Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application

Electrophoretic deposition (EPD) was applied in coating hydrothermally synthesized crystalline tungsten oxide (WO3) nanorods onto ITO glass for electrochromic application. Nanorods suspension of 10 mg/cm3 was used in the EPD with optimum electric field of 5–6 V/cm. Saturation in WO3 deposited amount...

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Main Authors: Khoo, Eugene, Lee, Pooi See, Ma, Jan
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/97080
http://hdl.handle.net/10220/10453
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-970802020-06-01T10:01:57Z Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application Khoo, Eugene Lee, Pooi See Ma, Jan School of Materials Science & Engineering Electrophoretic deposition (EPD) was applied in coating hydrothermally synthesized crystalline tungsten oxide (WO3) nanorods onto ITO glass for electrochromic application. Nanorods suspension of 10 mg/cm3 was used in the EPD with optimum electric field of 5–6 V/cm. Saturation in WO3 deposited amount at electric field >7 V/cm was observed during constant voltage EPD. This could be attributed to the oxide layer shielding effect on the electric field induced electrophoresis. Constant current EPD from 0.2 mA/cm2 to 1.4 mA/cm2 was also performed for the WO3 nanorods. The deposited amount of nanorods was found to be proportional to the current density from 0.2 mA/cm2 to 0.8 mA/cm2 under constant deposition duration. However, the deposited amount decreased at current density >0.8 mA/cm2. This could be due to the high deposition rate that resulted in poor adhesion and hence nanorods peel off during the substrate removal. It was noted that the EPD of nanorods followed a linear relationship in I vs. t−1/2 plot according to Cottrell equation, which implied that the reaction was a diffusion controlled process. The EPD coated substrate was tested in 1 M LiClO4/propylene carbonate (PC) electrolyte for electrochromic studies. The porous WO3 nanorods layer exhibited optical modulation ΔT700 nm of 40%, moderate coloration time tc70% of 28.8 s and improved bleaching time tb70% of 4.5 s, which could be due to the porous oxide layer with large surface area that facilitates the ion insertion/extraction and the electrolyte penetration in the oxide layer shortens the ionic diffusion length of Li. 2013-06-17T06:58:47Z 2019-12-06T19:38:47Z 2013-06-17T06:58:47Z 2019-12-06T19:38:47Z 2009 2009 Journal Article Khoo, E., Lee, P. S., & Ma, J. (2010). Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application. Journal of the European Ceramic Society, 30(5), 1139-1144. 0955-2219 https://hdl.handle.net/10356/97080 http://hdl.handle.net/10220/10453 10.1016/j.jeurceramsoc.2009.05.014 en Journal of the european ceramic society © 2009 Elsevier Ltd.
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description Electrophoretic deposition (EPD) was applied in coating hydrothermally synthesized crystalline tungsten oxide (WO3) nanorods onto ITO glass for electrochromic application. Nanorods suspension of 10 mg/cm3 was used in the EPD with optimum electric field of 5–6 V/cm. Saturation in WO3 deposited amount at electric field >7 V/cm was observed during constant voltage EPD. This could be attributed to the oxide layer shielding effect on the electric field induced electrophoresis. Constant current EPD from 0.2 mA/cm2 to 1.4 mA/cm2 was also performed for the WO3 nanorods. The deposited amount of nanorods was found to be proportional to the current density from 0.2 mA/cm2 to 0.8 mA/cm2 under constant deposition duration. However, the deposited amount decreased at current density >0.8 mA/cm2. This could be due to the high deposition rate that resulted in poor adhesion and hence nanorods peel off during the substrate removal. It was noted that the EPD of nanorods followed a linear relationship in I vs. t−1/2 plot according to Cottrell equation, which implied that the reaction was a diffusion controlled process. The EPD coated substrate was tested in 1 M LiClO4/propylene carbonate (PC) electrolyte for electrochromic studies. The porous WO3 nanorods layer exhibited optical modulation ΔT700 nm of 40%, moderate coloration time tc70% of 28.8 s and improved bleaching time tb70% of 4.5 s, which could be due to the porous oxide layer with large surface area that facilitates the ion insertion/extraction and the electrolyte penetration in the oxide layer shortens the ionic diffusion length of Li.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Khoo, Eugene
Lee, Pooi See
Ma, Jan
format Article
author Khoo, Eugene
Lee, Pooi See
Ma, Jan
spellingShingle Khoo, Eugene
Lee, Pooi See
Ma, Jan
Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application
author_sort Khoo, Eugene
title Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application
title_short Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application
title_full Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application
title_fullStr Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application
title_full_unstemmed Electrophoretic deposition (EPD) of WO3 nanorods for electrochromic application
title_sort electrophoretic deposition (epd) of wo3 nanorods for electrochromic application
publishDate 2013
url https://hdl.handle.net/10356/97080
http://hdl.handle.net/10220/10453
_version_ 1681059734811049984