纳米尺寸对网中的位的影响
Hiroshi Akiba1, Maiko Kofu1, Hirokazu Kobayashi2
1Institute for Solid State Physics, University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.
Journal of the American Chemical Society
|July 28, 2016
概括
化物纳米颗粒中的原子占据了独特的四面体位置,与散装材料不同. 这一发现揭示了纳米材料中新位点的占用.
科学领域:
- 材料科学
- 纳米技术
- 固态化学
背景情况:
- 由于尺寸和表面效应,纳米材料具有独特的特性.
- 化是一种广泛研究的金属化,用于催化和储存.
- 了解原子的位置对于预测材料的行为至关重要.
研究的目的:
- 调查化物纳米颗粒中的原子位置.
- 将纳米粒子中的位占用率与散装化物进行比较.
- 探索温度对纳米晶体中的分布的影响.
主要方法:
- 在化物 (PdH0.363) 纳米晶体 (8.0 ± 0.9 nm) 上进行了中子粉衍射实验.
- 在不同温度 (300 K,150 K和44 K) 进行实验.
- 瑞特维尔德分析被用来确定晶格中的原子位置.
主要成果:
- 在化纳米颗粒中,30%的原子占有四面体位,而70%占有八面体位.
- 这与散装化物形成鲜明对比,通常只有八面体位点被占用.
- 取决于温度的分析表明四面体位点占用量有限,可能是纳米粒子的地下区域.
结论:
- 这项研究是第一个确定金属纳米粒子中的原子位置.
- 在化纳米颗粒中独特的分布表明了纳米级相互作用的新机制.
- 这些发现为纳米尺度的金属化物行为提供了基本的见解,
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