피도금 탄소재의 산처리가 무전해 동도금에 미치는 영향

• Published in: Biuletyn Uniejowski Vol. 49; no. 3; pp. 265 - 273
• Main Authors: 신아리(Ari Shin), 한준현(Jun Hyun Han)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2016
• Subjects: 기계공학; Acid treatment; Palladium; Electroless plating; Carbon; Functional group
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JKISE.2016.49.3.265

The effects of surface modification by nitric acid on the pre-treatment of electroless copper plating were investigated. Copper was electroless-plated on the nitric acid treated graphite activated by a two-step pre-treatment process (sensitization + activation). The chemical state and relative quantities of the various surface species were determined by X-ray photoelectron spectroscopy (XPS) after nitric acid modification or pre-treatment. The acid treatment increased the surface roughness of the graphite due to deep and fine pores and introduced the oxygen-containing functional groups (-COOH and O-C=O) on the surface of graphite. In the pre-treatment step, the high roughness and many functional groups on the nitric acid treated graphite promoted the adsorption of Sn and Pd ions, leading to the uniform adsorption of catalyst ($Pd^0$) for Cu deposition. In the early stage of electroless plating, a lot of tiny copper particles were formed on the whole surface of acid treated graphite and then homogeneous copper film with low variation in thickness was formed after 30 min.