Effect of the N-2/O-2 ratio on the morphology of SnO2 crystals synthesized through the thermal evaporation of Sn

摘要

SnO2 crystals were synthesized on sapphire substrate through the thermal evaporation of Sn powder in an oxygen and nitrogen gas environment at 1000 degrees C. No catalysts were used for the formation of the SnO2 crystals. One-dimensional structures such as wires and belts were formed in an N-2 environment. With increasing the ratio of O-2 to N-2 in an ambient gas, the morphology of the SnO2 crystals changed from wire and belt to particle. This provides an evidence that the ratio of N-2/O-2 in the ambient gas is critical to the change in the morphology of SnO2 crystals. The X-ray diffraction analysis indicated that all the SnO2 crystals had a ruffle tetragonal crystal structure. The cathodoluminescence spectra of the SnO2 crystals showed that N-2/O-2 ratio in the ambient gas had an influence on the emission properties. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.