| 查看: 4225 | 回复: 115 | |||||||||||||||||||
| 【奖励】 本帖被评价111次，作者xiejf增加金币 87.6 个 | |||||||||||||||||||
xiejf专家顾问 (文学泰斗)
|
[资源]
Acc. Chem. Res.最新综述：化学气相沉积法合成的石墨烯的多晶和堆积
|
||||||||||||||||||
|
最新一期的Acc. Chem. Res.刊发了美国康奈尔大学Jiwoong Park课题组撰写的题为Polycrystallinity and Stacking in CVD Graphene的研究性综述，主要讲述了化学气相沉积（CVD）法合成的石墨烯存在的多晶现象和堆积方式，以及多晶石墨烯/多层石墨烯相关的性质。文章11页，引文37篇。 Graphene, a truly two-dimensional hexagonal lattice of carbon atoms, possesses remarkable properties not seen in any other material, including ultrahigh electron mobility, high tensile strength, and uniform broadband optical absorption. While scientists initially studied its intrinsic properties with small, mechanically exfoliated graphene crystals found randomly, applying this knowledge would require growing large-area films with uniform structural and physical properties. The science of graphene has recently experienced revolutionary change, mainly due to the development of several large-scale growth methods. In particular, graphene synthesis by chemical vapor deposition (CVD) on copper is a reliable method to obtain films with mostly monolayer coverage. These films are also polycrystalline, consisting of multiple graphene crystals joined by grain boundaries. In addition, portions of these graphene films contain more than one layer, and each layer can possess a different crystal orientation and stacking order. In this Account, we review the structural and physical properties that originate from polycrystallinity and stacking in CVD graphene. To begin, we introduce dark-field transmission electron microscopy (DF-TEM), a technique which allows rapid and accurate imaging of key structural properties, including the orientation of individual domains and relative stacking configurations. Using DF-TEM, one can easily identify “lateral junctions,” or grain boundaries between adjacent domains, as well as “vertical junctions” from the stacking of graphene multilayers. With this technique, we can distinguish between oriented (Bernal or rhombohedral) and misoriented (twisted) configurations. The structure of lateral junctions in CVD graphene is sensitive to growth conditions and is reflected in the material’s electrical and mechanical properties. In particular, grain boundaries in graphene grown under faster reactant flow conditions have no gaps or overlaps, unlike more slowly grown films. These structural differences can affect the material’s electrical properties: for example, better-connected grain boundaries are more electrically conductive. However, grain boundaries in general are mechanically weaker than pristine graphene, which is an order of magnitude stronger than CVD graphene based on indentation measurements performed with an atomic force microscope. Vertical junctions in multilayer CVD graphene have two key structural features. First, bilayer graphene (BLG) with Bernal stacking exists in two mirrored configurations (AB or AC) that also form isolated domains. Similarly, oriented trilayer graphene also has alternating ABA and ABC stacked layers. Second, in twisted multilayer graphene, stacked layers lack long-range atomic registry and can move freely relative to each other, which generates unique optical properties. In particular, an interlayer optical excitation produces strong Raman and absorption peaks, dependent on the twist angle. A better understanding of the structural and physical properties of grain boundaries and multilayers in CVD graphene is central to realizing the full potential of graphene in large-scale applications. In addition, these studies provide a model for characterizing other layered materials, such as hexagonal boron nitride and MoS2, where similar polycrystallinity and stacking are expected when grown in large areas. .  Polycrystallinity and Stacking in CVD Graphene.jpg  ar-2012-00190z_0008.gif [ 来自科研家族 材料家族 ] |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：libolin3@tal.com - 附件 1 : PolycrystallinityandStackinginCVDGraphene.pdf
2012-11-08 12:06:04, 2.35 M
» 收录本帖的淘贴专辑推荐
 石墨烯知识汇总 | 锂电资源共享 | 英文文献或者教材 | 先进材料 |
| 科研资料 | 石墨烯与碳纳米管 | 石墨烯制备及应用 | 纳米化学/电化学综述 |
| 电化学电源、电源管理 | nano review | 综述精华集 | 纳米碳材料 |
| 万花筒 | 宇宙超级无敌霹雳囧死人不偿命纳米材料（石 | 碳纳米管石墨烯精华 |
» 猜你喜欢
中国科学技术大学@苏州·独墅会议，报销国际差旅，诚邀您的参加！
已经有0人回复
-
CV测试为什么非常不稳定
已经有14人回复
-
无机化学论文润色/翻译怎么收费?
