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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Oxygenation of Diamond Surfaces via Hummer's Method

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Author(s):
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Puthirath, Anand B. [1] ; Oliveira, Eliezer F. [2, 3] ; Gao, Guanhui [1] ; Chakingal, Nithya [1] ; Kannan, Harikishan [1] ; Li, Chenxi [1] ; Zhang, Xiang [1] ; Biswas, Abhijit [1] ; Neupane, Mahesh R. [4] ; Pate, Bradford B. [5] ; Ruzmetov, Dmitry A. [4] ; Birdwell, A. Glen [4] ; Ivanov, Tony G. [4] ; Galvao, Douglas S. [2, 3] ; Vajtai, Robert [1] ; Ajayan, Pulickel M. [1]
Total Authors: 16
Affiliation:
[1] Rice Univ, Dept Mat Sci & NanoEngn, Houston, TX 77005 - USA
[2] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys, Grp Organ Solids & New Mat, BR-13083970 Campinas, SP - Brazil
[3] Univ Campinas UNICAMP, Ctr Computat Engn & Sci CCES, BR-13083970 Campinas, SP - Brazil
[4] CCDC US Army Res Lab, RF & Digital Technol, Adelphi, MD 20783 - USA
[5] Naval Res Lab, Chem Div, Washington, DC 20375 - USA
Total Affiliations: 5
Document type: Journal article
Source: CHEMISTRY OF MATERIALS; v. 33, n. 13, p. 4977-4987, JUL 13 2021.
Web of Science Citations: 0
Abstract

Oxygen bonded with diamond surfaces impacts important properties such as electrical conductivity, Schottky barrier height, field emission, and chemical reactivity. Though processes such as thermal, hydrogen plasma, etc., are efficient in oxidizing the hydrogen-terminated diamond surfaces, the oxidation of pristine diamond surfaces through wet chemical treatments is still in its infancy. Herein, we investigated the efficacy of Hummer's method, one of the most celebrated chemical oxidation procedures to convert graphite to graphene oxide, to oxidize the pristine diamond surfaces. We attempted to oxidize both microcrystalline diamond powders and polycrystalline diamond wafers. Due to the presence of an acidic oxidative environment and the formation of strong oxidizing agents such as Mn2O7 and MnO3+ during the course of the reaction, Hummer's method is found to be very effective in oxidizing the pristine diamond surfaces. The degree of oxygen termination is validated through various spectroscopic and surface probe measurements. Microcrystalline diamond powder is more prone to oxidation to polycrystalline diamond wafers due to excess surface area, and many facets with different dangling bond densities are exposed to the oxidizing medium. The experimental observations are endorsed through molecular dynamics simulations. (AU)

FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
Grantee:Munir Salomao Skaf
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 19/07157-9 - DESIGNING NEW 3D STRUCTURES FROM ZEOLITE TEMPLATES FOR 3D PRINTING APPLICATIONS
Grantee:Eliezer Fernando de Oliveira
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 16/18499-0 - Investigation on the structural, mechanical and functional properties of carbon-based nanostructures
Grantee:Eliezer Fernando de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral