Chemical deposition of nano-sized electrochromic thin films of Na0.33V2O5 ∙ H2O xerogels

Stojkovikj, Sasho and Koleva, Violeta and Najdoski, Metodija (2014) Chemical deposition of nano-sized electrochromic thin films of Na0.33V2O5 ∙ H2O xerogels. Nanoscience & Nanotechnology: Nanostructured materials application and innovation transfer, 14. pp. 67-69. ISSN 1313-8995

Text Nanoscience and Nanotechnology, 14, 67–69 (2014). .pdf Download (3MB)

Abstract

Electrochromic sodium intercalated vanadium(V) oxide xerogels thin films with composition Na0.33V2O5∙H2O have been deposited on electroconductive FTO glass substrates by a simple chemical bath method. The deposition of the homogenous thin films is performed from an aqueous solution containing sodium metavanadate and diethyl sulfate at 85 °C. The xerogel formation is based on the acidification of the metavanadate solution as a result of the hydrolysis of (C2H5)2SO4. Thin films with thickness of about 50 and 110 nm have been prepared for deposition times of 5 and 10 min, respectively. The composition, structure and morphology of the films are studied by XRD, TG and SEM. The film morphology is characterized by nano-particles with sizes between 80 and 100 nm that tightly stick to each other forming elongated ribbon-like units. The electrochemical and electrochromic properties have been studied in two non-aqueous electrolytes: LiClO4/propylene carbonate and LiCl/methanol. The cyclic voltammograms in LiClO4/propylene carbonate display two stable redox pairs related to the transitions between V(V) and V(IV) sites which give rise to colour changes: yellow/green/blue. The Na0.33V2O5∙H2O thin films exhibit high electrochromic activity with transmittance variance of 42 % at 900 nm and this is a promising result for potential application in electrochromic devices.

Keywords: electrochromism; nanomaterials; thin films; vanadium(V) oxide; xerogels

Item Type:	Article
Additional Information:	Proceedings of the 15th Workshop Nanostructured Materials Application and Innovation Transfer, November 21-23, 2013, Sofia, Bulgaria
Subjects:	Natural sciences > Chemical sciences Engineering and Technology > Materials engineering Engineering and Technology > Nano-technology
Divisions:	Faculty of Technology
Depositing User:	Saso Stojkovik
Date Deposited:	01 Mar 2024 09:21
Last Modified:	01 Mar 2024 09:21
URI:	https://eprints.ugd.edu.mk/id/eprint/33793

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