Temperature-induced restructuring of self-assembled PtPd nanoparticle superlattices
Temperature-induced restructuring of self-assembled PtPd nanoparticle superlattices
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DOI：
10.1088/0957-4484/20/46/465604
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发表时间：
2009-11
期刊：
影响因子：
3.5
通讯作者：
Guoqiang Ren;Y. Xing
中科院分区：
文献类型：
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作者：
Guoqiang Ren;Y. Xing
在室温下制备了PtPd纳米粒子超晶格，并研究了它们在高温下的重构。PtPd纳米粒子为球形，直径为3.5 ± 0.3nm，表面活性剂为油酸和油胺。使用透射电子显微镜拍摄纳米颗粒超晶格的图像。用快速傅里叶变换（FFT）分析图像，揭示了超晶格是结晶的还是非晶的。结果发现，诱导PtPd超晶格从晶态到非晶态的相变的临界温度落在100 - 110 ° C的范围内。与此同时，热诱导的重组将较不有序的超晶格转变为更有序的超晶格，类似于退火。这对于3D超晶格尤其明显，其在重组后也显示出明确的晶界。
PtPd nanoparticle superlattices were prepared at room temperature and investigated for their restructuring at elevated temperatures. The PtPd nanoparticles were spherical with a diameter of 3.5 ± 0.3 nm and were capped with surfactants of oleic acids and oleylamine. Images of the nanoparticle superlattices were taken using a transmission electron microscope. Analysis of the images with fast Fourier transform (FFT) revealed whether the superlattices were crystalline or amorphous. It was found that the critical temperature that induced a phase transition of PtPd superlattices from a crystalline state to an amorphous state falls in the range of 100–110 °C. Meanwhile, heat-induced restructuring transformed less-ordered superlattices into better-ordered ones, similar to annealing. It was especially pronounced for 3D superlattices, which also showed well-defined grain boundaries after restructuring.