Preparation and Activation Mechanism of Pd Colloid with High Concentration and Performance
Qu Shuoshuo1,2; Zhu Qingsheng2; Gong Yadong1; Yang Yuying1; Li Caifu2; Gao Shian2
Corresponding AuthorZhu Qingsheng(
AbstractThe non-conductive substrate is often metallized through electroless plating method. Prior to the electroless plating, the substrate surfaces need to be firstly Pd activation pre-treated. The traditional "two-step" activation process, i.e., sensitization-activation, has been gradually obsoleted because of poor controllability and uniformity. A "one-step" activation process using Pd colloid has been widely used in industry, especially for the microvia metallization treatment in printed circuit board (PCB) fabrication. The bottleneck problem of this technology is the preparation of the Pd colloid solution with high concentration and excellent catalytic activity. The aim of this work is to develop a preparation method of the Pd colloid with high concentration and high quality. Pd colloid was prepared by a continuous reduction reaction with minor content. By mean of this process, the Pd concentration of the prepared colloid can exceed 2%. The morphology, microstructure and composition of the Pd colloid were characterized by SEM, TEM, XRD and XPS, respectively. The activate ability of the Pd colloid was examined by electroless Cu and electrochemical test. It was found that the average diameter of the Pd particles was less than 4 nm. Even if the concentration of Pd was less than 25 mg/L, this Pd colloid still had good activation ability for electro-less Cu. The result demonstrated that the shell structure of the Pd micelle played a key role for the activation ability. The shell of Pd micelle was consisted of Sn2+, Sn4+ and Cl-, and generally formed two structures, [PdSn2]Cl-6 and [PdSn3]Cl-8. For the structure of [PdSn3]Cl-8, the failure of the hydrolysis could lead to the loss of activation. The preparation method in this work can effectively avoid the occurrence of [PdSn3]Cl-8, which greatly improved the activation ability of the Pd colloid.
KeywordPd colloidal electroless Cu activation
Funding OrganizationNational Natural Science Foundation of China ; Science and Technology Program of Shenyang
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51471180] ; Science and Technology Program of Shenyang[F16-205-1-18]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000399921900013
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Document Type期刊论文
Corresponding AuthorZhu Qingsheng
Affiliation1.Northeastern Univ, Sch Mech Engn & Automat, Shenyang 110819, Peoples R China
2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Qu Shuoshuo,Zhu Qingsheng,Gong Yadong,et al. Preparation and Activation Mechanism of Pd Colloid with High Concentration and Performance[J]. ACTA METALLURGICA SINICA,2017,53(4):487-493.
APA Qu Shuoshuo,Zhu Qingsheng,Gong Yadong,Yang Yuying,Li Caifu,&Gao Shian.(2017).Preparation and Activation Mechanism of Pd Colloid with High Concentration and Performance.ACTA METALLURGICA SINICA,53(4),487-493.
MLA Qu Shuoshuo,et al."Preparation and Activation Mechanism of Pd Colloid with High Concentration and Performance".ACTA METALLURGICA SINICA 53.4(2017):487-493.
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