O2-oxidation of individual graphite and graphene nanoparticles in the 1200–2200 K range: Particle-to-particle variations and the evolution of the reaction rates and optical properties

The kinetics for O2 oxidation of individual graphite and graphene platelet nanoparticles (NPs) were studied as a function of temperature (1200–2200 K) at varying oxygen partial pressures, using a single nanoparticle mass spectrometry method. NP temperature (TNP) was measured by measuring the NP ther...

Full description

Saved in:
Bibliographic Details
Published in:Carbon (New York) 2021-03, Vol.173, p.286-300
Main Authors: Rodriguez, Daniel J., Lau, Chris Y., Long, Bryan A., Tang, Susanna An, Friese, Abigail M., Anderson, Scott L.
Format: Article
Language:English
Subjects:
Absorption cross sections
Emission analysis
Emission spectra
Evolution
Graphene
Graphite
Kinetics
Laser beam heating
Mass spectrometry
Nanoparticle
Nanoparticles
Optical properties
Oxidation
Reaction kinetics
Single particle
Surface structure
Thermal emission
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The kinetics for O2 oxidation of individual graphite and graphene platelet nanoparticles (NPs) were studied as a function of temperature (1200–2200 K) at varying oxygen partial pressures, using a single nanoparticle mass spectrometry method. NP temperature (TNP) was measured by measuring the NP thermal emission spectra during the kinetics studies. The initial oxidation efficiency is found to peak in the 1200–1500 K range, dropping by an order of magnitude as TNP was increased above 2000 K. There were large NP-to-NP variations in the oxidation rates, attributed to variations in the NP surface structure. In addition, the oxidation efficiencies evolved, non-monotonically, as the NPs reacted, decreasing by factors of between 10 and 300. This evolution of reactivity is attributed to changes in the NP surface structure due to the combination of oxidation and annealing. The optical properties, including wavelength dependence of the emissivity and the absorption cross section for the 532 nm heating laser, also tended to evolve as the NPs oxidized, but differently for each individual NP, presumably reflecting differences in the initial structures and their evolution. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2020.10.053