Mapping the thermal entrenchment behavior of Pd nanoparticles on planar SiO2 supports.,Nanoscale

当前位置： X-MOL 学术 › Nanoscale › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mapping the thermal entrenchment behavior of Pd nanoparticles on planar SiO2 supports.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-22 , DOI: 10.1039/d0nr02941f
Abha Gosavi ₁ , Chad Mirkin , Justin Notestein

Affiliation

Thermal treatment of metal nanoparticles at temperatures above 1000 °C leads to the formation of nanopores in amorphous SiO₂ planar supports. In this work, we employ Pd/SiO₂ as a model system to investigate how the initial size and distribution of nanoparticles on the SiO₂ surface affects the behavior of the nanoparticles at high temperatures with respect to the formation of nanopores and related structures. We also examine the role of physical processing parameters such as heating temperature, ramp rate, and heating time in altering the type, size, and number density of features formed. These studies reveal that nanopore formation competes with other surface phenomena, including nanoparticle agglomeration and encapsulation, which also occur at high temperatures. We establish that the dominant behavior, among the many competing phenomena occurring at the metal–oxide interface, depends on the initial surface distribution of the nanoparticles. Using this knowledge, we show that the final nanopore diameter and surface density are highly tunable.

中文翻译：

绘制Pd纳米粒子在平面SiO2载体上的热行为。

在高于1000°C的温度下对金属纳米颗粒进行热处理会导致在无定形SiO ₂平面载体中形成纳米孔。在这项工作中，我们采用Pd / SiO ₂作为模型系统来研究纳米颗粒在SiO ₂上的初始尺寸和分布就纳米孔和相关结构的形成而言，表面影响纳米颗粒在高温下的行为。我们还研究了物理处理参数（例如加热温度，升温速率和加热时间）在改变形成的特征的类型，大小和数量密度中的作用。这些研究表明，纳米孔的形成与其他表面现象相竞争，包括纳米颗粒的团聚和封装，这些现象也在高温下发生。我们确定，在金属-氧化物界面发生的许多竞争现象中，主要行为取决于纳米粒子的初始表面分布。利用这些知识，我们表明最终的纳米孔直径和表面密度是高度可调的。

更新日期：2020-07-09

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11