Journal ArticleDOI
A solar ultraviolet sensor based on fluorescent polyoxometalate and viologen
Hong Liu,Hong Liu,Yang Lv,Si Li,Fan Yang,Sheng Liu,Cheng Wang,Jia-Qi Sun,Hao Meng,Guanggang Gao,Guanggang Gao +10 more
TLDR
In this article, a solar ultraviolet sensitive composite film consisting of fluorescent polyoxometalate and viologen has been readily prepared on solid substrates using a drop casting method, and can be colored and bleached by photoreduction and air oxidation processes.Abstract:
A novel solar ultraviolet sensitive composite film consisting of fluorescent polyoxometalate and viologen has been readily prepared on solid substrates using a drop casting method, and can be colored and bleached by photoreduction and air oxidation processes. A photoswitchable emission has also been observed with the fluorescence intensity returning to its original value after bleaching of the blue-colored film, which is due to the fluorescence resonance energy transfer (FRET) from the excited states of the Eu(III) ions to colored viologen. The decoloration process takes about 2.5 hours under ambient conditions but can be accelerated by humid air. The absorbance change of the composite film is less than 15% even after 8 cycles of variation between the colorless and blue color states. This is also the reason for the emission intensity change of the composite film. Thus, quick-responsive photochromism and switchable fluorescence are realized by a POM-viologen-based film which shows great potential to realize portable devices for solar ultraviolet detection.read more
Citations
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Three viologen-derived Zn-organic materials: photochromism, photomodulated fluorescence, and inkless and erasable prints
TL;DR: Three zinc-viologen compounds, constructed from aromatic carboxylic acid and viologen-derived ligands, display photochromic properties from pale yellow to dark blue after being irradiated by a xenon lamp with different photoresponsive rates.
Journal ArticleDOI
Octahedron-shaped three-shell Ln14-substituted polyoxotungstogermanates encapsulating a W4O15 cluster: luminescence and frequency dependent magnetic properties.
TL;DR: As the first 14-Ln-containing polyoxometalates, the octahedron-shaped three-shell structure of the [(Ln14(H2O)W4(OH)O14)(WO4)4(GeW10O38)6]43- polyanion is made up of a W4 tetrahedron, a Ln14W4 tetRAhedron and a Ge6W60 octahedral unit.
Journal ArticleDOI
Inkjet printing and UV-LED curing of photochromic dyes for functional and smart textile applications
Sina Seipel,Junchun Yu,Aravin Prince Periyasamy,Martina Viková,Michal Vik,Vincent Nierstrasz +5 more
TL;DR: In this paper, the color performance of a photochromic dye embedded in a UV-curable ink resin is investigated. And the influence of industrial fabrication parameters on the crosslinking density of the UV-resin and hence on the colour kinetics is investigated, and an extended kinetic model, which defines rate constants kcolouration, kdecay and kdecolouration, can be predicted.
Journal ArticleDOI
“Reversible” photochromism of polyoxomolybdate–viologen hybrids without the need for proton transfer
TL;DR: A case study of two covalently bonded polyoxomolybdate-viologen hybrids revealed that reversible photochromic properties can be achieved without the need for proton transfer, and the weak electron-withdrawing ability of the coordinated ligand favors photoreduction of Mo(VI) to Mo(V).
Journal ArticleDOI
Ultraviolet light-, temperature- and pH-responsive fluorescent sensors based on cellulose nanocrystals
TL;DR: This type of simple, cheap, dispersible and sensitive fluorescent nanosensor has potential advantages of in situ detection and monitoring of temperature or pH in organisms or water.
References
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Journal ArticleDOI
Polyoxometalate Chemistry: An Old Field with New Dimensions in Several Disciplines
Michael T. Pope,Achim Müller +1 more
TL;DR: Inorganic metal-oxygen cluster anions form a class of compounds that is unique in its topological and electronic versatility and is important in several disciplines, such as analytical and clinical chemistry, catalysis (including photocatalysis), biochemistry, and medicine (antitumoral, antiviral, and even anti-HIV activity) as mentioned in this paper.
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Recent Advances in Polyoxometalate-Catalyzed Reactions
Journal ArticleDOI
Effect of electronic structures of Au clusters stabilized by poly(N-vinyl-2-pyrrolidone) on aerobic oxidation catalysis.
TL;DR: It is proposed that electron transfer from the anionic Au cores of Au:PVP into the LUMO (pi*) of O(2) generates superoxo- or peroxo -like species, which plays a key role in the oxidation of alcohol.
Journal ArticleDOI
Highly efficient hydrogen evolution from seawater by a low-cost and stable CoMoP@C electrocatalyst superior to Pt/C
Yuan-Yuan Ma,Caixia Wu,Xiao-Jia Feng,Huaqiao Tan,Li-Kai Yan,Yang Liu,Zhenhui Kang,Enbo Wang,Yangguang Li +8 more
TL;DR: In this article, a cobalt molybdenum phosphide nanocrystal coated by a few-layer N-doped carbon shell (CoMoP@C) is used for hydrogen evolution reaction.