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Proton-assisted growth of ultra-flat graphene films 期刊论文
NATURE, 2020, 577 (7789) : 204-+
作者:  Yuan, Guowen;  Lin, Dongjing;  Wang, Yong;  Huang, Xianlei;  Chen, Wang;  Xie, Xuedong;  Zong, Junyu;  Yuan, Qian-Qian;  Zheng, Hang;  Wang, Di;  Xu, Jie;  Li, Shao-Chun;  Zhang, Yi;  Sun, Jian;  Xi, Xiaoxiang;  Gao, Libo
收藏  |  浏览/下载:35/0  |  提交时间:2020/07/03

Graphene films grown by chemical vapour deposition have unusual physical and chemical properties that offer promise for applications such as flexible electronics and high-frequency transistors(1-10). However, wrinkles invariably form during growth because of the strong coupling to the substrate, and these limit the large-scale homogeneity of the film(1-4,11,12). Here we develop a proton-assisted method of chemical vapour deposition to grow ultra-flat graphene films that are wrinkle-free. Our method of proton penetration(13-17) and recombination to form hydrogen can also reduce the wrinkles formed during traditional chemical vapour deposition of graphene. Some of the wrinkles disappear entirely, owing to the decoupling of van der Waals interactions and possibly an increase in distance from the growth surface. The electronic band structure of the as-grown graphene films shows a V-shaped Dirac cone and a linear dispersion relation within the atomic plane or across an atomic step, confirming the decoupling from the substrate. The ultra-flat nature of the graphene films ensures that their surfaces are easy to clean after a wet transfer process. A robust quantum Hall effect appears even at room temperature in a device with a linewidth of 100 micrometres. Graphene films grown by proton-assisted chemical vapour deposition should largely retain their intrinsic performance, and our method should be easily generalizable to other nanomaterials for strain and doping engineering.


  
Temperature and production efficiency growth: empirical evidence 期刊论文
CLIMATIC CHANGE, 2019, 156: 209-229
作者:  Kumar, Surender;  Khanna, Madhu
收藏  |  浏览/下载:17/0  |  提交时间:2019/11/27
Temperature  Production efficiency growth  Stochastic frontier analysis (SFA)  Non-linear effects  
Response of height growth of regenerating trees in a Pinus tabulaeformis Carr. plantation to different thinning intensities 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 444: 280-289
作者:  Wang, Zhibin;  Yang, Haijiao;  Wang, Dihai;  Zhao, Zhong
收藏  |  浏览/下载:46/0  |  提交时间:2019/11/27
Chinese pine plantation  Thinning intensity  Height growth  Regeneration  Linear mixed-effects model  
The Circular Economy: Swings and Roundabouts? 期刊论文
ECOLOGICAL ECONOMICS, 2019, 158: 11-19
作者:  Millar, Neal;  McLaughlin, Eoin;  Borger, Tobias
收藏  |  浏览/下载:24/0  |  提交时间:2019/04/09
Circular Economy  Sustainable Development  Linear economy  Social equity  Economic growth  Environmental degradation  
Defining and Measuring the Circular Economy: A Mathematical Approach 期刊论文
ECOLOGICAL ECONOMICS, 2019, 157: 369-372
作者:  Garcia-Barragan, Juan F.;  Eyckmans, Johan;  Rousseau, Sandra
收藏  |  浏览/下载:14/0  |  提交时间:2019/04/09
Recycling  Circular economy  Linear economy  Circular economic growth  Circular economy metric  
Do Mature Economies Grow Exponentially? 期刊论文
ECOLOGICAL ECONOMICS, 2018, 147: 123-133
作者:  Lange, Steffen;  Puetz, Peter;  Kopp, Thomas
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09
Per capita gross domestic product  Economic growth  Exponential growth  Linear growth  Time series analysis  Post-growth  Degrowth  Secular stagnation  Theories of economic growth  
Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (3) : 1271-1276
作者:  Yu, Xiongdong;  Yuan, Zhigang;  Huang, Shiyong;  Yao, Fei;  Wang, Dedong;  Funsten, Herbert O.;  Wygant, John R.
收藏  |  浏览/下载:22/0  |  提交时间:2019/04/09
O+ band EMIC waves  ring distributions  linear wave growth  
GIS-based approach applied to optimizing recommendations of Eucalyptus genotypes 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2017, 392
作者:  Marcatti, Gustavo E.;  Resende, Rafael T.;  Resende, Marcos Deon V.;  Ribeiro, Carlos Antonio A. S.;  dos Santos, Alexandre R.;  da Cruz, Jovane P.;  Leite, Helio G.
收藏  |  浏览/下载:14/0  |  提交时间:2019/04/09
Breeding  Non-linear mixed model  Climatic variables  Growth curve  Reaction norm  Adaptability  Stability  Resilience