標題: Hydrothermal Formation of Tungsten Trioxide Nanowire Networks on Seed-Free Substrates and Their Properties in Electrochromic Device
作者: Hung, Chung Jung
Huang, Yi Hsuan
Chen, Chih Hao
Lin, Pang
Tseng, Tseung Yuen
材料科學與工程學系
電子工程學系及電子研究所
Department of Materials Science and Engineering
Department of Electronics Engineering and Institute of Electronics
關鍵字: Electrochromic device;growth mechanism;nanowire;tungsten trioxide
公開日期: 1-May-2014
摘要: Facile and cost-efficient hydrothermally grown 3-D tungsten trioxide (WO3) nanowires (NWs) network film on seed-free fluorine-doped tin oxide (FTO) substrates without using additive or capping agent is reported. The NW networks are hexagonal phase and the morphologies are changed by adjusting the pH of precursor solutions. Growth mechanism of WO3 NWs is also extensively discussed. The designed porous film exhibits remarkable enhancement of the electrochromic (EC) properties. In particular, a significant optical modulation (57% at 632 nm), fast color switching speed (bleaching: 7 s and coloration: 21 s), high coloration efficiency (120.3 cm(2) C-1 at 632 nm), high Li+ diffusion coefficient (2.14 x 10(-9) cm(2) s(-1)), and excellent cycling stability (87% after 1000 cycles) are achieved for the 3-D NWs film. The improved EC properties are mainly attributed to the highly porous film, which makes the Li+ diffusion becomes easier and provides larger specific surface area for charge-transfer reactions. Furthermore, we also reported an EC device (50 mm x 50 mm) with a simple two-electrode configuration showing high optical contrast. The 3-D WO3 NWs network film acts as an excellent EC material.
URI: http://dx.doi.org/10.1109/TCPMT.2014.2299554
http://hdl.handle.net/11536/24443
ISSN: 2156-3950
DOI: 10.1109/TCPMT.2014.2299554
期刊: IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
Volume: 4
Issue: 5
起始頁: 831
結束頁: 839
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