Photoinduced One-Electron Reduction of MV<sup>2+</sup> in Titania Nanosheets Using Porphyrin in Mesoporous Silica Thin Films

Yui, Tatsuto; Tsuchino, Takako; Itoh, Toshio; Ogawa, Makoto; Fukushima, Yoshiaki; Takagi, Katsuhiko

doi:10.1021/la047385+

Cited by 49 publications

(25 citation statements)

References 11 publications

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“…[38] Alternatively, post-synthesis attachment (frequently called grafting) to attach desired molecules to accessible surfaces can also be used. [19,31,33,35,36] …”

Section: Feature Articlementioning

confidence: 99%

“…Post-synthesis grafting involves the same types of alkoxysilane or chlorosilane linkers that are commonly utilized in the bifunctional strategy. A wide variety of functionalized materials have been produced using the post synthesis grafting method; [19,35] specific examples include mesostructured selective titania membranes, [36] bifunctional accessible mesopores, [31] hybrid materials for light induced charge separation [33] and zeolites with coumarins for light harvesting. [49] The organic functionality that is introduced to the material can also act as a site for further derivatizations.…”

Section: Post Synthesis Grafting Strategymentioning

confidence: 99%

“…[25] Other structured, pore containing materials including mesostructured titania and zirconia, and microporous zeolites have received considerable attention as well. [30][31][32][33][34] Meso-and macrostructured titania have been synthesized, and post synthesis treatment used to induce wall crystallinity without cracking. [30] Mesoporous titania and zirconia, with cubic or 2D hexagonal structure, has been synthesized and further derivatized using post grafting.…”

Section: Introductionmentioning

confidence: 99%

“…[34] Mesoporous silica containing photo electron donors was covered with electron acceptor-containing titania nanosheets for long lived charge separation. [33] Considerable advances in functionalizing these materials have also been made using both one pot one step derivatization and derivatization after completion of their synthesis (post synthesis grafting). [19,31,[35][36][37] In this feature article, we focus on the uses of mesostructured silica supports for functional materials and molecular machines.…”

Section: Introductionmentioning

confidence: 99%

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Mesostructured Silica Supports for Functional Materials and Molecular Machines

Angelos

Johansson

Stoddart

et al. 2007

Adv Funct Materials

188

148

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Mesostructured silica thin films and particles prepared by surfactant‐templated sol–gel techniques are highly versatile substrates for the formation of functional materials. The ability to deliberately place molecules possessing desired activities in specific spatially separated regions of the nanostructure is an important feature of these materials. Such placement utilizes strategies that exploit the physical and chemical differences between the silica framework and the templated pores. As an example of placement of pairs of molecules, donor and acceptor molecules can be targeted to different regions of mesostructured thin films and energy transfer between them can be measured. The results not only demonstrate the spatial separation but also are used as a molecular ruler to measure the average distance between them. Mesostructured silica is also an excellent support for molecular machines. Molecules that undergo large amplitude motion, when attached to the silica, can function as impellers and nanovalves when activated by light, electrical (redox) and chemical (pH, competitive binding) energy. Derivatized azobenzene molecules, attached to pore walls by using one of the placement strategies, function as impellers that can move other molecules through the pores. Rotaxanes and pseudorotaxanes, placed at pore entrances, function as gatekeepers that can trap and release molecules from the pores when stimulated. Deliberately placed functional molecules on and in mesostructured silica offer many possibilities for both fundamental studies on the nanoscale and for applications in fields as diverse as fluidics, biological drug delivery and controlled release.

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“…[38] Alternatively, post-synthesis attachment (frequently called grafting) to attach desired molecules to accessible surfaces can also be used. [19,31,33,35,36] …”

Section: Feature Articlementioning

confidence: 99%

Section: Post Synthesis Grafting Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mesostructured Silica Supports for Functional Materials and Molecular Machines

Angelos

Johansson

Stoddart

et al. 2007

Adv Funct Materials

188

148

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“…4 Because of these desirable characteristics, viologens have been largely investigated in solutions, the immobilized electrodes by the casting and molecular assembly techniques, the diads or triads with other optical molecules, as well as in the hybrids with mesoporous or inorganic nanomaterials. 5 Garcia and coworkers recently prepared a hybrid of single-walled CNTs (SWCNTs) covalently anchored viologens, which was able to form a charge-transfer complex * Author to whom correspondence should be addressed. with 2,6-dimethoxynaphthalene.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry of Single-Walled Carbon Nanotubes-Viologen Composites on the Glass Carbon Electrodes

Wang

Liu²,

Chen³

et al. 2009

J. Nanosci. Nanotech.

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Nafion-carbon nanotubes-viologen composites have been immobilized on glass carbon electrode surfaces. The mixtures of Nafion-carbon nanotubes could largely stabilize the viologen-modified films due to their strong adhesion on the electrode surface and the intermolecular electrostatic interaction between Nation (carbon nanotubes) and viologens. Voltammetric measurements revealed well reversible redox couples corresponding to the viologen groups. The potential differences DeltaEp and the product of De(1/2)C were closely dependant on the substituent groups of the viologens co-assembled.

