M. Beaudoin, H.J. Kim and J. Wang
Advanced Nanofabrication Facility, AMPEL, University of British Columbia
2355 East Mall, Vancouver, BC V6T 1Z4
A, Ahktari-Zavareh and K. L. Kavanagh
Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6
InSb nanowires (NW) have been synthesized by pulsed electrodeposition using anodic alumina membranes (AAM) as templates. Two sets of AAMs were used: one set had 150 nm diameter pores and a porosity of 32% with a density of 2×109 pores/cm2 while the other set had 35 nm pores and 12% porosity with a density of 1010 pores/cm2. Both sets of membranes were 50 µm thick. The InSb AAMs were dissolved with a drop of NaOH and rinsed several times in deionized (DI) water and then dispersed in solution in an ultrasonic bath. The NWs were deposited on a native Si wafer with an eyedropper and dried on a hotplate at 120°C. Scanning electron microscopy (SEM) imaging shows that the free standing nanowires had uniform diameters but varied in length although they were all several µm long. Powder X-Ray Diffraction (XRD) shows that the 150 nm diameter nanowires exhibit polycrystalline properties with the <111> and <220> being slightly more prominent than the <331>, <422> and even <333> peaks and also showed the presence of an In metallic phase. However, Transmission Electron Microscopy (TEM) measurements performed on both sets of wires shows that the 35 nm diameter wires are amorphous while the 150 nm diameter wires may have some polycrystalline domains. Current efforts are aimed at improving NW crystallinity and harvesting method.
Figure: TEM and SAD image of InSb nanowire.
Undergraduate theses from the same theme:
Figure: Gold contacts to InSb nanowires defined by electron beam lithography.