室温固相反应制备Keggin结构杂多酸铵盐纳米粒子

纳米材料由于其量子尺寸效应及表面效应而在磁、光、电等方面显示出许多常规粒子所不具有的特性[1] .纳米材料成功应用的实例及潜在应用前景推动了各种纳米粉末的合成及合成方法的发展 [2～ 4 ] .利用低温固相反应制备纳米粒子尚不多见 ,但已有报道 [5,6] .多金属氧酸盐因其独特的结构而具有较高的催化活性、导电性、磁性、光电致变色性以及抗病毒活性 ,因而有着广阔的应用前景 ,这些方面的研究已越来越引起人们的兴趣 [7～ 10 ] .本文采用室温固相反应首次制备了多金属氧酸盐纳米粒子 (NH4 ) 3PMo12 O4 0 · 9H2 O(1 )和 (NH4 ) 3PW12…

Preparation of Polyoxometalate Nanoparticles with Keggin Structure by Solid-state Reaction at Room Temperature

The polyoxometalate particles with Keggin structure, (NH₄)₃PMo₁₂O₄₀ ·9H₂O(1) and (NH₄)₃PW₁₂O₄₀ ·7H₂O(2), were prepared firstly by solid state reaction at room temperature. Their structure, particle sizes and appearances were characterized with elemental analyses, IR, XRD and TEM techniques. The size distribution of nanoparticle 1 is in the range of 5-14 nm, the mean size is 9 nm, and the size distribution of nanoparticle 2 is in the range of 3-12 nm, the mean size is 6 nm. It was found that the product H₂C₂O₄·2H₂O plays a critical role in preventing the nanoparticles from aggregating to large particles.