已经有104人回复
-
中山大学孙逸仙纪念医院潘越教授团队招聘博士后（年薪45万），助理实验师
已经有17人回复
-
北京求能测金属粘度的地方
已经有4人回复
-
金属粘度测量
已经有0人回复
-
金属氧化物及氢氧化物电导率/电阻率
已经有0人回复
-
olex2 单晶解析
已经有0人回复
-
高频磁性能
已经有0人回复
-
分子筛脱铝
已经有3人回复
» 本主题相关商家推荐: (我也要在这里推广)
9楼2012-11-08 16:08:02
yuan999
专家顾问 (知名作家)
-
专家经验: +355 - MN-EPI: 1
- 应助: 1293 (讲师)
- 贵宾: 0.247
- 金币: 19581.1
- 帖子: 6247
- 在线: 616小时
- 虫号: 591578
28楼2012-11-09 14:36:57
简单回复
ovidchen2楼
2012-11-08 13:30
回复
五星好评 顶一下，感谢分享！
夜冷冷3楼
2012-11-08 13:50
回复
五星好评 顶一下，感谢分享！
2012-11-08 13:53
回复
五星好评 顶一下，感谢分享！
2012-11-08 13:54
回复
五星好评 顶一下，感谢分享！
2012-11-08 15:18
回复
五星好评 顶一下，感谢分享！
w_wwb7楼
2012-11-08 15:24
回复
五星好评 顶一下，感谢分享！
瞬～8楼
2012-11-08 15:36
回复
五星好评 
gengxin6010楼
2012-11-08 16:33
回复
五星好评 顶一下，感谢分享！
34610624111楼
2012-11-08 17:02
回复
五星好评 顶一下，感谢分享！
xzb32812楼
2012-11-08 18:18
回复
五星好评 顶一下，感谢分享！
swllover13楼
2012-11-08 18:21
回复
五星好评 顶一下，感谢分享！
silina82314楼
2012-11-08 18:41
回复
五星好评 顶一下，感谢分享！
luoxinfire15楼
2012-11-08 19:09
回复
五星好评 顶一下，感谢分享！
牛虻吹泡泡16楼
2012-11-08 19:31
回复
五星好评 顶一下，感谢分享！
阿梨子17楼
2012-11-08 19:54
回复
五星好评 顶一下，感谢分享！
scorptionlin18楼
2012-11-08 20:32
回复
五星好评 顶一下，感谢分享！
风见青衣19楼
2012-11-08 21:01
回复
五星好评 顶一下，感谢分享！
6块520楼
2012-11-08 22:15
回复
五星好评 顶一下，感谢分享！
baixy201021楼
2012-11-09 07:15
回复
五星好评 顶一下，感谢分享！
0702130822楼
2012-11-09 08:32
回复
五星好评 顶一下，感谢分享！
bruce_tian23楼
2012-11-09 08:45
回复
五星好评 顶一下，感谢分享！
wonderflyer24楼
2012-11-09 08:58
回复
五星好评 顶一下，感谢分享！
yifeixian25楼
2012-11-09 09:02
回复
五星好评 顶一下，感谢分享！
spyan58126楼
2012-11-09 09:18
回复
五星好评 顶一下，感谢分享！
delphoenix27楼
2012-11-09 12:30
回复
五星好评 顶一下，感谢分享！
dabizi_91129楼
2012-11-09 15:54
回复
五星好评 顶一下，感谢分享！
tianyiking30楼
2012-11-09 21:42
回复
五星好评 顶一下，感谢分享！
stones200031楼
2012-11-09 22:28
回复
五星好评 顶一下，感谢分享！
fmbs11032楼
2012-11-09 23:03
回复
五星好评 顶一下，感谢分享！
yourmoon33楼
2012-11-10 07:11
回复
五星好评 顶一下，感谢分享！
leaolf34楼
2012-11-10 08:22
回复
五星好评 顶一下，感谢分享！
gaegel35楼
2012-11-10 08:47
回复
五星好评 顶一下，感谢分享！
明月千里36楼
2012-11-10 09:34
回复
五星好评 顶一下，感谢分享！
lovinghui37楼
2012-11-10 09:38
回复
五星好评 顶一下，感谢分享！
hanjh0501a38楼
2012-11-10 11:07
回复
五星好评 顶一下，感谢分享！
torrxi39楼
2012-11-10 12:43
回复
五星好评 顶一下，感谢分享！
youngwentao40楼
2012-11-10 13:41
回复
五星好评 顶一下，感谢分享！
zym100341楼
2012-11-12 07:40
回复
五星好评 顶一下，感谢分享！
51zhuce42楼
2012-11-12 09:02
回复
顶一下，感谢分享！
lj110843楼
2012-11-12 11:45
回复
五星好评 顶一下，感谢分享！
mxmalice44楼
2012-11-12 12:40
回复
五星好评 顶一下，感谢分享！
Actor200645楼
2012-11-12 13:04
回复
五星好评 顶一下，感谢分享！
29753385346楼
2012-11-12 19:00
回复
五星好评 顶一下，感谢分享！
凤雏卧龙47楼
2012-11-12 20:18
回复
五星好评 顶一下，感谢分享！
daylike9948楼
2012-11-12 22:43
回复
五星好评 顶一下，感谢分享！
北伐将军49楼
2012-11-13 08:47
回复
五星好评 顶一下，感谢分享！
shanruhai50楼
2012-11-13 21:04
回复
五星好评 顶一下，感谢分享！
5