Beauty of science: isolated core-shell silver/gold nanowire

18-04-2013

The image shows the coherent X-ray diffraction pattern of an isolated, single-crystalline core-shell Ag/Au nanowire measured in Bragg condition at the ID03 beamline.

  • Share

Characterisation of nano-objects is a technological challenge, in particular for atomic level details of their interfacial structures, spatial elemental distribution and strain gradients. Recent studies within a collaboration between IM2NP-CNRS, MPI Stuttgart, CEA-Grenoble and ID03/ESRF have demonstrated that anomalous coherent X-ray diffraction imaging is a promising and attractive method to map the shape, concentration and deformation fields simultaneously inside coherent and coherently diffracting nanostructures. The technique even permits in situ experiments owing to its non-destructive nature. During an in situ annealing experiment core-shell morphology was preserved in Ag/Au nanowire at temperatures that are reported to lead to significant intermixing by volume diffusion in bulk material. Under these conditions, the rate of intermixing in the nanowire was lower than expected for bulk diffusion. [S. Haag et al., Phys. Rev. B 87, 035408 (2013); S. Haag et al., NanoLetters accepted (2013).]

Top image: Coherent X-ray diffraction pattern of an isolated, single-crystalline core-shell Ag/Au nanowire (Credit: M.-I. Richard, ID01/ESRF, Aix-Marseille Universit√©, IM2NP-CNRS).