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Two‐Dimensional Metal Oxide and Metal Hydroxide Nanosheets: Synthesis, Controlled Assembly and Applications in Energy Conversion and Storage

Elshof

Yuan

Rodriguez

2016

Advanced Energy Materials

210

119

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He is currently focusing on the development of high temperature lubricants from 'soft' ceramic nanoparticles such as layered metal oxides and organosilica networks.catalysis [26] and energy storage. [27] The most widely investigated classes of exfoliated oxide nanosheets are titanates, [28] niobates [29] and titanoniobates, but various other compositions are now also known, as described in more detail below. Table 1. State of the art metal oxide nanosheet compounds. Compound name Exfoliation method Energy application(s) Remarks Ti 0.87 O 2 0.52-Acid-base by TBAOH [19b,32d] Thin film supercapacitors, [49] batteries, [50] piezos, [51] photocatalysis [52] Lateral size up to 100 μm [32d] Fe 0.8 Ti 1.2 O 4 0.8-Acid-base by TBAOH [41d] Photocatalysis [53] Ni 0.4 Ti 1.6 O 4 0.8-Acid-base by TBAOH Photocatalysis [53] Ti 0.91 O 2 0.36−Acid-base by TBAOH [18,54] Photovoltaics, [55] batteries, [56] fuel cells, [57] acid catalysis, [58] photocatalysis [59] Ti 4 O 9 2-Acid-base by TBAOH [37] Batteries, [37,60] fuel cells, [61] photocatalysis [59a,62] MnO 2 0.4-Acid-base by TBAOH [35] Supercapacitors, [35,63] Photovoltaics, [64] batteries, [65] photocatalysis [59a] Mn 1-x Ru x O 2 (x = 0.05 and 0.1) Acid-base by TBAOH [42] Supercapacitors [42] RuO 2 0.2-Acid-base by TBAOH [66] Supercapacitors, [67] fuel cells [68] Ca 2 Nb 3 O 10 − Acid-base by TBAOH [69] Ca 2 Nb 3 O 10−x N y -Acid-base by TBAOH [74] Photocatalysis [74] Ca 2 Na n−3 Nb n O 3n+1 − (n = 4, 5, 6) Acid-base by TBAOH [71] Ca 2-x Sr x Nb 3 O 10 -(x = 0, 0.5, 1, 1.5, 2) Acid-base by TBAOH [75] Photocatalysis [75] Ca 2 Nb 3-x Ta x O 10 -(x = 0.3, 1, 1.5) Acid-base by TBAOH [75] Photocatalysis [75] Ca 2 Nb 3-x Rh x O 10−δ -Acid-base by TBAOH [76] Photocatalysis [76] SrNb 2 O 6 F − Acid-base by TBAOH [69] (Eu 0.56 Ta 2 O 7 ) 2-Acid-base by TBAOH [77] TaO 3 -Acid-base by TBAOH [38] Batteries, [56b] photocatalysis [78] Sr 1.5 Ta 3 O 10 2-Acid-base by TBAOH [79] CaNaTa 3 O 10 2-Acid-base by TBAOH [20] Ca 2 Ta 3 O 10-x N y -Acid-base by TBAOH [44] Photocatalysis [44] Sr 2−x Ba x Ta 3 O 10-y N z -(x = 0.0, 0.5, 1.0) Acid-base by TBAOH [80] Photocatalysis [80] SrLaTi 2 TaO 10 2-Acid-base by TBAOH [20] Ca 2 Ta 2 TiO 10 2-Acid-base by TBAOH [20] Ti (5.2-2x)/6 Mn x/2 O 2 (x = 0.1, 0.2, 0.3, 0.4) Acid-base by TBAOH [81] Ti 1−x−y Fe x Co y O 2 (0 ≤ x ≤ 0.4 and 0 ≤ y ≤ 0.2) Acid-base by TBAOH [82] Cs 4 W 11 O 36 2-Acid-base by TBAOH [83] (MWO 6 ) -(M = Nb, Ta) Acid-base by TBAOH [45] Acid catalysis, [84] photocatalysis [85] NbMoO 6 -Acid-base by TBAOH [86] Acid catalysis [86,87] W 2 O 7 2-Acid-base by TMAOH [45] Photocatalysis [88] (Ti 1.825-x Nb x O 4 ) 0.7-(x = 0-0.03) Acid-base by TBAOH [89] (Ti 1.65 Mg 0.35 O 4 ) 0.7-Acid-base by TBAOH [90] Attempt to make (Ti 1.65 Ni 0.35 O 4 ) 0.7failed [91]Nb 3 O 8 -Acid-base by TBAOH [92] Acid catalysis, [92] photocatalysis [36,93] Nb 6 O 17 4-Acid-base by TBAOH [94] and intercalation of n-propylamine [95] Photovoltaics, [96] photocatalysis [59a][73c,97] TiNbO 5 − Acid-base by TBAOH [71] Batteries, [71] photovoltaics, [71] b...

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Photoinduced One-Electron Reduction of MV²⁺ in Titania Nanosheets Using Porphyrin in Mesoporous Silica Thin Films

Cited by 49 publications

References 11 publications

Mesostructured Silica Supports for Functional Materials and Molecular Machines

Mesostructured Silica Supports for Functional Materials and Molecular Machines

Electrochemistry of Single-Walled Carbon Nanotubes-Viologen Composites on the Glass Carbon Electrodes

Two‐Dimensional Metal Oxide and Metal Hydroxide Nanosheets: Synthesis, Controlled Assembly and Applications in Energy Conversion and Storage

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Photoinduced One-Electron Reduction of MV2+ in Titania Nanosheets Using Porphyrin in Mesoporous Silica Thin Films

Cited by 49 publications

References 11 publications

Mesostructured Silica Supports for Functional Materials and Molecular Machines

Mesostructured Silica Supports for Functional Materials and Molecular Machines

Electrochemistry of Single-Walled Carbon Nanotubes-Viologen Composites on the Glass Carbon Electrodes

Two‐Dimensional Metal Oxide and Metal Hydroxide Nanosheets: Synthesis, Controlled Assembly and Applications in Energy Conversion and Storage

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Photoinduced One-Electron Reduction of MV²⁺ in Titania Nanosheets Using Porphyrin in Mesoporous Silica Thin Films