Fig. 1.

a Illustration of a two-zone quartz-tube furnace. The In₂Se₃ powder was used as a precursor and placed upstream in the middle of the tube at 800 °C, and SiO₂/Si(100) coated with a 2.0 nm thick Au film was placed downstream and the argon gas as the carrier gas. b and c are the SEM images of In₂Se₃ nanowires which were grown on the substrate with and without the RTA process, respectively. d A typical XRD spectrum of the Au-catalyzed α-In₂Se₃ NWs. The lattice constants are a = 4.025 Å and c = 19.235 Å (JCPDS card, No. 34–1279)