| 查看: 608 | 回复: 4 | |||
| 当前主题已经存档。 | |||
leaflet22银虫 (小有名气)
|
[交流]
王中林又发science了
|
||
|
实验与计算模拟的完美结合 Science 9 June 2006: 1504-1508. Converting Ceria Polyhedral Nanoparticles into Single-Crystal Nanospheres Xiangdong Feng,1* Dean C. Sayle,2 Zhong Lin Wang,3,4,5* M. Sharon Paras,6 Brian Santora,1 Anthony C. Sutorik,6 Thi X. T. Sayle,2 Yi Yang,1 Yong Ding,3 Xudong Wang,3 Yie-Shein Her1 Ceria nanoparticles are one of the key abrasive materials for chemical-mechanical planarization of advanced integrated circuits. However, ceria nanoparticles synthesized by existing techniques are irregularly faceted, and they scratch the silicon wafers and increase defect concentrations. We developed an approach for large-scale synthesis of single-crystal ceria nanospheres that can reduce the polishing defects by 80% and increase the silica removal rate by 50%, facilitating precise and reliable mass-manufacturing of chips for nanoelectronics. We doped the ceria system with titanium, using flame temperatures that facilitate crystallization of the ceria yet retain the titania in a molten state. In conjunction with molecular dynamics simulation, we show that under these conditions, the inner ceria core evolves in a single-crystal spherical shape without faceting, because throughout the crystallization it is completely encapsulated by a molten 1- to 2-nanometer shell of titania that, in liquid state, minimizes the surface energy. The principle demonstrated here could be applied to other oxide systems. |
回复此楼» 猜你喜欢
338求调剂
已经有5人回复
-
11408，学硕276求调剂
已经有5人回复
-
材料化工调剂
已经有16人回复
-
267求调剂
已经有3人回复
-
调剂
已经有6人回复
-
290分材料工程085601求调剂 数二英一
已经有9人回复
-
085600 英一数二272求调剂
已经有18人回复
-
求调剂
已经有13人回复
-
调剂材料学硕
已经有3人回复
-
085602化学工程350，调剂，有没有211的
已经有7人回复
xiaosan
荣誉版主 (著名写手)
Nanowires
- 应助: 0 (幼儿园)
- 贵宾: 2
- 金币: 3223.1
- 散金: 350
- 红花: 3
- 帖子: 1015
- 在线: 37.5小时
- 虫号: 120
- 注册: 2003-02-28
- 性别: GG
- 专业: 新型信息器件
2楼2006-06-09 10:40:16
3楼2006-06-09 21:49:11
4楼2006-06-09 23:10:07
5楼2006-06-10 20:02:14
5
