In recent years, graphene has been explored as a heating membrane for studying high-temperature dynamics inside the transmission electron microscope (TEM) due to several limitations with the existing silicon nitride-based membrane. However, the transfer of monolayer graphene films for TEM experiments is challenging and requires many complicated steps with a minimum success rate. This work developed a novel in situ heating platform by combining the graphene oxide (GO) flakes in the pre-patterned chips. The isolated GO flake was self-suspended between the metal electrodes by a simple drop-casting process. The GO was reduced and characterized using Raman and electron energy-loss spectroscopy. Furthermore, a GO-based heater was used to investigate the thermal stability of gold and silica nanoparticles. The gold nanoparticles evaporated non-uniformly and left an empty carbon shell, while silica disappeared uniformly by etching carbon support. We successfully demonstrated a GO flake as a heating membrane to study high temperature thermal dynamic reactions: melting/evaporation, agglomeration, Rayleigh instability, and formation/or removal of carbon in the nanoparticles.
Bibliographical noteFunding Information:
NMB and DM thank KAUST for graduate scholarships. This project was supported by KAUST (BAS/1/1346-01-01). We thank the FCT, Portugal, for sponsoring the project CASOLEM, POCI-01-0145-FEDER-028917. We acknowledge the technical support provided by Dalaver and other scientists from the Imaging and Characterization Core Labs at KAUST.
© 2022 The Author(s). Published by IOP Publishing Ltd.
- carbon shell
- gold nanoparticle
- graphene etching
- graphene heater
- in situ electron microscopy
- silica nanoparticle
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering