Probing liquid behaviour by helium atom scattering: surface structure and phase transitions of an ionic liquid on Au(111)
Probing liquid behaviour by helium atom scattering: surface structure and phase transitions of an ionic liquid on Au(111)
复制标题
通过氦原子散射探测液体行为:Au(111) 上离子液体的表面结构和相变
DOI:
10.1039/c3sc52237g
复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
McIntosh E
中科院分区:
文献类型:
--
作者:
McIntosh E
We demonstrate the application of the helium atom scattering technique to ionic liquid surfaces, specifically to study structure and phase transitions in layers of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C2C1Im][Tf2N] adsorbed onto the (111) surface of single crystal gold (Au) in UHV. We observe the formation of successive ordered layers of ion pairs during adsorption of [C2C1Im][Tf2N] and find that a dose equivalent to three layers of ion pairs is needed to wet the surface. The presence and position of the elastic diffraction peaks in helium diffraction scans indicates that there is registry between the surface layer of even thick adsorbed films (>8 layers or ∼36 Å) of [C2C1Im][Tf2N] and the Au(111) substrate, with the [C2C1Im][Tf2N] structure described by the matrix notation (3 2, −6 8). For substrate temperatures between 150 and 320 K, the intensity of specularly reflected helium and the diffraction peaks reveal a phase transition from a crystalline phase to a liquid, with melting occurring between 270 and 280 K, higher than in the bulk. We find no significant difference between scattering from the solid and liquid surfaces, and find a Debye–Waller factor for this system 2W ∼ 1.
登录
查看更多内容
影响因子:
8.6
作者:
E. M. McIntosh;P. R. Kole;M. El;David Chisnall;J. Ellis;W. Allison
通讯作者:
W. Allison
DOI:
10.1021/jp807924g
发表时间:
2009-01
期刊:
The journal of physical chemistry. B
影响因子:
--
作者:
Cherry S. Santos;S. Baldelli
通讯作者:
Cherry S. Santos;S. Baldelli
DOI:
--
发表时间:
1993
期刊:
Physical Review B (Condensed Matter)
影响因子:
--
作者:
Manson;Skofronick
通讯作者:
Skofronick
影响因子:
8.6
作者:
Ellis;Hermann;Hofmann;Toennies
通讯作者:
Toennies
DOI:
--
发表时间:
1971
期刊:
影响因子:
--
作者:
J. Beeby;L. Dobrzyński
通讯作者:
L. Dobrzyński