TY - JOUR
T1 - Effect of Surface Hydrogenation on the Adsorption and Thermal Evolution of Nitrogen Species on Diamond(001) by Microwave N2 Plasma
AU - Zheng, Yusen
AU - Kuntumalla, Mohan Kumar
AU - Attrash, Mohammed
AU - Hoffman, Alon
AU - Huang, Kai
PY - 2021/12/16
Y1 - 2021/12/16
N2 - We describe the adsorption and thermal evolution of nitrogen species on the hydrogenated diamond(001) surface impacted by microwave N2 plasma, as studied by X-ray photoelectron spectroscopy, temperature-programmed desorption, and density functional theory simulations. The experiment and theory are in accord with the formation of two adsorption states of nitrogen species; that is, a horizontal molecular state, h-N2(ad), spanning over two substrate dimers, and a vertical state, v-N2(ad), centered at one substrate dimer. Upon annealing the as-nitrided substrate up to 1000 °C, we find the loss of surface nitrogen species, as resulted from the h-N2(ad) to v-N2(ad) conversion accompanied by the desorption of v-N2(ad) into gaseous N2. While hydrogenated diamond surfaces are generally inert to chemical modification, our findings demonstrate the role that surface hydrogenation plays in stabilizing nitrogen species adsorbed on diamond(001) by nitrogen plasma.
AB - We describe the adsorption and thermal evolution of nitrogen species on the hydrogenated diamond(001) surface impacted by microwave N2 plasma, as studied by X-ray photoelectron spectroscopy, temperature-programmed desorption, and density functional theory simulations. The experiment and theory are in accord with the formation of two adsorption states of nitrogen species; that is, a horizontal molecular state, h-N2(ad), spanning over two substrate dimers, and a vertical state, v-N2(ad), centered at one substrate dimer. Upon annealing the as-nitrided substrate up to 1000 °C, we find the loss of surface nitrogen species, as resulted from the h-N2(ad) to v-N2(ad) conversion accompanied by the desorption of v-N2(ad) into gaseous N2. While hydrogenated diamond surfaces are generally inert to chemical modification, our findings demonstrate the role that surface hydrogenation plays in stabilizing nitrogen species adsorbed on diamond(001) by nitrogen plasma.
U2 - 10.1021/acs.jpcc.1c09514
DO - 10.1021/acs.jpcc.1c09514
M3 - 文章
SN - 1932-7447
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
ER -