Fig. 3

a 2.0 nm Au film at room temperature. b The gold film by RTA at 550 °C in 100 °C/s. c The gold film was ramped up to the 550 °C in 0.1 °C/s. d TEM image of an as-synthesized individual α-In₂Se₃ nanowire, with an Au nanoparticle tip. SAED pattern of the α-In₂Se₃ nanowires (inset). e The corresponding HRTEM image of d shows the growth direction of the nanowire is along the [001]. f and g are the EDS spectra of the selected α-In₂Se₃ nanowire taken from the body part and the tip part, respectively