What [plasma used for growing] diamond can shine like flame?
Michael N R Ashfold1, Edward J D Mahoney, Sohail Mushtaq
1School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK. mike.ashfold@bristol.ac.uk.
Chemical Communications (Cambridge, England)
|August 26, 2017
Summary
Chemical vapour deposition (CVD) is used for industrial diamond synthesis. Recent advances focus on understanding the gas-phase chemistry of microwave-activated methane/hydrogen plasmas, including dopant effects.
Area of Science:
- Materials Science
- Plasma Chemistry
- Chemical Engineering
Background:
- Diamond synthesis via chemical vapour deposition (CVD) is an established industrial process.
- There has been a significant recent increase in commercial interest and investment in diamond CVD technology.
Purpose of the Study:
- To survey recent advancements in the understanding of gas-phase chemistry in diamond CVD.
- To investigate the role of dopant species in microwave-activated methane/hydrogen plasmas.
Main Methods:
- Review of recent research on microwave-activated methane/hydrogen plasmas.
- Analysis of gas-phase chemistry involving carbon-containing precursors.
- Examination of the effects of boron, nitrogen, and oxygen dopants.
Main Results:
- Progress in understanding the complex gas-phase reactions during diamond CVD.
- Insights into how dopant species influence plasma chemistry and diamond growth.
- Identification of key chemical pathways in microwave plasma.
Conclusions:
- Significant strides have been made in elucidating the gas-phase chemistry of diamond CVD.
- Dopant incorporation profoundly affects plasma behavior and diamond properties.
- Further research is needed to address remaining challenges in optimizing diamond CVD.
Related Concept Videos
01:19Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
2.0K
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
2.0K
01:02Flame Photometry: Overview
1.6K
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
1.6K
01:16Flame Photometry: Lab
1.0K
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
1.0K