原子状态下实时监控材料表面变化
文章来源:未知 文章作者:enread 发布时间:2016-03-16 06:12 字体: [ ]  进入论坛
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A team of researchers at Aix Marseille Université in Marseille, France led by Dr. Frédéric Leroy developed a technique that allows them to follow physical processes occurring at surfaces of materials at the atomic level in situ and in real time. This new process allowed the research team to study the kinetics of decomposition1 of a thin layer of silicon2 dioxide deposited onto silicon during a thermal4 treatment, a critical component5 in micro-electronics. The approach is based on the principles of electron microscopy. Silicon dioxide is one of the most important building blocks of micro-electronics and its thermal stability is critical to device performance. The decomposition of a thin layer of silicon dioxide onto silicon has been the focus of great scientific interest for four decades. Previous studies show that the decomposition occurs non-homogeneously at the surface via the local formation of holes in the oxide3 layer that extend laterally6. Understanding the elementary atomic processes responsible for the opening velocity7 of these holes is necessary to improve the silicon oxide performance. 
 
For the research team to achieve a better understanding of nanomaterials properties, advanced characterization tools were needed. 
 
"We needed to be able to characterize the structural8 (crystallography, size, shape) and the chemical properties at the same time and to be able to follow in situ and in real time the changes during a given process for a rapid feedback on the experimental parameters9," Leroy explained. "Our approach based on low energy electron microscopy is the corner stone of our achievements."
 
However, even with the new instrument, the team encountered challenges. Obtaining real time measurements of the thermal decomposition of the silicon dioxide was particularly difficult since the complete process occurs in just a few minutes in a narrow temperature window. 
 
"It was impossible to adjust all control parameters of the electron microscope before the decomposition process started since silicon dioxide is amorphous10, so we had to adjust finely the settings within a few seconds as soon as the oxide decomposes11 in order to characterize the whole process," Leroy explained.


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1 decomposition AnFzT     
n. 分解, 腐烂, 崩溃
参考例句:
  • It is said that the magnetite was formed by a chemical process called thermal decomposition. 据说这枚陨星是在热分解的化学过程中形成的。
  • The dehydration process leads to fairly extensive decomposition of the product. 脱水过程会导致产物相当程度的分解。
2 silicon dykwJ     
n.硅(旧名矽)
参考例句:
  • This company pioneered the use of silicon chip.这家公司开创了使用硅片的方法。
  • A chip is a piece of silicon about the size of a postage stamp.芯片就是一枚邮票大小的硅片。
3 oxide K4dz8     
n.氧化物
参考例句:
  • Oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见。
  • How can you get rid of this oxide coating?你们该怎样除去这些氧化皮?
4 thermal 8Guyc     
adj.热的,由热造成的;保暖的
参考例句:
  • They will build another thermal power station.他们要另外建一座热能发电站。
  • Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。
5 component epSzv     
n.组成部分,成分,元件;adj.组成的,合成的
参考例句:
  • Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
  • Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。
6 laterally opIzAf     
ad.横向地;侧面地;旁边地
参考例句:
  • Shafts were sunk, with tunnels dug laterally. 竖井已经打下,并且挖有横向矿道。
  • When the plate becomes unstable, it buckles laterally. 当板失去稳定时,就发生横向屈曲。
7 velocity rLYzx     
n.速度,速率
参考例句:
  • Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
  • The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。
8 structural itXw5     
adj.构造的,组织的,建筑(用)的
参考例句:
  • The storm caused no structural damage.风暴没有造成建筑结构方面的破坏。
  • The North American continent is made up of three great structural entities.北美大陆是由三个构造单元组成的。
9 parameters 166e64f6c3677d0c513901242a3e702d     
因素,特征; 界限; (限定性的)因素( parameter的名词复数 ); 参量; 参项; 决定因素
参考例句:
  • We have to work within the parameters of time. 我们的工作受时间所限。
  • See parameters.cpp for a compilable example. This is part of the Spirit distribution. 可编译例子见parameters.cpp.这是Spirit分发包的组成部分。
10 amorphous nouy5     
adj.无定形的
参考例句:
  • There was a weakening of the intermolecular bonds,primarily in the amorphous region of the polymer.分子间键合减弱,尤其在聚合物的无定形区内更为明显。
  • It is an amorphous colorless or white powder.它是一种无定形的无色或白色粉末。
11 decomposes 104d7ddd5cfb119e99319744ced0efe9     
腐烂( decompose的第三人称单数 ); (使)分解; 分解(某物质、光线等)
参考例句:
  • The debris slowly decomposes into compost. 这些垃圾慢慢地分解成了堆肥。
  • Plastic is a substance that hardly decomposes in the nature. 塑料是一种在自然中极难降解的物质。
TAG标签: time materials atomic
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