摘要
以铜氨离子为铜源,水合肼为还原剂,在表面预氧化的SiC表面,采用一步原位化学沉积法制备了均匀包裹Cu颗粒的SiC复合粉体.采用扫描电子显微镜(SEM)、X射线衍射(XRD)、傅立叶红外光谱(FT-IR)、Zeta电位等测试表征手段研究了工艺条件对原位沉积反应的影响.研究发现SiC表面预氧化形成的SiO2层能显著增强对铜氨离子吸附能力,有助于原位还原生成单质Cu,形成近乎连续包裹层.控制反应体系中铜氨离子浓度和反应温度可以影响反应速率,从而控制Cu颗粒的沉积速率和包裹效果.对比研究表明,在0.2 mol/L铜氨离子溶液中70℃反应,在预氧化的SiC表面能够获得最佳包裹层.
A facile one-step in-situ chemical deposition method was introduced to synthesize Cu-Coated SiC composite powders,using [Cu（NH3）4]2＋ ions as copper source and N2H4.H2O as reductant,respectively.Scanning electronic microscope（SEM）,X-Ray diffraction（XRD）,Fourier transform infrared spectroscope（FT-IR） and Zeta potential were used to investigate the structure,morphology and composition of the prepared core/shell composite powders.The corresponding formation mechanism was proposed based on the comparative study.It is revealed that the SiO2 film on the surfaces of pre-oxidated SiC particles can effectively enhance the adsorption of [Cu（NH3）4]2＋ ions toward the negatively charged surface,which is favorable to the following in-situ reduction by N2H4.H2O around SiC particles.Nearly continuous Cu coating can be formed by changing the reaction process.The concentration of [Cu（NH3）4]2＋ ions and reaction temperature affect the reaction rate and coating structure.The process parameters are optimized to obtain the best coating structure with [Cu（NH3）4]2＋ ions concentration of 0.2 mol/L and reaction temperature of 70℃,respectively.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第8期795-799,共5页
Journal of Inorganic Materials
基金
江苏省产学研前瞻性联合研究项目(BY2009129)
江苏省基础研究计划(自然科学基金)项目(BK2009565)
苏州市科技项目(SWG0905)~~
