Structural transformation induced changes in the optical properties of nanocrystalline tungsten oxide thin films
2010; American Institute of Physics; Volume: 96; Issue: 17 Linguagem: Inglês
10.1063/1.3421540
ISSN1520-8842
AutoresSatya Kiran Gullapalli, R.S. Vemuri, C.V. Ramana,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoNanocrystalline tungsten oxide (WO3) films were grown by reactive magnetron sputter-deposition. The structure and optical properties of WO3 films were evaluated using grazing incidence x-ray diffraction and optical spectroscopic measurements. The effect of ultramicrostructure was significant on the optical characteristics of WO3 films. The band gap decreases from 3.25 to 2.92 eV with increasing grain-size from ∼9 to 50 nm while the films exhibit a transition from monoclinic to tetragonal phase. A direct microstructure-property relationship found suggests that tuning properties of WO3 films for desired applications can be achieved by tuning the conditions and controlling the phase.
Referência(s)