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Structural Evolution of Chemically-Driven RuO2 Nanowires and 3-Dimensional Design for Photo-Catalytic Applications.

Park J, Lee JW, Ye BU, Chun SH, Joo SH, Park H, Lee H, Jeong HY, Kim MH, Baik JM - Sci Rep (2015)

Bottom Line: Growth then proceeds by Ru diffusion to the nanoparticles, followed by the diffusion to the growing surface of the nanowire in oxygen ambient, supported by the nucleation theory.The RuO2 branched Au-TiO2 nanowire arrays shows a remarkable enhancement in the photocurrent density by approximately 60% and 200%, in the UV-visible and Visible region, respectively, compared with pristine TiO2 nanowires.Furthermore, there is no significant decrease in the device's photoconductance with UV-visible illumination during 1 day, making it possible to produce oxygen gas without the loss of the photoactvity.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.

ABSTRACT
Growth mechanism of chemically-driven RuO2 nanowires is explored and used to fabricate three-dimensional RuO2 branched Au-TiO2 nanowire electrodes for the photostable solar water oxidation. For the real time structural evolution during the nanowire growth, the amorphous RuO2 precursors (Ru(OH)3 · H2O) are heated at 180 (°)C, producing the RuO2 nanoparticles with the tetragonal crystallographic structure and Ru enriched amorphous phases, observed through the in-situ synchrotron x-ray diffraction and the high-resolution transmission electron microscope images. Growth then proceeds by Ru diffusion to the nanoparticles, followed by the diffusion to the growing surface of the nanowire in oxygen ambient, supported by the nucleation theory. The RuO2 branched Au-TiO2 nanowire arrays shows a remarkable enhancement in the photocurrent density by approximately 60% and 200%, in the UV-visible and Visible region, respectively, compared with pristine TiO2 nanowires. Furthermore, there is no significant decrease in the device's photoconductance with UV-visible illumination during 1 day, making it possible to produce oxygen gas without the loss of the photoactvity.

No MeSH data available.


Related in: MedlinePlus

(a) Schematic diagram for the fabrication of RuO2 nanowires and 3D RuO2 branched Au-TiO2 nanostructure, (b,c) top-view SEM images of RuO2 nanowires and 3D branched nanostructures (scale bars in the left and right images, 1 μm and 100 nm, respectively).
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f1: (a) Schematic diagram for the fabrication of RuO2 nanowires and 3D RuO2 branched Au-TiO2 nanostructure, (b,c) top-view SEM images of RuO2 nanowires and 3D branched nanostructures (scale bars in the left and right images, 1 μm and 100 nm, respectively).

Mentions: The schematic diagrams outlining the fabrication process of 1D RuO2 nanowires and 3D RuO2 branched Au-TiO2 nanowires are shown in Fig. 1a and detailed information described in Experimental section. Scanning electron microscopy (SEM) images in Fig. 1b shows the product (of a reaction carried out at 250 °C) to consist of long, randomly oriented RuO2 nanowires without any catalyst particles at the end of their tips. The nanowires (0.5 ~ 1 μm long and 130 ~ 170 nm in diameter) grow out of the plane of the substrate in the rectangular shape. Figure 1c shows RuO2 nanowires directly grown on hydrothermally-grown TiO2 nanowires with Au nanoparticles (AuNPs), producing 3D branched nanowires. The lengths of most of the nanowires fall in the range 60 ~ 80 nm. The mean nanowire width was determined to be 25 nm. The smaller RuO2 nanowires in the 3D branched structures ascribes to the decrease in the amount of the precursor, which is an important factor in determining the length and width of the nanowires.


Structural Evolution of Chemically-Driven RuO2 Nanowires and 3-Dimensional Design for Photo-Catalytic Applications.

Park J, Lee JW, Ye BU, Chun SH, Joo SH, Park H, Lee H, Jeong HY, Kim MH, Baik JM - Sci Rep (2015)

(a) Schematic diagram for the fabrication of RuO2 nanowires and 3D RuO2 branched Au-TiO2 nanostructure, (b,c) top-view SEM images of RuO2 nanowires and 3D branched nanostructures (scale bars in the left and right images, 1 μm and 100 nm, respectively).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493639&req=5

f1: (a) Schematic diagram for the fabrication of RuO2 nanowires and 3D RuO2 branched Au-TiO2 nanostructure, (b,c) top-view SEM images of RuO2 nanowires and 3D branched nanostructures (scale bars in the left and right images, 1 μm and 100 nm, respectively).
Mentions: The schematic diagrams outlining the fabrication process of 1D RuO2 nanowires and 3D RuO2 branched Au-TiO2 nanowires are shown in Fig. 1a and detailed information described in Experimental section. Scanning electron microscopy (SEM) images in Fig. 1b shows the product (of a reaction carried out at 250 °C) to consist of long, randomly oriented RuO2 nanowires without any catalyst particles at the end of their tips. The nanowires (0.5 ~ 1 μm long and 130 ~ 170 nm in diameter) grow out of the plane of the substrate in the rectangular shape. Figure 1c shows RuO2 nanowires directly grown on hydrothermally-grown TiO2 nanowires with Au nanoparticles (AuNPs), producing 3D branched nanowires. The lengths of most of the nanowires fall in the range 60 ~ 80 nm. The mean nanowire width was determined to be 25 nm. The smaller RuO2 nanowires in the 3D branched structures ascribes to the decrease in the amount of the precursor, which is an important factor in determining the length and width of the nanowires.

Bottom Line: Growth then proceeds by Ru diffusion to the nanoparticles, followed by the diffusion to the growing surface of the nanowire in oxygen ambient, supported by the nucleation theory.The RuO2 branched Au-TiO2 nanowire arrays shows a remarkable enhancement in the photocurrent density by approximately 60% and 200%, in the UV-visible and Visible region, respectively, compared with pristine TiO2 nanowires.Furthermore, there is no significant decrease in the device's photoconductance with UV-visible illumination during 1 day, making it possible to produce oxygen gas without the loss of the photoactvity.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, KIST-UNIST-Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.

ABSTRACT
Growth mechanism of chemically-driven RuO2 nanowires is explored and used to fabricate three-dimensional RuO2 branched Au-TiO2 nanowire electrodes for the photostable solar water oxidation. For the real time structural evolution during the nanowire growth, the amorphous RuO2 precursors (Ru(OH)3 · H2O) are heated at 180 (°)C, producing the RuO2 nanoparticles with the tetragonal crystallographic structure and Ru enriched amorphous phases, observed through the in-situ synchrotron x-ray diffraction and the high-resolution transmission electron microscope images. Growth then proceeds by Ru diffusion to the nanoparticles, followed by the diffusion to the growing surface of the nanowire in oxygen ambient, supported by the nucleation theory. The RuO2 branched Au-TiO2 nanowire arrays shows a remarkable enhancement in the photocurrent density by approximately 60% and 200%, in the UV-visible and Visible region, respectively, compared with pristine TiO2 nanowires. Furthermore, there is no significant decrease in the device's photoconductance with UV-visible illumination during 1 day, making it possible to produce oxygen gas without the loss of the photoactvity.

No MeSH data available.


Related in: MedlinePlus