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In situ TEM Investigations of Nanomaterials

E-Beam and 2D Nanomaterials

Monitor and track structure / spectroscopic degradation of 2D materials

  • E-beam-driven growth and degradation of novel 2D materials
  • E-beam/matter interactions
  • Structural and Spectroscopic analysis

Current publiaction: R. G. Mendes et al. ACS Nano 13 (2019) 978

E-Beam Interactions on 2D Nanomaterials

E-Beam Interaction with MXenes

Results published in R. G. Mendes et al. Small. 16 (2020) 1907115 (1-9)

Acceleration Voltage and Current Influence on g-C3N4

  • Structural changes under acceleration voltages and currents exposures
  • EELS analysis to determine local chemical composition changes
  • electron sensitive

► Towards imaging and analysis of  electron-sensitive materials

  • Understanding processes of electron beam interaction for in situ TEM growth 2D materials in graphene pores
  • Growth of novel materials
  • Interaction of e-beam with 2D materials and spectroscopic analysis

► Towards controllable e-beam nano-manipulation and e-beam engineering

Controllable In situ Graphitization

E-Beam-Driven Graphene Formation on Iron Oxide Nanoparticles

  • Electron-driven graphitization of organic molecules (oleic acid) on iron oxide NPs
  • Easily controllable graphene coating thickness
  •  Scalable and environmental friendly

Results published in R. G. Mendes et al. J. Phys. Chem. C 116 (2012) 23749

 

E-Beam Imaging of Soft Matter (Cells)

Iron Oxide NPs Tracking, Uptake and Cytotoxicity

  • Biological sample preparation for TEM studies
  • Tracking of iron oxide NPs inside cells
  • NPs with larger diameter and larger cluster are preferentially internalized by the cells

Results published in R. G. Mendes et al. BBA 1840 (2014) 160

NGO NPs Tracking, Uptake and Cytotoxicity

  • NGO flakes with different morphologies are internalized at different rates
  • NGO induces cell differentiation

Results published in:
R. G. Mendes et al. J. Mater. Chem. 3 (2015) 2522

R. G. Mendes et al. Nano Res. 10 (2017) 1980