Journal of Chemical Physics p. 6774 - 6783 (1992)
Update date:2022-08-17
Topics:
Land, T. A.
Michely, T.
Behm, R. J.
Hemminger, J. C.
Comsa, G.
We have used variable temperature, ultrahigh vacuum scanning tunneling microscopy (STM), in both static and time-dependent experiments, to study the chemistry of the ethylene/Pt(111) system.Images of ethylene which exhibit long-range order have been obtained at a sample temperature of 160 K.The conversion of ethylene to ethylidyne has been observed directly in STM images.This conversion reaction is observed to occur in a "patchy" manner across the surface at saturation coverage.As the reaction proceeds, well-defined islands of unreacted ethylene continue to be clearly observed.Further dehydrogenation of the ethylidyne formed from ethylene leads to carbon containing particles dispersed radomly across the sample.After annealing the ethylidyne covered sample to 500 K, the surface is uniformly covered with carbon containing particles which exhibit a bimodal distribution of heights (one and two atomic layers) consisting of an average of ten and twenty carbon atoms, respectively.Further anealing to 700 K results in the formation of larger particles which appear to be a single atomic layer high and 10-15 Angstroem in diameter in the STM images.These particles contain an average of thirty-four carbon atoms.Pt steps do not show any preferential reactivity for these reactions.Annealing the carbon particle covered surface to higher temperatures results in the formation of monolayer thick graphite islands, which eventually accumulate at the Pt steps.
View MoreHangzhou Maytime Bio-Tech Co.,Ltd.
website:http://www.maytime.com.cn
Contact:+86-571-88925295 88920965
Address:NO.2-1701 Ganghui Central Ningwei Street, Xiaoshan Hangzhou Zhejiang China
Shandong Bolode Bio-Technology Co., LTD
Contact:+86-0531-58966870
Address:136 Jingyi Road,Huaiyin District,Jinan,Shandong,China
Shaanxi King Stone Enterprise Company Limited
Contact:86-29-88353805,13609285751
Address:.209 Keji Road Hi-Tech industrial Develpment Zone .Xian China
shanghai Tauto Biotech Co., Ltd
website:http://www.tautobiotech.com/en/index.htm
Contact:+86-21-51320588 ext. 8025
Address:No. 326, Aidisheng Rd , Zhangjiang Hi-tech Park, Shanghai , P.R.CHINA
SHANGHAI SYSTEAM BIOCHEM CO., LTD
website:http://www.systeambc.com
Contact:86-021-58380978
Address:Building 87,Lane 669, Dong Jing Road Shanghai,P.R.China
Doi:10.1021/jo00406a002
(1978)Doi:10.1021/jo990205u
(1999)Doi:10.1016/j.jcat.2015.01.003
(2015)Doi:10.1039/a705713j
(1997)Doi:10.1016/j.jfluchem.2021.109881
(2021)Doi:10.1039/f19827803089
(1982)