纳米铜粉的制备及其分散性研究

采用液相还原法制备纳米铜粉和纳米铜胶体,选用十六烷基三甲基溴化铵(CTAB)或聚乙烯吡咯烷酮(PVP)为分散剂,通过X射线衍射仪、扫描电镜对纳米铜粉进行表征,通过重力沉降法测试纳米铜胶体的稳定性。结果表明:液相还原法能够制备纯度较高的纳米铜粉;CTAB浓度为0.12 mol/L时,铜粉平均粒径最小,为20 nm,CTAB浓度为0.14 mol/L且超声粉碎20 min时,纳米铜胶体最稳定;PVP浓度为6×10^-4 mol/L时,铜粉平均粒径最小,为20 nm,PVP浓度为7×10^-4 mol/L且超声粉碎20 min时,纳米铜胶体最稳定。

Study on Preparation and Dispersion of Nanometer Copper Powder

Nanometer copper powder and nanometer copper colloid were prepared by liquid phase reduction method, CTAB and PVP were used as dispersants. The nanometer copper powders were characterized by X-ray diffraction and SEM, and the stability of nanometer copper colloid was tested by gravity sedimentation. The results show that the liquid-phase reduction method can produce nanometer copper powders with high purity. When the concentration of CTAB is 0.12 mol/L, the average particle size of copper powders is the smallest, 20 nm. When the concentration of CTAB is 0.14 mol/L and the ultrasonic duration is 20 min, the stability of the nanometer copper colloid is the highest. When the concentration of PVP is 6×10-4 mol/L, the stability of the average particle size of copper powders is the smallest, 20 nm. When the concentration of PVP is 7×10-4 mol/L and the ultrasonic dispersion duration is 20 min, the stability of the nanometer copper colloid is the highest.