Multi-channel ZnO Nanoconductors with Tunable Optoelectrical Properties

摘要

A new doping technology for controlled growth has been developed recently. Successful doping of ZnO nanomaterials is still a challenge even today due to the vapor pressure difference by orders of magnitudes between dopants and Zn and literature reports of successful doping are scarce. The alloying evaporation deposition (AED) method was used to synthesize Al doped ZnO nanowires with various doping concentrations. Several types of single- crystalline Zn and Zn/ZnO core-shell polyhedrons were synthesized step by step by CVD followed by designed oxidizing treatments. Direct evidences of apparent deformation of polyhedrons after stress relief were provided to prove the lattice mismatch effect. Room-temperature CL measurements show the polyhedrons exhibit tunable UV and green emissions with different oxidation conditions, which were attributed to surface and strain effects. The Zn/ZnO polyhedrons are promising for opto-electronic nanodevice applications.