N-doped titanate nanostructures on gradient surface layer of one dimensional nanofibers synthesized on Ti electrode by chemical and thermal treatments

Khanna, Rohit; Yamaguchi, Seiji; Valanezhad, Alireza; Matsushita, Tomiharu; Naruta, Yoshinori; Takadama, Hiroaki

doi:10.1039/c3ta13728g

Cited by 5 publications

(4 citation statements)

References 33 publications

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“…23,24 In the present study, some amount of nitrogen was incorporated into the surface layer of the chemically treated Ti metal, and even the oxygen-decient titanium oxide Ti 4 O 7 was formed by the heat treatment with the mild conditions of N 2 atmosphere and temperature of 650 C. These phenomena may be explained as follows. 25 Although the specic surface area of the metal was somewhat decreased by the heat treatment, it was still 63 times larger than that of the theoretical at surface. 2, the supplied N 2 gas could not pass thorough the porous disc without giving its contaminated oxygen.…”

Section: Discussionmentioning

confidence: 91%

“…A TEM study revealed that nitrogen-doped and defective titanium oxides were tend to be formed in the top of the surface layer, whereas TiN x O 1Àx and Ti 2 N were formed in the bottom. 25 Although the specic surface area of the metal was somewhat decreased by the heat treatment, it was still 63 times larger than that of the theoretical at surface. The decrease in the specic surface area might be due to the sintering of the surface layer during the heat treatment, as seen in Fig.…”

Section: Discussionmentioning

confidence: 91%

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Preparation of a titanium metal electrode with a nitrogen-doped one-dimensional titanium oxide surface layer for the support of catalysts

et al. 2015

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A Ti metal electrode with nanostructured titanium oxide that possesses high electrical conductivity, a large specific surface area and the capacity for supporting catalysts was prepared by a simple solution and heat treatment. A precursor of the electrode that possesses one-dimensional hydrogen titanate, H 2 Ti 3 O 7 , 600 nm in thickness was produced by soaking the metal in 5 M NaOH at 60 C and subsequently in a 0.5 mM HCl solution at 40 C. The treated metal had a high specific surface area approximately 100 times higher than theoretical flat surface, but its scratch resistance was low. The heat treatment of the hydrogen titanate at 650 C for 1 h under air increased the scratch resistance markedly, but resulted in the development of an electric insulated surface layer that was composed of anatase and rutile. In contrast, when heat-treated under an N 2 atmosphere, the hydrogen titanate was transformed into anatase containing a small amount of Ti 4 O 7 , TiN, TiN x O 1Àx and Ti 2 N, which exhibited a relatively higher electrical conductivity that was in the range of semiconducting materials. It was also shown that the treated metal immobilized 1,1 0 -ferrocenylbis(phosphonic acid) by forming a Ti-O-P bond and thereby induced a high electric current upon cyclic voltammetry, although the treated metal before the ferrocene modification showed almost no electric current. Thus, the treated Ti metal is expected to be useful as an electrode for various types of electrochemical systems due to its high specific surface area, electrical conductivity and large capacity for supporting catalysts.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 91%

Preparation of a titanium metal electrode with a nitrogen-doped one-dimensional titanium oxide surface layer for the support of catalysts

et al. 2015

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“…Although the demand for topographical surface structures on the nanometer scale exhibiting gradients of at least one geometrical parameter has been increasing, the corresponding fabrication technology for practical implementation is still lagging behind. The driving motivation for surface structures which, for example are graded vertically or laterally in composition or in thickness, may be related to searching for new or improved chemical [1] or electrochemical [2] properties. Also biological surface properties can be of interest like lateral gradients of porosity allowing a fast screening of stem cell behavior on top of such substrates [3].…”

Section: Introductionmentioning

confidence: 99%

“…1 Current address: Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.…”

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confidence: 99%

Arrays of quasi-hexagonally ordered silica nanopillars with independently controlled areal density, diameter and height gradients

Özdemir

Huang

Plettl³

et al. 2015

Nanotechnology

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A consecutive fabrication approach of independently tailored gradients of the topographical parameters distance, diameter and height in arrays of well-ordered nanopillars on smooth SiO2-Si-wafers is presented. For this purpose, previously reported preparation techniques are further developed and combined. First, self-assembly of Au-salt loaded micelles by dip-coating with computer-controlled pulling-out velocities and subsequent hydrogen plasma treatment produce quasi-hexagonally ordered, 2-dimensional arrays of Au nanoparticles (NPs) with unidirectional variations of the interparticle distances along the pulling direction between 50-120 nm. Second, the distance (or areal density) gradient profile received in this way is superimposed with a diameter-controlled gradient profile of the NPs applying a selective photochemical growth technique. For demonstration, a 1D shutter is used for locally defined UV exposure times to prepare Au NP size gradients varying between 12 and 30 nm. Third, these double-gradient NP arrangements serve as etching masks in a following reactive ion etching step delivering arrays of nanopillars. For height gradient generation, the etching time is locally controlled by applying a shutter made from Si wafer piece. Due to the high flexibility of the etching process, the preparation route works on various materials such as cover slips, silicon, silicon oxide, silicon nitride and silicon carbide.

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Tantalum nitride nanotube photoanodes: Establishing a beneficial back-contact by lift-off and transfer to titanium nitride layer

Wang

Mazare

Hwang

et al. 2016

Electrochemistry Communications

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In this work we introduce the use of TiN/Ti2 N layers as a back contact for lifted-off membranes of anodic Ta3N5 nanotube layers. In photoelectrochemical H2 generation experiments under simulated AM 1.5G light, shift of the onset potential for anodic photocurrents to lower potentials is observed, as well as a higher magnitude of the photocurrents compared to conventional Ta3N5 nanotubes (~0.5 V RHE ). We ascribe this beneficial effect to the improved conductive properties of the TiNx -based back contact layer that enables a facilitated electron-transport for tantalum-nitride based materials to the conductive substrate.Key words: tantalum nitride; nanotube membranes; titanium nitride; water splitting Link to the published article: http://dx

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N-doped titanate nanostructures on gradient surface layer of one dimensional nanofibers synthesized on Ti electrode by chemical and thermal treatments

Cited by 5 publications

References 33 publications

Preparation of a titanium metal electrode with a nitrogen-doped one-dimensional titanium oxide surface layer for the support of catalysts

Preparation of a titanium metal electrode with a nitrogen-doped one-dimensional titanium oxide surface layer for the support of catalysts

Arrays of quasi-hexagonally ordered silica nanopillars with independently controlled areal density, diameter and height gradients

Tantalum nitride nanotube photoanodes: Establishing a beneficial back-contact by lift-off and transfer to titanium nitride layer

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