Effect of gas environment on the properties of silver–glass composite powders with core–shell structure prepared by spray pyrolysis

• Published in: Journal of alloys and compounds Vol. 492; no. 1; pp. 723 - 730
• Main Authors: Koo, Hye Young, Yi, Jang Heui, Kim, Jung Hyun, Ko, You Na, Kang, Yun Chan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 04.03.2010; Elsevier
• Subjects: Chemical synthesis; Composite materials; Conduction; Core-shell structure; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Firing; Gas–solid reaction; Materials science; Materials synthesis; materials processing; Physics; Silver; Spray pyrolysis; Temperature; Thick films; Chemical synthesis; Gas–solid reaction; Powders; Spray pyrolysis; Gas solid reaction; Core shell structure; Spray coatings; Glass; Operating mode; Controlled atmospheres; Reducting atmosphere; Silver; Composite materials; Quaternary systems; Gas-solid reaction; Zinc oxide; Crystal structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.12.027

Silver–glass composite powders were directly prepared by using spray pyrolysis in various gas environments. The composite powders with a core–shell structure and a crystal structure of silver had a spherical shape and submicron size irrespective of the gas environments. The silver conducting thick films formed from the composite powders prepared using spray pyrolysis in air and Ar environments had dense structures and low pore volumes at firing temperatures of 450 and 500 °C. In contrast, the thick films formed from the composite powders prepared by spray pyrolysis in a reducing environment by applying H 2/N 2 or H 2/Ar mixture gases had porous structures. The silver conducting thick films formed from the composite powders prepared in air and Ar atmospheres had low specific resistances of 3 and 3.2 μΩ cm at a firing temperature of 450 °C. In contrast, the silver conducting thick films formed from the composite powders prepared in N 2 and reducing atmospheres had specific resistances of more than 4 μΩ cm at a firing temperature of 450 °C. The silver conducting thick films formed from the composite powders prepared in air, N 2, and Ar atmospheres had low specific resistances of 2.7, 2.1, and 1.8 μΩ cm at a firing temperature of 500 °C.