Influence of Structural Dynamics on the Kinetics of Atomic Hydrogen Reactivity with Low-Temperature Alkanethiolate Self-Assembled Monolayers
Influence of Structural Dynamics on the Kinetics of Atomic Hydrogen Reactivity with Low-Temperature Alkanethiolate Self-Assembled Monolayers
复制标题
结构动力学对低温链烷硫醇自组装单层原子氢反应动力学的影响
DOI:
10.1021/acs.jpcc.1c07487
复制
发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Sibener, S. J.
中科院分区:
文献类型:
--
作者:
Brown, Sarah;Sayler, Jeffrey D.;Sibener, S. J.
This study examines the impact of surface temperature on alkanethiolate self-assembled monolayer (SAM) reactivity with atomic hydrogen (H) as well as how the combined effects of temperature and alkanethiol chain length alter the reaction outcome. This is achieved using ultrahigh vacuum scanning tunneling microscopy (UHV-STM) to monitor the spatiotemporal evolution of the monolayer throughout the reaction. We find that with decreasing temperature, the reaction rate of alkanethiol SAMs with atomic H decreases monotonically. Furthermore, the kinetic profile of the low-temperature reaction differs from that at room temperature, indicating structural and dynamical fluctuations within the monolayer that influence reactivity. Chain length is also seen to significantly affect reactivity at reduced substrate temperature, with longer alkanethiols reacting more slowly than shorter ones. Finally, we observe a unique surface rearrangement of the SAM upon exposure to atomic H, including changes in the organization of close-packed thiol domains and the evolution of gold adatom islands not observed at elevated temperatures. Overall, this work provides both quantitative and nanoscopic insight into how substrate temperature influences the structural dynamics of thiolate monolayers and how these fluctuations influence chemical reactivity.
登录
查看更多内容
DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
G. N. Robinson;A. Freedman;R. Graham
通讯作者:
R. Graham
影响因子:
3.9
作者:
Poirier, GE;Fitts, WP;White, JM
通讯作者:
White, JM
影响因子:
3.7
作者:
J. Gorham;Billy Smith;D. Fairbrother
通讯作者:
D. Fairbrother
DOI:
10.1021/acs.jpcc.9b10914
发表时间:
2020
期刊:
The Journal of Physical Chemistry C
影响因子:
--
作者:
Turner, David A.;Schalk, Catlin N.;Kandel, S. Alex
通讯作者:
Kandel, S. Alex
DOI:
10.1021/acs.jpcc.9b06809
发表时间:
2019
期刊:
The Journal of Physical Chemistry C
影响因子:
--
作者:
Sayler, Jeffrey D.;Brown, Sarah;Sibener, S. J.
通讯作者:
Sibener, S. J.