Effect of Surface Hydrogenation on the Adsorption and Thermal Evolution of Nitrogen Species on Diamond(001) by Microwave N2 Plasma

Yusen Zheng, Mohan Kumar Kuntumalla, Mohammed Attrash, Alon Hoffman*, Kai Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.
Original languageEnglish
JournalJournal of Physical Chemistry C
DOIs
StatePublished - 16 Dec 2021

Fingerprint

Dive into the research topics of 'Effect of Surface Hydrogenation on the Adsorption and Thermal Evolution of Nitrogen Species on Diamond(001) by Microwave N2 Plasma'. Together they form a unique fingerprint.

Cite this