Paper Information

Title: 

SYNTHESIS AND PROPERTIES OF WO3-X THIN FILMS

Type: PAPER
Author(s): NAIMI YAGHOOB,GHASEMI ZOHRE,SADATI SEYED MOSTAFA,AZIMIRAD ROUHOLAH
 
 
 
Name of Seminar: NATIONAL VACUUM CONFERENCE IRAN
Type of Seminar:  CONFERENCE
Sponsor:  PAZHOHESHKADE OLOM VA SANAYE GHAZAEE
Date:  2012Volume 5
 
 
Abstract: 

IN THIS PAPER, SYNTHESIS OF WO3-X THIN FILMS AND THEIR OPTICAL, STRUCTURE AND SURFACE PROPERTIES HAVE STUDIED. FIRST, WO3 THIN FILMS WERE DEPOSITED BY THERMAL EVAPORATION UNDER VACUUM CONDITION ON GLASS SUBSTRATES. THEN, THE DEPOSITED SAMPLES WERE ANNEALED UNDER ATMOSPHERE AT 400OC FOR 1 H. AFTER THIS, THEY WERE REDUCED UNDER PURE HYDROGEN ENVIRONMENT AT 500OC FOR DIFFERENT TIME DURATION OF 0-480 MIN TO PRODUCE WO3-X COMPOSITION. THE SAMPLES WITH DIFFERENT REDUCTION TIME UNDER H2 WERE ANALYZED BY XRD, UV-VISIBLE SPECTROPHOTOMETER AND AFM. XRD SPECTRA SHOWED THAT THE SAMPLES BEFORE THE REDUCTION PROCESS DO NOT HAVE ANY WO3-X STRUCTURE, BUT AFTER THE REDUCTION PROCESS, WO2.8 CRYSTALLINE PHASE WAS FORMED. BY INCREASING THE REDUCTION TIME, THE INTENSITY OF WO2.8 PHASE WAS INCREASED. TRANSMITTANCE AND REFLECTANCE MEASUREMENTS OF THE SAMPLES AT 500 AND 1100 NM WAVELENGTH INDICATED THAT BEFORE THE REDUCTION PROCESS THE SAMPLES WERE TRANSPARENT, WHILE AFTER THE REDUCTION PROCESS THEY BECOME DARK AND THEIR REFLECTANCE WERE INCREASED IN IR REGION.

 
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