Comparative study of photoinduced wettability conversion between [PW12O40]3−/brookite and [SiW12O40]4−/brookite hybrid films

Pruethiarenun, Kunchaya; Isobe, Toshihiro; Matsushita, Sachiko; Ye, Jinhua; Nakajima, Akira

doi:10.1016/j.matchemphys.2013.12.047

Cited by 20 publications

(10 citation statements)

References 43 publications

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“…As shown in Fig. 76,77 The above results indicate that the photochromic behaviour of the hybrid gel arises from the photo reduction of tungsten. 8a), which were attributed to the binding energy of W 6+ 4f 5/2 and W 6+ 4f 7/2 , respectively.…”

Section: View Article Onlinementioning

confidence: 56%

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Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels

Gao

et al. 2016

Soft Matter

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A series of cationic peptides with alternating lysines and hydrophobic residues were designed and synthesized. These kinds of short peptides with protonated lysines can complex with anionic heteropoly acids (HPAs) to form a stable gel in water/ethanol mixed solution. Circular dichroism spectroscopy showed that the short peptides adopted a mixed conformation (β-sheet and random-coil) within the gel matrix. Scanning and transmission electron microscopy revealed that the heteropoly acids, acting as nanosized cross-linkers, first initiated the self-assembly of the cationic peptides into spherical nanostructures. Then these nanospheres accumulated with each other through hydrogen bonds and hydrophobic interactions to form large sheet-like assemblies, which further interconnected with each other forming continuous 3D network structures. Fourier-transform infrared spectroscopy showed that the structural integrity of the HPAs was maintained during the gelation process. The resultant hybrid gels showed reversible photo- and elecrtro-chromic properties. X-ray photoelectron spectroscopy revealed that the hybrid gels, capable of persistent and reversible changes of their colour, are attributed to the intervalence charge-transfer transition of the HPAs. Reversible information writing and erasing were demonstrated through a repeated photo-lithograph or electric stimuli without significant loss of the gel performance.

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Section: View Article Onlinementioning

confidence: 56%

“…When the blue gel was exposed to air for about two days, the colour completely faded. 76 After UV irradiation, however, the peak at 38.2 eV deconvoluted into two peaks with binding energies of 38.1 and 37.4 eV (Fig. 7a).…”

Section: View Article Onlinementioning

confidence: 99%

Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels

Gao

et al. 2016

Soft Matter

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“…The bandgap of the powder obtained from UV-vis spectra was 2.50 eV. Detailed inspection of the valence band (VB; O2p) top of (Mo 0.5 , W 0.5 )O 3 by XPS revealed that it is slightly positive against that of the brookite type TiO 2 , of which the band position was clarified in our previous study 23). The VB position of (Mo 0.5 , W 0.5 )O 3 was almost the same level as that of WO 3 13) .…”

Section: Anti-bacterial Effectmentioning

confidence: 70%

Anti-Bacterial and Photocatalytic Activities of (Mo0.5, W0.5)O3 with Cu(Mo0.5, W0.5)O4 Prepared by Impregnation Method and Mechanochemical Processing

Mizutani

Sunada²,

Isobe

et al. 2018

Journal of the Japan Society of Colour Material

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Molybdenum trioxide (MoO 3), the most stable oxide of molybdenum, comprises layers of edge-shared MoO 6 octahedra in an orthorhombic crystal 1). This material is commonly applied to catalysts 2-5) , photochromic or electrochromic materials 6,7) , and anti-bacterial agents 8,9). This oxide forms a solid solution ((Mo, W)O 3) with WO 3. Its crystal structure is the same as that of WO 3 1) , a well-known photocatalyst material 10). An earlier study revealed that the particles of (Mo, W)O 3 powder prepared using hydrothermal processing are smaller than particles of pure MoO 3 11). Its bandgap is smaller than pure WO 3. These characteristics indicate that (Mo, W)O 3 is a candidate photocatalyst material for use in visible light. However, the reduction power of (Mo, W)O 3 is insufficient for its use as photocatalyst by itself because the conduction band (CB) of WO 3 decreases (becomes positive) with dissolution of Mo 11,12). Based on the reported value of the CB level of (Mo, W)O 3 , multi-electron reduction of oxygen is infeasible by the modification of Cu-clusters onto the powder surface, which is effective for provision of visible light photocatalytic activity to WO 3 by the interface charge transfer 13). By contrast, Cu reacts with WO 3 and MoO 3 and forms CuWO 4 and CuMoO 4 at 500-800°C in ambient air atmosphere 14,15). Recent reports have revealed that Cu(W 1-x , Mo x)O 4 is an n-type semiconductor with a bandgap of 2.1-2.3 eV. Its valence band (VB) level is located in the bandgap of (Mo, W)O 3 16,17). Very recently, we provided visible light photocatalytic activity to (Mo, W)O 3 powder by modification of Cu(W 1-x , Mo x)O 4 on the surface 18). Detailed analysis revealed that the Hedvall effect 19) at the phase transition of (Mo, W)O 3 from orthorhombic to monoclinic at 400-450°C during heating hastens Cu(W 1-x , Mo x)O 4 formation, and revealed that the resultant construction of Z-scheme between (Mo, W)O 3 and Cu(W 1-x , Mo x)O 4 provides visible light photocatalytic activity. Although this material might exhibit antibacterial effects not only under visible light but also in the dark because of MoO 3 in the surface, this activity has not been examined to date. Moreover, the controllable surface concentration ratio between (Mo, W)O 3 and Cu(W 1-x , Mo x)O 4 is limited in the previous process because of impregnation of a CuCl 2 solution and subsequent one-time heat treatment for the Hedvall effect. It is important to develop a different processing route to evaluate the potential of this material in a wide chemical composition range. Based on this background, we first examined antibacterial activity both in the dark and under visible light using the (Mo 0.5 , W 0.5)O 3 powder with Cu(W 0.5 , Mo 0.5)O 4 prepared in our previous study. Secondly, mechanochemical processing 20,21) was investigated to hybridize Cu(Mo 0.5 , W 0.5)O 4 with (Mo 0.5 , W 0.5)O 3. The photocatalytic activity of the powders prepared through this process was evaluated using decomposition of gaseous 2-propanol (IPA) under visible light 22) .

