Effect of annealing on the phase transition and morphology of Ag NPs on/in TiO2 rods synthesized by a polyol method
Effect of annealing on the phase transition and morphology of Ag NPs on/in TiO2 rods synthesized by a polyol method
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DOI：
10.1016/j.ceramint.2012.05.009
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发表时间：
2012-12-01
影响因子：
5.2
通讯作者：
Kim, Cheol Sang
中科院分区：
文献类型：
--
作者：
Amarjargal, Altangerel;Tijing, Leonard D.;Kim, Cheol Sang
在这项研究中，我们报告了退火（250-700摄氏度）的相变和形态的银（Ag）纳米粒子（NPs）上/二氧化钛（TiO 2）棒使用多元醇的方法制备。退火样品不仅显示出形态学变化，即，由于Ag NP部分溶解到TiO 2棒中，Ag NP的固-液（熔融）转变，以及在低退火温度下TiO 2棒的早期结晶和锐钛矿-金红石转变。这些发现，再加上XRD和FE-SEM分析，证实，在较高的退火处理，扩散和聚结导致的金属颗粒的大小和形状的变化，不仅在最外面的区域，但也是一个随机的分布和逐步增长的Ag团簇的内部界面区域。在这里，它表明，退火可以诱导形态的变化，以及化学状态和结构的Ag-TiO 2。本发明的多元醇合成的Ag-TiO 2复合材料也显示出改善的热稳定性。(C)2012 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
In this study, we report the effect of annealing (250-700 degrees C) on the phase transition and morphology of silver (Ag) nanoparticles (NPs) on/in titanium dioxide (TiO2) rods prepared using a polyol method. The annealed samples showed not only morphological change, i.e., a solid-to-liquid (melting) transition of Ag NPs due to its partial dissolution into the TiO2 rods, but also early stage anatase crystallization and anatase-rutile transformation of TiO2 rods under low annealing temperatures. Such findings, together with XRD and FE-SEM analyses, confirm that, upon higher annealing treatment, diffusion and coalescence leads to changes in the size and shape of the metal particles not only in the outermost regions, but also a random distribution and progressive growth of Ag clusters in the inner interface region. Here, it was shown that annealing can induce changes in morphology, as well as the chemical state and structure of Ag-TiO2. The present polyol-synthesized Ag-TiO2 composite also showed improved thermal stability. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.