Effects of synthetic conditions and heat-treatment on the structure of partially ion-exchanged titanate nanotubes

Yoshida, Ryuhei; Suzuki, Yoshikazu

doi:10.1016/j.matchemphys.2004.12.010

Cited by 184 publications

(108 citation statements)

References 19 publications

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“…Figures 6(a) and (b) demonstrate the top and crosssection views of the PNW cell, respectively. Although a large part of TiO 2 nanowires converted into equi-axed nanoparticles after the sintering process as with the titanate nanotubes in references [19,40,41] approximately 5-10 % of the 1-D nanowires still remained and could be clearly observed. From the top views, it is observed that rela- tively large nanowire-bundles bridged nanoparticles' aggregates, which presumably offer the electron conducting path as well as prevent the formation of relatively large open pores or microcracking amongst aggregated particles.…”

Section: Discussionmentioning

confidence: 99%

“…Although some fragmentation and sintering ocurred, a large portion of nanowires still retained their one-dimensional morphology. In other words, the partially nanowire-structured TiO 2 in this study had a higher thermal stability compared with titanate (or titania) nanotubes [19,[40][41][42][43]. Thus, during the sintering process for DSC devices, a portion of nanowires (∼10 %) remained in the porous film.…”

Section: Discussionmentioning

confidence: 99%

“…• C [19,[40][41][42][43], which is close to the sintering temperature of DSC's porous electrode (∼500 • C).…”

Section: Introductionmentioning

confidence: 91%

“…In order to improve various functions of TiO 2 powder viz phase, size and morphology, the various factors have been extensively studied. Since the innovative work by Kasuga et al in 1998-99 [1,2], TiO 2 -derived one-dimensional (1-D) nanomaterials synthesized by the hydrothermal alkali treatment method, such as nanotubes [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], nanowires [21][22][23][24][25], and nanofibers [26][27][28], have attracted much attention because of their unique microstructure and promising energy-related applications.e.g., lithium ion batteries [23,24,29], hydrogen storage [30,31], and dye-sensitized solar cells (DSCs) [32].…”

Section: Introductionmentioning

confidence: 99%

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Partially nanowire-structured TiO2 electrode for dye-sensitized solar cells

2006

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Partially nanowire-structured TiO 2 was prepared by a hydrothermal processing followed by calcination in air. The hydrogen titanate powder as-synthesized was calcined at 300• C for 4 h to obtain the partially nanowire-structured TiO 2 . A dye-sensitized solar cell (DSC) with a film thickness of 5.6 μm, fabricated using the partially nanowire-structured TiO 2 showed better performance than using a fully nanowire-structured TiO 2 or a conventional equi-axed TiO 2 nanopowder. The short-circuit current density (J SC ), the open-circuit voltage (V OC ), the fill factor (FF) and the overall efficiency (η) are 11.9 mA/cm 2 , 0.754 V, 0.673 and 6.01 %, respectively. The effects of one-dimensional nanostructure and electron expressway concept are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…• C [19,[40][41][42][43], which is close to the sintering temperature of DSC's porous electrode (∼500 • C).…”

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Partially nanowire-structured TiO2 electrode for dye-sensitized solar cells

2006

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“…Moreover, the surface characteristics of TNTs might vary with the synthesis conditions, including the reaction time, synthesis temperature, acid concentration during washing, and calcination temperature (Weng et al, 2006;Lee et al, 2008). By exploiting its properties, several researchers have used TNTs to adsorb basic dyes or cations in aqueous systems (Yoshida et al, 2005;Lee et al, 2007Lee et al, , 2010. TNTs have rarely been used for adsorbing organic vapors.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Volatile Organic Compounds on Organic Substance-Modified Titanate Nanotubes

Wang

Peng

Chao

2015

Aerosol Air Qual. Res.

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This study investigates the removal of volatile organic compounds (VOCs) from the air through the use of organic substance-modified titanate nanotubes (TNTs). The TNTs were derived from TiO 2 through a hydrothermal method, and were modified using hexadecyltrimethylammonium bromide and octadecyltrichlorosilane (OTS) to change the surface hydrophilicity to hydrophobicity. The properties of the TNT and modified TNT were characterized through scanning electron microscopy , transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, contact angle measurements, and nitrogen adsorption-desorption isotherms. The fabricated adsorbents were used to remove the VOCs of toluene, ethylbenzene 1,1,2-trichloroethane, and tetrachloroethene in the air. The adsorption amounts of the VOCs were estimated using the Thomas equation. The results revealed that adsorbent modification raised the adsorption capacities of these VOCs, which also grew with increasing surface hydrophobicity. The aromatic compounds accumulated easily in the pores to generate relatively high adsorption amounts. VOCs adsorbed on the TNT surface or partitioned into the organic substance on TNTs. The adsorption amounts of VOCs on the OTSmodified TNTs were higher than those on commercial activated carbon. The results imply that organic substance-modified TNTs can effectively remove VOCs in the air and become excellent adsorbents.

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