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- W3208705118 abstract "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." @default.
- W3208705118 created "2021-11-08" @default.
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- W3208705118 date "2021-10-27" @default.
- W3208705118 modified "2023-10-18" @default.
- W3208705118 title "Influence of Structural Dynamics on the Kinetics of Atomic Hydrogen Reactivity with Low-Temperature Alkanethiolate Self-Assembled Monolayers" @default.
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- W3208705118 doi "https://doi.org/10.1021/acs.jpcc.1c07487" @default.
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