纳米钯粒子的超声制备与表征

Sonochemical Preparation and Characterization of Nano-Pd Particles

0 引言近年来，纳米材料因为在化学、光学、电学和磁学等性质方面具有诸多优越的性能受到人们的广泛关注。纳米钯作为良好的储氢材料、导电浆料。特别是多相催化材料而备受瞩目。制备纳米钯的技术亦随其在多相催化领域的应用而显得越发重要。目前制备不同形状和尺寸的钠米钯颗粒的方法有：在NaBH4的作用下化学还原PdCl2；磁力搅拌还原Pd（OAc）2及超声还原PdCl2等等。为了阻止钠米钯粒子的团聚．在这些制备过程中常添加一种或多种表面活性剂。其中超声方法以其特有的能量作用形式已发展成为制备纳米金属粒子的一种新型技术，相关的报道也较多。我们已利用超声技术合成了纳米银粒子同和Ga／PMMA核壳复合粒子同等。

Monodispersed nano-Pd particles were prepared by sonochemical reduction of a 1：12 molar mixture of palladium（Ⅱ） chloride （PdCl2）, and sodium dodecyl sulfate （SDS） in double deionized aqueous solution. The reducing substance was characterized by transmission electron microscopy （TEM） with selected area electron diffraction （SAED）, Fourier transform infrared results show that the reduction of Pd（Ⅱ） to metallic Pd ） and X-ray photo electron specstropy analysis （XPS）. The is achieved and that the obtained suspensions have a long life period. The Pd nanoparticles are highly dispersed and uniform in size （in the range of 1 -10 nm）. The protective effect of SDS for Pd nanoparticles was investigated and the results indicate that there are interactions between Pd and SDS.