Vertically oriented germanium nanowires grown from gold colloids on silicon substrates and subsequent gold removal.
A linker-free method to deposit citrate-stabilized Au colloids onto hydrogen-terminated Si by acidifying the Au colloid solution with HF or HCl is presented. This method prevents oxide formation and provides a model system for studying orientation control of nanowires by epitaxy. Conditions are reported that result in vertically oriented Ge nanowires of uniform diameter and length on Si(111). We then present a method to remove Au catalysts from the nanowires with aqueous triiodide and HCl.
Woodruff
Jacob H
JH
Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
Ratchford
Joshua B
JB
Goldthorpe
Irene A
IA
McIntyre
Paul C
PC
Chidsey
Christopher E D
CE
D003460:Crystallization / Q000379:methods*; D005857:Germanium / Q000737:chemistry*; D006046:Gold / Q000302:isolation & purification; D017979:Gold Colloid / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
D017979:Gold Colloid; D046911:Macromolecular Substances; D005857:Germanium; D006046:Gold; D012825:Silicon