Clarification of oxygen bonding on diamond surfaces by low energy electron stimulated desorption and high resolution electron energy loss spectroscopy

Abstract

Articles you may be interested inTwo bonding configurations of acetylene on Si ( 001 ) -( 2 × 1 ) : A combined high-resolution electron energy loss spectroscopy and density functional theory study Mechanism of low-energy electron stimulated desorption of O − from hydrogenated and hydrogen-free diamond surfaces exposed to activated oxygen In this work we correlate between O Ϫ electron stimulated desorption ͑ESD͒ from hydrogenated and bare polycrystalline diamond films exposed to thermally activated oxygen for incident electron energies in the 4 -23 eV range and vibrational electron energy losses. By utilizing the previously established mechanism of low energy ESD of O Ϫ from diamond surfaces and high resolution electron energy loss spectroscopy carried out at an incident energy below the threshold for ion desorption, the surface bonding configuration of oxygen is discussed. Such analysis reveals formation of CvO and C-O-C bonds on the bare diamond surface, as well as some adsorbed CO molecules. The bonding configuration of the hydrogenated surface before and after exposure to oxygen is found to be dependent on the hydrogenation method: ex situ microwave plasma versus in situ treatment using a hot tungsten filament for gas activation. Oxygen-related features on the ex situ hydrogenated surface are attributed to formation of CvO and C-O-H bonds, whereas in situ hydrogen treatment retains some bare parts on the film surface where C-O-C bonds can be found alongside CvO and C-O-H.

Oxidation of diamond films by atomic oxygen: High resolution electron energy loss spectroscopy studies

“…This band can be assigned to uCH x deformation vibrations, both saturated and unsaturated, [18][19][20] and stretching vibrations of the C v C dimers. [23][24][25] However, based on a comparison between HREELS peaks and characteristic absorption bands observed by IR spectroscopy, it may be suggested that the 125 meV energy loss is due to peroxide-type vibrations ͑C u O u O u C͒ and the 135 meV peak is most likely due to ether, C u O u C type bonds. 17,18 The spectrum also displays multiple peaks in the 100-135 meV range, which are difficult to assign unambiguously.…”

The Impact of Diamond Grain Size on Hydrogen Concentration, Bonding Configuration, and Electron Emission Properties of Polycrystalline‐Diamond Films

“…[51][52][53][54]57,58,[62][63][64][65][66][67] In order to clarify the origin of the peaks at 300, 450, and 600 meV, an ion irradiation experiment was performed on a well-defined diamond surface. [74,75] Ion irradiation results in partial amorphization of the film surface, so the change in the shape of the spectrum following the ion irradiation may be associated with the change of the surface crystalline structure.…”

Size-dependent surface CO stretching frequency investigations on nanodiamond particles

“…[2][3][4][5][10][11][12][13] Spectroscopic methods such as infrared ͑IR͒ spectroscopy is a useful noninvasive method to characterize the surface structures. The developed surface of diamond particles can contain a large number of surface inorganic groups such as ether ͑-C-O-C͒, peroxide ͑-C-O-O-͒, carbonyl ͑-C v O͒, and hydroxyl-type ͑-C-O-H͒ bonding, as well as hydrocarbon fragments.…”