Electrochromic properties of tungsten oxide nanowires fabricated by electrospinning method

Shim, Hee-Sang; Kim, Jeong Won; Sung, Yung‐Eun; Kim, Won

doi:10.1016/j.solmat.2009.02.008

Cited by 140 publications

(76 citation statements)

References 26 publications

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“…Considering that the electrochemical deposition of V 2 O 5 carried out in galvanostatic conditions lead to the formation of mixed oxides, a certain percentage of V oxides in lower oxidation state (IV and III) is always present by making the ECD electrochemically switchable by oxidation from the first cycle of potential application [23]. The electrochemical switching time of complete cell was found identical to that of single electrode, that is, ST C = 2 s and ST B = 1 s. Such values for colouring and bleaching processes are a clear enhancement with respect to those reported previously for similar systems [11,25,26]. As representative example an electrochromic device containing methacrylate-based gel polymer electrolytes (PE) was reported by Reiter et al [11].…”

Section: Electrochemical Measurementssupporting

confidence: 61%

Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

Garino

Zanarini

Bodoardo

et al. 2013

International Journal of Electrochemistry

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An optimized thermoset gel polymer electrolyte based on Bisphenol A ethoxylate dimethacrylate and Poly(ethylene glycol) methyl ether methacrylate (BEMA/PEGMA) was prepared by facile photo-induced free radical polymerisation technique and tested for the first time in electrochromic devices (ECD) combining WO 3 sputtered on ITO as cathodes and V 2 O 5 electrodeposited on ITO as anodes. The behaviour of the prepared ECD was investigated electrochemically and electro-optically. The ECD transmission spectrum was monitored in the visible and near-infrared region by varying applied potential. A switching time of ca. 2 s for Li + insertion (coloring) and of ca. 1 s for Li + de-insertion (bleaching) were found. UV-VIS spectroelectrochemical measurements evidenced a considerable contrast between bleached and colored state along with a good stability over repeated cycles. The reported electrochromic devices showed a considerable enhancement of switching time with respect to the previously reported polymeric ECD indicating that they are good candidates for the implementation of intelligent windows and smart displays.

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Section: Electrochemical Measurementssupporting

confidence: 61%

Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

Garino

Zanarini

Bodoardo

et al. 2013

International Journal of Electrochemistry

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“…Gang Gu et al investigated the formation of isolated tungsten oxide nanowires directly grown on tungsten tips and plates [16]. Moreover, Shim et al reported electrochromic properties of polycrystalline WO 3 nanowire electrodes fabricated on an indium tin oxide coated substrate by electrospinning method [17]. Among the mentioned methods, the direct growth of NWs has attracted much attention due to its simplicity, cheapness and samples high degree of crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

et al. 2018

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In this work, tungsten oxide nanowires were grown directly on a tungsten substrate in 800 °C using thermal evaporation method in a horizontal tube furnace. The effect of growth time on structural, morphological, elemental composition and electrical properties of the tungsten oxide nanostructures was investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS) technique and KIETHLEY 2361 system. Our experimental results show that tungsten oxide nanowires crystalline phase, electrical conductance and density on the substrate surface depend on the growth time. The XRD results showed that tungsten oxide nanowires are synthesized with a cubic WO 3 structure. Moreover, the lattice strain, grain size and dislocation density were obtained in three different growth time. It is noteworthy that by increasing the growth time the crystallinity increases. The FESEM images at different growth times showed that the nanowires on grains begin to germinate when the growth time increases to 6 h. At this time, nanowire structures with 1 µm in diameter and 40 µm in length were formed and continued to grow which caused a change in the morphology. In addition, the XPS results showed that the sample that has grown at longer growth time exhibit two asymmetric W4d5/2 and W4d3/2 peak at 252 and 263 eV which can be assigned to W5+ and W4+ species, respectively. Moreover, the linear I-V curves are obtained and it is found that by increasing the growth time, the conductivity of the sample increases due to increasing number of wires on the sample surface. Finally, the conditions and mechanism of WO 3 nanowire growth are discussed. The results can be used to guide a better understanding about the growth behavior of WO 3 nanowires and can contribute towards the development of novel nanodevices.

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“…This decreases their band gap value from 3.30 to 2.0 eV. [28] Therefore, the oxygen deficiencies within the nanostructures were responsible for the decrease in the band gap value of theW 17 O 47 nanothick plates in the present research. Recently, the band gap value of the W 18 O 49 nanorod bundles has been reported ∼2.95 eV.…”

Section: Resultsmentioning

confidence: 52%

Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity

Azimirad

Khosravi

Moshfegh

2011

Surface & Interface Analysis

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A simple method for synthesis of W 17 O 47 nanothick plates by annealing sol-gel-deposited tungsten oxide thin films on soda lime substrate has been reported. After heat treatment of the dried thin films at 700• C in N 2 ambient for 60 min, W 17 O 47 nanothick plates with [100] orientation were obtained. The synthesized product was characterized and analyzed by, X-ray diffraction (XRD), SEM, XPS and ultraviolet-visible spectrophotometery. According to SEM observations, nanothick plates grew with random orientations on the surface. In addition, it was observed that some of the nanothick plates were constituted from several nanosheets. XRD analysis determined that the nanothick plates were mainly composed of monoclinic W 17 O 47 phase with strong (500) diffraction peak and about 50 nm average crystalline size. Basing on XPS analysis, the surface composition of the nanothick plates was determined WO 2.78 . It was found that the 60 min annealed sample has the maximum number of nanothick plates per unit area over the surface as compared to the samples annealed for 15, 45 and 80 min. In addition, the photocatalytic degradation of methylene blue over this sample exhibited the highest photoactivity rate. A mechanism for photocatalytic activity of the W 17 O 47 nanothick plates was also proposed.

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Electrochromic properties of tungsten oxide nanowires fabricated by electrospinning method

Cited by 140 publications

References 26 publications

Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity

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Electrochromic properties of tungsten oxide nanowires fabricated by electrospinning method

Cited by 140 publications

References 26 publications

Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

Fast Switching Electrochromic Devices Containing Optimized BEMA/PEGMA Gel Polymer Electrolytes

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

Synthesis of W17O47 nanothick plates with preferred orientation and their photocatalytic activity

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Synthesis of W₁₇O₄₇ nanothick plates with preferred orientation and their photocatalytic activity