Controlled Deposition of Nano-scale Dots by Electrochemical Processes

2001 Fiscal Year Final Research Report Summary

• Project/Area Number: 12650694
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Nagaoka University of Technology
• Principal Investigator: MATSUBARA Hiroshi Nagaoka University of Technology, Analysis and Instrumentation Center, Associate professor, 分析計測センター, 助教授 (00202325)
• Project Period (FY): 2000 – 2001
• Keywords: Quantum dot / Electroless deposition / Displacement deposition

Research Abstract

Some unusual physical properties will come out from the materials made of nano-sized microdots, quantum dot, in which movement of electrons is limited in a very small area. New electronic devices that have revolutionary excellent functions will be expected by using such new materials. In this study the investigator aims to realize the nano-scaled microdots by means of wet processes, especially electrochemical processes such as electroless deposition and displacement deposition. The investigator revealed that initial deposits of electroless deposition were suitable for the nano-sized dots. Nickel nano-dots were fabricated by electroless deposition. Density of the dots was controlled by the number of catalyzation cycles and pH of solutions. The controlled deposition was realized by monitoring the deposition process with a newly developed QCM technique. Ruthenium and palladium nano-dots were also fabricated by means of displacement deposition. Ruthenium and palladium cations were easily reduced by electrons supplied from an oxidation process of tin (II) ion to tin (IV) ion in aqueous solutions. The ruthenium coverage of 30 - 70% was obtained from the process. From the results shown above, several kinds of nano-sized dots were successfully fabricated by the investigator.