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“…As shown in Figure 4a,c ompared with the absorption of pristine TiO 2 film, the SiW 12 -TiO 2 film exhibits as lightly highera bsorption range from 300 to 350 nm, which can be ascribed to two reasons: i) the intrinsic absorption of SiW 12 ,i i) the reduced light transmission owing to the more compactS iW 12 -TiO 2 film than that of the pristine TiO 2 film (verified by SEM). [34] In addition, the conductivity of SiW 12 -TiO 2 and pristine TiO 2 films were also investigated by performing the current-voltage (I-V)m easurements ( Figure 4b)o ft he devices with as imple architecture of FTO/compact TiO 2 /pristine TiO 2 or SiW 12 -TiO 2 /Au. [26,33] Clearly, the I-V curveso ft he SiW 12 -TiO 2 -based device exhibit as lightly higher slopet han that of pristine TiO 2 -basedd evice both under dark and light, indicating ah igher conductivityo fS iW 12 -TiO 2 than that of pristineT iO 2 .T his can be attributedt ot he higher conductivity of POMs compared with TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

SiW₁₂–TiO₂ Mesoporous Layer for Enhanced Electron‐Extraction Efficiency and Conductivity in Perovskite Solar Cells

Dong

Yang

et al. 2017

ChemSusChem

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High quality electron-transport layer (ETL) with superior optical and electrical properties is an essential part in high efficient perovskite solar cells (PSCs). In this work, SiW -TiO mesoporous film is prepared by a facile one-step spin-coating deposition method and successfully applied as ETL in PSCs. Compared with pristine TiO -based PSC, the SiW -TiO -based one shows a remarkable enhanced power conversion efficiency (PCE) from 12.00 to 14.66 %, which is owed to the higher conductivity, electron-extraction efficiency, and well-matched energy level alignment of SiW -TiO film. Moreover, the SiW -TiO -based device also shows a good long-time stability in under ambient conditions. This work demonstrates that using polyoxometalates (POMs) to modify the metal-oxide semiconductors is an effective approach for further enhancing the performance of PSCs.

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Comparative study of photoinduced wettability conversion between [PW12O40]3−/brookite and [SiW12O40]4−/brookite hybrid films

Cited by 20 publications

References 43 publications

Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels

Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels

Anti-Bacterial and Photocatalytic Activities of (Mo<sub>0.5</sub>, W<sub>0.5</sub>)O<sub>3</sub> with Cu(Mo<sub>0.5</sub>, W<sub>0.5</sub>)O<sub>4</sub> Prepared by Impregnation Method and Mechanochemical Processing

SiW₁₂–TiO₂ Mesoporous Layer for Enhanced Electron‐Extraction Efficiency and Conductivity in Perovskite Solar Cells

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Comparative study of photoinduced wettability conversion between [PW12O40]3−/brookite and [SiW12O40]4−/brookite hybrid films

Cited by 20 publications

References 43 publications

Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels

Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels

Anti-Bacterial and Photocatalytic Activities of (Mo<sub>0.5</sub>, W<sub>0.5</sub>)O<sub>3</sub> with Cu(Mo<sub>0.5</sub>, W<sub>0.5</sub>)O<sub>4</sub> Prepared by Impregnation Method and Mechanochemical Processing

SiW12–TiO2 Mesoporous Layer for Enhanced Electron‐Extraction Efficiency and Conductivity in Perovskite Solar Cells

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SiW₁₂–TiO₂ Mesoporous Layer for Enhanced Electron‐Extraction Efficiency and Conductivity in Perovskite Solar Cells