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运用电化学方波电位法,在氧化铟锡(ITO)透明导电膜玻璃基底上实现AuPd纳米粒子的形状控制合成.当固定方波下限电位0.30 V,上限电位分别为0.64和0.70 V时,分别制备出内凹三八面体(TOH)和内凹六八面体(HOH)AuPd合金纳米粒子.运用扫描电镜(SEM)、X射线能量散射谱(EDX)和电化学循环伏安法表征所制备的纳米粒子,结果表明所制备的AuPd纳米粒子在ITO上分散均匀,具有清晰的内凹三八面体和内凹六八面体的形状,Au:Pd元素比均接近3:1.但由于Au比Pd的表面自由能低,导致Au在AuPd合金纳米粒子表面富集.发现从合成的TOH AuPd合金纳米粒子出发,对其施加下限电位0.30 V、上限电位0.70 V的方波电位处理,可实现由TOH向HOH形状转变;延长方波电位处理时间仅改变AuPd合金纳米粒子的尺寸,但HOH形状保持不变.
The shape control synthesis of AuPd nanoparticles was achieved by electrochemical square wave potentiometry on the indium tin oxide (ITO) transparent conductive glass substrate.When the fixed square wave lower limit potential was 0.30 V and the upper limit potential was 0.64 and 0.70 V respectively, The concave octahedra (TOH) and the concave hexaoctahedral (HOH) AuPd alloy nanoparticles were prepared by SEM, XRD, EDX and electrochemical cyclic voltammetry The results showed that the prepared AuPd nanoparticles were uniformly dispersed on ITO with the shapes of concave octahedra and concave octahedron, and the ratios of Au: Pd were all close to 3: 1. However, because Au was more stable than Pd Surface free energy is low, resulting in the enrichment of Au on the surface of AuPd alloy nanoparticles.From the synthesized TOH AuPd alloy nanoparticles, it was found that applying a square wave potential treatment with a lower limit potential of 0.30 V and an upper limit potential of 0.70 V, To HOH shape; extend the square wave potential processing time only to change the size of AuPd alloy nanoparticles, but the HOH shape remains unchanged.