Impact of Electron-Beam Heating during 3DNanoprinting

E. Mutunga, Robert Winkler, Jürgen Sattelkow, P. Rack, Harald Plank, Jason D. Fowlkes

Research output: Contribution to journalArticleResearchpeer-review

Abstract

An artifact limiting the reproduction of three-dimensional (3D) designs using nanoprinting has been quantified. Beam-induced heating was determined through complementary experiments, models, and simulations to affect the deposition rate during the 3D nanoprinting of mesh objects using focused electron beam induced deposition (FEBID). The mesh objects are constructed using interconnected nanowires. During nanowire growth, the beam interaction driving deposition also causes local heating. The temperature at the beam impact region progressively rises as thermal resistance increases with nanowire growth. Heat dissipation resembles the classical mode of heat transfer from extended surfaces; heat must flow through the mesh object to reach the substrate sink. Simulations reveal that beam heating causes an increase in the rate of precursor desorption at the BIR, causing a concomitant decrease in the deposition rate, overwhelming an increase in the deposition rate driven by thermally enhanced precursor surface diffusion. Temperature changes as small as 10 K produce noticeable changes in deposit geometry; nanowires appear to deflect and curve toward the substrate because the vertical growth rate decreases. The 3D FEBID naturally ensues from the substrate surface upward, inducing a vertical temperature gradient along the deposit. Simulations, experiments, temperature-controlled studies, and process current monitoring all confirm the cause of nanowire distortion as beam-induced heating while also revealing the rate-determining physics governing the final deposit shape.

LanguageEnglish
Pages5198-5213
Number of pages16
JournalACS Nano
Volume13
Issue number5
Early online date2019
DOIs
StatusPublished - 2019

Fingerprint

Nanowires
Electron beams
electron beams
nanowires
Heating
Deposition rates
heating
Deposits
mesh
deposits
Substrates
causes
Heat transfer
Surface diffusion
beam interactions
Heat losses
Heat resistance
simulation
Thermal gradients
Temperature

Keywords

  • 3D nanoprinting
  • beam-induced heating
  • direct-write
  • focused electron beam induced deposition
  • nanofabrication

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Application

Cite this

Impact of Electron-Beam Heating during 3DNanoprinting. / Mutunga, E.; Winkler, Robert; Sattelkow, Jürgen; Rack, P.; Plank, Harald; Fowlkes, Jason D.

In: ACS Nano, Vol. 13, No. 5, 2019, p. 5198-5213.

Research output: Contribution to journalArticleResearchpeer-review

Mutunga, E. ; Winkler, Robert ; Sattelkow, Jürgen ; Rack, P. ; Plank, Harald ; Fowlkes, Jason D. / Impact of Electron-Beam Heating during 3DNanoprinting. In: ACS Nano. 2019 ; Vol. 13, No. 5. pp. 5198-5213.
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