Research on CuSn nanotree formationmechanism and its application to higly sensitive gas sensor

2014 Fiscal Year Final Research Report

• Project/Area Number: 25600048
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nanomaterials engineering
• Research Institution: Kansai University
• Principal Investigator: SHINGUBARA Shoso 関西大学, システム理工学部, 教授 (10231367)
• Co-Investigator(Kenkyū-buntansha): TADA Yoshihiro 室蘭工業大学, 大学院工学(系)研究科(研究院), 助教 (30637202)
• Co-Investigator(Renkei-kenkyūsha): SHIMIZU Tomohiro 関西大学, システム理工学部, 准教授 (80581165)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: ナノツリー / 電解めっき / CuSn合金 / 単結晶 / センサー / バッテリー電極 / 単結晶

Outline of Final Research Achievements

Three-dimensional nano-tree-like structures consisting of single-crystalline CuSn alloy nanowires branching perpendicularly from their parent branches were observed. The nano-trees were formed by constant potential co-electrodeposition, and the cathode potential range that allowed the growth of the nano-tree structure was very narrow, as small as 0.01 V. The geometry of the branches had a four-fold symmetry around the parent branch. XRD and TEM analysis revealed that the nanowire branches consisted of single-crystalline &#61543;-CuSn, and there were two preferential growth directions: <100> and <110>. The addition of polyethylene glycol (PEG) with a molecular weight of 1000 in the plating bath is essential for the formation of the nano-tree structure. It is speculated that adsorbed PEG molecules on CuSn crystal planes with high Miller indices suppress CuSn alloy deposition, enhancing anisotropic growth of the CuSn crystal to form the nano-tree structure.

Free Research Field

ナノ材料科学