Atmospheric pressure chemical vapor deposition of amorphous tungsten doped vanadium dioxide for smar

Atmospheric Pressure Chemical Vapor Deposition Of Amorphous Tungsten Doped Vanadium Dioxide For smart Window Applications

Dimitrios Louloudakis^{1, 2*}, Dimitra Vernardou¹, Emmanuel Spanakis³, Mirela Suchea⁴, George Kenanakis⁵, Martyn Pemble⁶, Konstantinos Savvakis^{1, 7}, Nikolaos Katsarakis^{1, 4, 5}, Emmanuel Koudoumas^{1, 4}, George Kiriakidis^{2, 5}

¹Center of Materials Technology & Photonics, School of Applied Technology, Technological Educational Institute of Crete, Heraklion 71004, Crete, Greece

²Department of Physics, University of Crete, Heraklion 71100, Crete, Greece

³Department of Materials Science & Technology, University of Crete, Heraklion 71100, Crete, Greece

⁴Department of Electrical Engineering, School of Applied Technology, Technological Educational Institute of Crete,Heraklion 71004, Crete, Greece

⁵Institute of Electronic Structure & Laser, Foundation for Research & Technology- Hellas, P.O. Box 1527, Vassilika Vouton, Heraklion 71110, Crete, Greece

⁶Tyndall National Institute, University College Cork, Lee Maltings, Prospect Row, Cork, Ireland

⁷Mechanical Engineering Department, School of Applied Technology,Technological Educational Institute of Crete, Heraklion 71004, Crete, Greece

Adv. Mater. Lett., 2016, 7 (3), pp 192-196

DOI: 10.5185/amlett.2016.6024

Publication Date (Web): Feb 01, 2016

E-mail: dimitr17@yahoo.gr

Full Article

Abstract

Amorphous tungsten doped vanadium dioxide coatings were grown on SnO₂-precoated glass substrates using the atmospheric pressure chemical vapor deposition of vanadium (V) triisopropoxide and tungsten (VI) isopropoxide at 450 ^oC without an oxygen source. The effect of N₂ flow rate through the tungsten’s precursor bubbler was examined keeping the respective flow rate through the vanadium’s precursor bubbler at 4 L min^-1 for a growth period of 30 min. They were characterized by x-ray diffraction, Raman and x-ray photoelectron spectroscopy, field-emission scanning electron microscopy and UV-vis/IR transmittance. The samples grown using 0.4 L min^-1 N₂ flow rate through the tungsten precursor’s bubbler, showed the greatest reduction in transition temperature from 65.5 in granular VO₂ to 44 ^oC in worm-like V_0.985W_0.015O₂ structures approaching that required for commercial use as a smart window coating.