New ultra-violet and near-infrared blocking filters for energy saving applications: fabrication of tantalum metal atom cluster-based nanocomposite thin films by electrophoretic deposition

Nguyen, Thi Kim Ngan; Renaud, Adèle; Wilmet, Maxence; Dumait, Noée; Paofai, Serge; Dierre, Benjamin; Chen, Wanghui; Ohashi, Naoki; Cordier, Stéphane; Grasset, Fabien; Uchikoshi, Tetsuo

doi:10.1039/c7tc02454a

Cited by 45 publications

(54 citation statements)

References 77 publications

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“…The transformation from {Ta 6 Br 12 } 2+ species (in TBH and its sol) to {Ta 6 Br 12 } 3+ species (in {Ta 6 Br 12 }@SiO 2 nanoparticles) was possibly due to the accelerated oxidation rate of [{Ta 6 Br i 12 }(H 2 O) a 6 ] 2+ cluster units in basic solution. Though this process can hardly be prevented at current stage of this study, the obtained SiO 2 nanoparticles functionalized by {Ta 6 Br 12 } 3+ species are still very interesting for UV-NIR blockers or other optical applications, attributed to their strong absorptions in both the UV and NIR regions [5, 6]. Furthermore, the apical ligands of the {Ta 6 Br 12 } in phase (1) can be either H 2 O or OH − but not Br − , as the XPS characterization revealed the apical Br dissociated within the RM based process.…”

Section: Discussionmentioning

confidence: 99%

“…More recently, they have been proposed as efficient UV-NIR blockers for the potential application in saving energy window technology [5, 6]. Most hexanuclear tantalum bromides possess the cluster cores of {Ta 6 Br 12 }, which consists of an octahedral Ta 6 atom cluster and the 12 inner Br ligands bridging over all the 12 Ta-Ta bonds [7].…”

Section: Introductionmentioning

confidence: 99%

“…1 nm) and the distinct electronic structure brought by the coexistence of metal-metal and covalent bonds, while they also bear the starting point of various solution based chemical/physical reactions to obtain various kinds of [{Ta 6 Br i 12 }L a 6 ] derivatives [7, 10, 16, 17, 18, 19]. Moreover, the electronic structure of discrete {Ta 6 Br 12 } species endows their variable optical property, depending on both the oxidation state of {Ta 6 Br 12 } (2+, 3+ or 4+) and the properties of apical ligands –thus they can be used as the dye for transparent optical devices [5, 6, 20, 21, 22]. Meanwhile, the ion-like behaviors and ultra-small size of the discrete {Ta 6 Br 12 } species can facilitate their homogeneous distribution in matrix and minimize the decreasing on transparency.…”

Section: Introductionmentioning

confidence: 99%

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Embedding hexanuclear tantalum bromide cluster {Ta6Br12} into SiO2 nanoparticles by reverse microemulsion method

Chen

Wilmet

Truong

et al. 2018

Heliyon

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Hexanuclear tantalum bromide cluster units [{Ta6Bri12}La6] (i = inner, a = apical, L = ligand OH or H2O) are embedded into SiO2 nanoparticles by a reverse microemulsion (RM) based method. [{Ta6Bri12}Bra2 (H2O)a4]·nH2O (noted TBH) and tetraethyl orthosilicate (TEOS) are used as the starting cluster compound and the precursor of SiO2, respectively. The RM system in this study consists of the n-heptane (oil phase), Brij L4 (surfactants), ethanol, TEOS, ammonia solution and TBH aqueous sol. The size and morphology of the product namely {Ta6Br12}@SiO2 nanoparticles are analyzed by HAADF-STEM and EDS mappings. The presence and integrity of {Ta6Br12} in the SiO2 nanoparticles are evidenced by EDS mapping, ICP-OES/IC and XPS analysis. The optical properties of {Ta6Br12}@SiO2 nanoparticles are analyzed by diffuse reflectance UV-vis spectroscopy, further evidencing the integrity of the embedded {Ta6Br12} and revealing their oxidation state. Both {Ta6Br12}2+ and {Ta6Br12}3+ are found in SiO2 nanoparticles, but the latter is much more stable than the former. The by-products in this RM-based synthesis, as well as their related factors, are also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Embedding hexanuclear tantalum bromide cluster {Ta6Br12} into SiO2 nanoparticles by reverse microemulsion method

Chen

Wilmet

Truong

et al. 2018

Heliyon

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“…physicochemical behaviors related to a wide variety of long-range structural arrangements, several possible oxidation states of the cluster units and an ability to strongly absorb light in the UV-vis-NIR. [50][51][52] This opens up an avenue for potential applications in catalysis, [53] biology, [54][55][56][57] energy saving applications, [51,52] etc. Much attention is paid to the face-capped…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…technique (EPD). This was recently successfully applied to the deposition of Mo 6 [71][72][73][74] or Ta 6 [52,74]…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Preparation by electrophoretic deposition of molybdenum iodide cluster-based functional nanostructured photoelectrodes for solar cells

