Timescale of carbon-shell development

Determine whether progressive carbon-shell formation develops on the timescale of the observed incubation period during which reshaping activity increases in isolated gold nanorods.

Background

The paper proposes that a carbon shell formed from ligand and contamination carbonization under combined electron-beam and laser exposure helps explain the reversible recovery of nanorod shapes. The shell may constrain sublimation, pin residual gold, channel mass transport, and template repeated recovery of a specific metastable morphology.

The authors further suggest that progressive shell formation could explain the internal ratchet responsible for the increasing reshaping activity observed in NR 6. Nevertheless, they do not establish whether shell formation proceeds rapidly enough to account for the incubation behavior shown in Fig. 3c, leaving the relevant timescale unresolved and motivating tests using controlled surface modification, carbon-free supports, varied pulse lengths, and direct temperature measurements.

References

Progressive shell formation is also a plausible origin for the internal ratchet inferred above, increasingly templating the recovered shape; whether it develops on the timescale of the observed incubation (Fig. 3c) remains to be tested.

— Pulse-by-pulse imaging of reversible, collective reshaping in laser-excited gold nanorods  (2610.13383 - Dieperink et al., 9 Oct 2026) in Section “Long-range coupling and reversible disappearance--reappearance cycles”