Visible Light-Induced Electron Transfers in Titania Nanosheet and Mesoporous Silica Integrated Films

Abstract

Two spatially different nano-structured inorganic materials, titania nanosheets (TNS) and mesoporous silica (MPS), were integrated onto a glass substrate to form stacked composite thin films. Investigations were then carried out on photoinduced electron transfers between the tetrakis(1-methylpyridinium-4-yl)porphyrinatometal (4+)

<em>In Situ</em> Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

“…On the other hand, layered metal oxide semiconductors (LMOSs) exhibit photocatalytic properties and have a large surface area, typically several hundred square meters per unit g of an LMOS [15][16][17] . In addition, various LMOSs have intercalation properties (i.e., various chemical species can be accommodated within their expandable and large interlayer spaces) [15][16][17][18][19][20] . Thus, with a combination of MNPs and LMOSs, it is expected that relatively large amounts of MNPs are hybridized with the semiconductor photocatalysts.…”

“…We have reported the first in situ synthesis of copper nanoparticles (CuNPs) 21 within the interlayer space of LMOS (titania nanosheet; TNS [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] ) transparent films through very simple steps. However, the details of the synthetic procedures and the characterization of the other noble MNPs and TNS hybrids have not yet been reported.…”

Efficient light harvesting via sequential two-step energy accumulation using a Ru–Re5 multinuclear complex incorporated into periodic mesoporous organosilica

“…Very recently, Re(I)-complex photocatalysts for CO 2 reduction were successfully incorporated into MOFs, 46,47 but the LH function was not clearly shown in these systems. Although mesoporous silica was also used as an inorganic host for various guest molecules, such as emissive metal complexes and organic chromophores, [48][49][50][51][52][53][54][55][56] there have been no reports on the addition of LH functionality to these systems. It should be noted therefore that two-step light accumulation systems constructed from both many light absorbers and a much smaller number of energy relay units together with a nal energy acceptor have not been yet reported, to the best of our knowledge.…”

Microscopic Structure of Separately Accommodated Porphyrins and Viologens in Mesoporous Silica and Titania Nanosheet Hybrid Films

“…We . have reported [9,10] on the syntheses of consecutively stacked hybrid thin films of mesoporous silica (MPS) and layered titania nanosheets (TNS)[2b,c,11] and the accommodation of two different photofunctional organic molecules, i.e., cationic metalloporphyrin derivatives (tetrakis ( 1-methylpyridinium-4-yl) Upon irradiation of the TNS within the (MV 2 +-TNS)/(H 2 TMPyP-MPS) films by UV light (TNS excitation), one-electron reduced MV 2 + radical ions (MV+") were formed at the expense of the one-electron oxidative consumption of the H 2 TMPyP ions, i.e., a charge separation (CS) between the two could be achieved. Interestingly, the CS observed within the (TNS)/(MPS) hybrids was thermally stable, even in ambient atmosphere, and this stability was retained even after several hours, [12] although its origin has yet to be clarified.…”