摘要
研究了采用次磷酸钠作还原剂在涤纶织物上化学镀铜。分别采用X射线衍射(XRD)、扫描电镜(SEM)和能谱议(EDAX)分析化学镀铜层的晶体结构、表面形貌和镀层成分。分别用四探针法(ASTM F390)和双轴传输线法(ASTM D 4935-99)测量导电涤纶织物的表面电阻和电磁屏蔽效能。化学镀铜溶液的成分和操作条件对化学镀铜的沉积速度、镀层成分、结构和表面形貌具有重大的影响。化学镀铜的沉积速度随着温度、pH值和镍离子浓度的升高而加快,而且沉速度过快会导致镀层疏松。镍离子浓度的增加还导致镀层镍含量的增加从而使表面电阻明显增大。加入适量的亚铁氰化钾可以降低沉积速度,改善镀层结构和表面形貌,降低织物表面电阻。当Ni2+和K4Fe(CN)6浓度分别为0.0038mol/L和2×10-6时,可以获得最佳的化学镀铜层;当织物上铜镀层的重量为40g/m2时,在100MHz^20GHz频率范围内电磁屏蔽效能均可达到85dB以上。
Electroless copper plating on PET fabrics using hypophosphite as reducing agent was investigated. Crystal structure and surface morphology of electroless copper coating were investigated by X-ray diffraction and Scanning electronic microscope. The chemical composition of the copper deposits was determined using energy dispersive X-ray analysis （EDAX） attached to the SEM. The surface resistance Rs was measured by the fourprobe method described in ASTM F 390. The coaxial transmission line method （ASTM D 4935-99） was used to test the EMI shielding effectiveness of the conductive fabrics. The deposition rate, the deposit composition, structure and surface morphology were remarkably affected by solution component and operating condition. The deposition rate increased obviously with the increase of temperature, pH and nickel ion concentration. However, high deposition rate resulted in loose copper deposits and the surface of the deposits was rough. The surface resistance of copper-coated fabrics increased obviously with increase of nickel ions concentration in the solutions because of high nickel content in the deposits. The addition of K4 Fe（CN）6 to the solution could reduce the deposition rate and make the deposits become more compact, which reduced the surface resistance significantly. The copper deposit has an intensified （111） plane orientation with the addition of K4Fe（CN）6 to the plating bath. The color of the deposits also had a corresponding improvement, changing from dark-brown to copper-bright with the addition of K4 Fe（CN）6 to the plating solution. The conductive fabrics with high shielding effectiveness could be prepared at the optimum condition with 0.0038mol/L nickel ions and 2× 10^-6 K4Fe（CN）6. As the copper weight on the fabric was up to 40g/m^2 , the SE of copper-coated fabrics was more than 85dB at frequency ranging from 100MHz to 20GHz.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第5期782-786,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50401004)
关键词
化学镀铜
涤纶织物
次磷酸钠
沉积速度
表面电阻
electroless copper plating
PET fabric
hypophosphite
deposition rate
surface resistance