Renaud

Nguyen

Grasset

et al. 2019

Electrochimica Acta

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This work explores the potentiality of Mo 6 clusters as new inorganic sensitizers with amphoteric properties for photoelectronic applications being non-toxic and stable. It reports on the design of photoelectrodes by electrophoretic deposition (EPD) of molybdenum octahedral metal cluster iodide (CMI) onto mesoporous TiO 2 and NiO layers before being deposited on FTO (i. e. CMI@TSO@FTO, TSO = TiO 2 or NiO). Indeed, the low-cost, lowwaste and industrially scalable EPD method has allowed for the achievement of transparent,

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Inorganic Niobium and Tantalum Octahedral Cluster Halide Compounds with Three-Dimensional Frameworks: A Review on Their Crystallographic and Electronic Structures

Lemoine

Halet

Cordier

2019

Structure and Bonding

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This review summarizes the development of the rich crystal and bonding chemistry of facecapped and edge-bridged inorganic niobium and tantalum octahedral cluster halide compounds, with a particular emphasis on those showing three-dimensional cluster frameworks. Discussion is made on varied structures and bonding which are intimately linked to the valence electron concentration, i.e., the number of electrons that held the octahedral metal cluster architecture. Exploration of the literature indicates that apart from Nb6I11 and derivatives, which show electron-deficient face-capped M6X i 8X a 6 units, compounds containing edge-bridged M6X i 12X a 6 motifs are the most largely encountered. Closed-shell compounds with a valence electron concentration of 16 are predominant, although a few 15-electron open-shell magnetic compounds or even 14-electron closed-shell species have also been reported. Particularly interesting from a structural point of view is the fashion in which these facecapped and edge-bridged clusters "pack" in crystals. The astonishing diversity of structural types, which are observed, is mainly due to the flexibility of the halogen ligands to coordinate in various manners to metal atoms. However, a rigorous structural analysis of these compounds reveals no close relationship between the valence electron concentration and the variability of the intercluster connections and/or the nature of the counter-ions. Indeed, the main bonding features of these compounds can be understood from the delocalized bonding picture of isolated 'molecular-like' M6X i 8X a 6 or M6X i 12X a 6 clusters. Keywords Crystal structure  Electronic effect  Electronic structure  Halide  Inorganic compound  Interatomic distance  Intercluster distance  Ligand  Matrix effect  Metal-metal bond  Niobium  Octahedral cluster  Structure type  Tantalum  Three-dimensional framework  Valence electron concentration Contents 5 Cluster Frameworks of Structural Formula [M6X i 12X a-a 6/2] 5.1 Cluster Compounds with Linear M-X a-aM Bridges 5.2 Cluster Compounds with Bent M-X a-aM Bridges in Cubic Structure 5.3 Cluster Compounds with Bent M-X a-aM Bridges in Trigonal Structure 5.4 Cluster Compounds with Both Linear and Bent M-X a-aM Bridges 6 Interatomic Distances in Inorganic Nb6 and Ta6 Cluster Halide Compounds with Threedimensional Frameworks 6.1 Cluster Units Based on Face-capped M6X i 8X a 6 Building Blocks 6.2 Cluster Units Based on Edge-bridged M6X i 12X a 6 Building Blocks 7 Structural Relationships Between Crystal Structures Based on Hexagonal, Cubic and Trigonal Symmetry 8 Electronic Structure of Niobium and Tantalum Octahedral Cluster Halide Compounds 8.1 Variable VEC of Nb6I11 and Derivatives 8.2 Electronic Structure of Edge-bridged M6X i 12X a 6 Clusters 9 Summary References

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New ultra-violet and near-infrared blocking filters for energy saving applications: fabrication of tantalum metal atom cluster-based nanocomposite thin films by electrophoretic deposition

Cited by 45 publications

References 77 publications

Embedding hexanuclear tantalum bromide cluster {Ta6Br12} into SiO2 nanoparticles by reverse microemulsion method

Embedding hexanuclear tantalum bromide cluster {Ta6Br12} into SiO2 nanoparticles by reverse microemulsion method

Preparation by electrophoretic deposition of molybdenum iodide cluster-based functional nanostructured photoelectrodes for solar cells

Inorganic Niobium and Tantalum Octahedral Cluster Halide Compounds with Three-Dimensional Frameworks: A Review on Their Crystallographic and Electronic Structures

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