title: Novel Ag/Si composite particles through galvanic displacement and its conductive application.
abstract: Here we synthesized a novel Ag/Si composite sub-micro particle using galvanic displacement by capitalizing on the active chemical surface of Si particles sludge from wafer-slicing process. Si works as chemical reactant, as well as reaction site to form composite particles. Sequent structural characterizations and analysis which include X-ray diffraction, transmission electron microscopy, scanning electron microscope, energy dispersive X-ray and electrical properties of this composite particle were done. A well-proved hetero-epitaxial growth mechanism could explain Ag nano-island/layer with a satisfactory bond property deposited on the Si surface. Since these Si are mechanically cleaved from crystal, formed conductive Ag/Si composites retain the flake shape from Si sludge particles, and narrow size distribution. They are preferred as conductive fillers, an Ag/Si composite-based conductive ink was prepared, its conductance was tested through screen printing, film thickness and resistivity were measured. The resistivity reached the µΩ cm level, even without optimizing the ink formulation. Our methods not only convert this Si sludge into highly conductive composite particles as filler for applications, but also considerably reduce the consumption of precious metal.
authors.affiliation: College of Materials Science and Engineering, Hunan University, Changsha, 410012 Hunan China.
authors.forename: Chenfan
authors.initials: C
authors.lastname: Yang
authors.affiliation: College of Materials Science and Engineering, Hunan University, Changsha, 410012 Hunan China.
authors.forename: Xuelong
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Materials Science and Engineering, Hunan University, Changsha, 410012 Hunan China.
authors.forename: Tiezheng
authors.initials: T
authors.lastname: Lv
authors.affiliation: Department of Applied Chemistry, Harbin Institute of Technology, Harbin, 150001 China.
authors.forename: Lili
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Department of Applied Chemistry, Harbin Institute of Technology, Harbin, 150001 China.
authors.forename: Can
authors.initials: C
authors.lastname: Cui
authors.affiliation: Department of Applied Chemistry, Harbin Institute of Technology, Harbin, 150001 China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Materials Science and Engineering, Hunan University, Changsha, 410012 Hunan China.
authors.forename: Limei
authors.initials: L
authors.lastname: Cha
keywords: Chemical synthesis; Composites; Electrical properties; Transmission electron microscopy (TEM); X-ray diffraction