Controlling the radical-induced redox chemistry inside a liquid-cell TEM

Chemical Science
Bojan AmbrožičSašo Šturm

Abstract

With Liquid-Cell Transmission Electron Microscopy (LCTEM) we can observe the kinetic processes taking place in nanoscale materials that are in a solvated environment. However, the beam-driven solvent radiolysis, which results from the microscope's high-energy electron beam, can dramatically influence the dynamics of the system. Recent research suggests that radical-induced redox chemistry can be used to investigate the various redox-driven dynamics for a wide range of functional nanomaterials. In view of this, the interplay between the formation of various highly reactive radiolysis species and the nanomaterials under investigation needs to be quantified in order to formulate new strategies for nanomaterials research. We have developed a comprehensive radiolysis model by using the electron-dose rate, the temperature of the solvent, the H2 and O2 gas saturation concentrations and the pH values as the key variables. These improved kinetic models make it possible to simulate the material's specific radical-induced redox reactions. As in the case of the Au model system, the kinetic models are presented using Temperature/Dose-rate Redox potential (TDR) diagrams, which indicate the equilibrium [Au0]/[Au+] concentration ratios that ar...Continue Reading

References

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Citations

Mar 23, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Tomoya Yamazaki, Yuki Kimura
Apr 22, 2021·Ultramicroscopy·Mei SunQing Chen
Jul 29, 2021·Journal of the American Chemical Society·Ivan A Moreno-HernandezA Paul Alivisatos

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Methods Mentioned

BETA
chips
irradiating
transmission electron microscopy
chip
electron
X-ray

Software Mentioned

MATLAB
LCTEM

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