Secondary electron emission patterning of diamond with hydrogen and oxygen plasmas

Park, Minseo; Choi, Wonbong; Streiffer, S. K.; Hren, J. J.; Cuomo, J. J.

doi:10.1063/1.121424

Cited by 9 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One advantage of photochemical functionalization is the potential ability to directly pattern different chemical functional groups onto the surface, using the UV light to control the photochemical reactions. Previous studies have used masks to pattern oxygen and hydrogen on diamond using plasmas , and lithographic methods to organically pattern diamond surfaces, but direct photochemical patterning of molecular species has not been previously achieved. To pattern the samples, we used physical masks constructed from thin molybdenum sheets that were placed in direct contact with the TFAAD fluid and then covered with a UV-transparent quartz disk to prevent drying, as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Electrical Bias Dependent Photochemical Functionalization of Diamond Surfaces

et al. 2006

View full text Add to dashboard Cite

Diamond is an excellent substrate for many sensing and electronic applications because of its outstanding stability in biological and aqueous environments. When the diamond surface is H-terminated, it can be covalently modified with organic alkenes using wet photochemical methods that are surface-mediated and initiated by the ejection of electrons from the diamond. To develop a better understanding of the photochemical reaction mechanism, we examine the effect of applying an electrical bias to the diamond samples during the photochemical reaction. Applying a 1 V potential between two diamond electrodes significantly increases the rate of functionalization of the negative electrode. Cyclic voltammetry and electrochemical impedance measurements show that the 1 V potential induces strong downward band-bending within the diamond film of the negative electrode. At higher voltages a Faradaic current is observed, with no further acceleration of the functionalization rate. We attribute the bias-dependent changes in rate to a field effect, in which the applied potential induces a strong downward band-bending on the negative electrode and facilitates the ejection of electrons into the adjacent fluid of reactant organic alkenes. We also demonstrate the ability to directly photopattern the surface with reactant molecules on length scales of <25 microm, the smallest we have measured, using simple photomasking techniques.

show abstract

Section: Resultsmentioning

confidence: 99%

Electrical Bias Dependent Photochemical Functionalization of Diamond Surfaces

et al. 2006

View full text Add to dashboard Cite

show abstract

“…One might expect that termination with H atoms for truncated C atoms would change the electron density of the neighbouring C atoms. However, the electronegativities of C and H atoms are 2.55 and 2.20 [21], respectively, and the B3LYP/6-311++G(2d, p) bond energies of the sp 3 -sp 3 C-C bond and the sp 3 -s C-H bond are 84 and 87 kcal mol −1 , respectively. Therefore, we expect that hydrogen termination of the cluster will have little effect on the energetics of reactions on the dimer.…”

Section: Computational Detailsmentioning

confidence: 98%

The effect of an electric field on the chemical vapour deposition of (100) diamond

Kang¹,

Musgrave²

2001

Nanotechnology

View full text Add to dashboard Cite

The scanning tunnelling microscope (STM) has been used to modify surfaces with atomic resolution and has consequently been proposed as a tool for nanotechnology. Here we examine a process for deposition of (100) diamond under a localized electric field. We use ab initio quantum-chemistry techniques to investigate the effect of an electric field on the chemical vapour deposition of (100) diamond. The field approximates the field of an STM by using a point charge placed 15 Å above the surface to create a 0.64 V Å-1 field at the dimer. Our study explores the effect of this electric field on CH3 adsorption, and the dimer-opening and ring-closing steps of the Brenner-Garrison diamond CVD mechanism. CH3 adsorption is exothermic by 84 kcal mol-1 and is not affected by the electric field. The dimer-opening and ring-closing steps are sensitive to the applied field: the dimer-opening barrier is reduced from 9.6 to 6.0 kcal mol-1, while the barrier of the ring-closing step is reduced from 13.6 to 11.0 kcal mol-1. Our results indicate that the rate of CVD diamond growth can be enhanced by the application of an electric field, in agreement with experiment.

show abstract

Low energy electron trapping in hydrogenated diamond surfaces by resonance electron attachment

Hoffman

Akhvlediani

2005

Diamond and Related Materials

View full text Add to dashboard Cite

Secondary electron emission patterning of diamond with hydrogen and oxygen plasmas

Abstract: Decay of secondary electron emission and charging of hydrogenated and hydrogen-free diamond film surfaces induced by low energy electrons

Cited by 9 publications

References 12 publications

Electrical Bias Dependent Photochemical Functionalization of Diamond Surfaces

Electrical Bias Dependent Photochemical Functionalization of Diamond Surfaces

The effect of an electric field on the chemical vapour deposition of (100) diamond

Low energy electron trapping in hydrogenated diamond surfaces by resonance electron attachment

Contact Info

Product

Resources

About