| 查看: 619 | 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
一志愿A区211，22408 321求调剂
已经有8人回复
-
295分求调剂
已经有6人回复
-
一志愿中科大材料与化工，353分还有调剂学校吗
已经有13人回复
-
085600材料与化工调剂
已经有6人回复
-
320求调剂
已经有6人回复
-
期刊推荐
已经有5人回复
-
有没有接收比较快的sci期刊呀，最好在一个月之内的，研三孩子求毕业
已经有7人回复
-
又一批高校组建人工智能学院 师资行吗 不是骗人吗
已经有4人回复
-
337求调剂
已经有3人回复
-
申博/考博
已经有5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
20