FeWO4/FeS core/shell nanorods fabricated by thermal evaporation

FeWO4/FeS core/shell nanorods were fabricated on silicon substrate sputtered with approximately 5 nm of iron thin film via simple thermal evaporation of WO3 and S powders at 1000 degrees C in a tube furnace. The as-prepared nanorods are of uniform morphology in large scale with a diameter of 175 +/- 60 nm and a length of 1.4 +/- 0.5 pm. Both the core and shell are of well-crystalline structure. Raman spectroscopy revealed that the active optical phonon modes positioned at 873, 820, 690, 322 and 300 cm(-1) were assigned to FeWO4, and that at 214 cm(-1) to FeS. The growth mechanism of the nanorods was also proposed. (C) 2014 Elsevier B.V. All rights reserved.