such as metal oxides or carbides suspended in aqueous solutions are co-deposited with matrix metals. Composite electrodeposition can induce superior functions which cannot be attained only by the matrix metals depending on the characteristics of the co-deposited particles. It is known that general composite electrodeposition methods have difficulties of homogeneous dispersion of the particles in the deposited films and instability of the electrolytic solutions without continuous agitation. To overcome these difficulties, we are developing the new composite electrodeposition process in which the open spaces of magnetic particles fixed on electrodes by magnetic forces are infiltrated with matrix metals by electrodeposition.

Keywords

Electroplating, Composite electrodeposition

Title of class

Machine Fundamental Experiments of Engineering (B11510110), Research Project (B11510080), Statistical Analysis (B11610160), Experimental Practice for Mechanical Engineering (B11610021, B11610023)


to Page top