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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) TEM image of RuO2 nanowire on Au nanoparticle-decorated TiO2 nanowire. It is clearly seen that the nanowire is grown on the Au nanoparticle (scale bar 20 nm). (b) High-angle annular dark field (HAADF) scanning TEM image of 3D branched nanowires. EDS elemental distribution map of Ru, Au, and Ti (scale bar 100 nm).
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f4: (a) TEM image of RuO2 nanowire on Au nanoparticle-decorated TiO2 nanowire. It is clearly seen that the nanowire is grown on the Au nanoparticle (scale bar 20 nm). (b) High-angle annular dark field (HAADF) scanning TEM image of 3D branched nanowires. EDS elemental distribution map of Ru, Au, and Ti (scale bar 100 nm).

Mentions: The RuO2 nanowires were successfully grown on the Au-decorated TiO2 nanowires, by precisely controlling the concentration of precursors and the growth temperature. HRTEM image in Fig. 4a shows that single-crystalline RuO2 nanowire is directly grown on the Au nanoparticle. EDS elemental mapping of Fig. 4b clearly also confirms each elemental distribution.


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) TEM image of RuO2 nanowire on Au nanoparticle-decorated TiO2 nanowire. It is clearly seen that the nanowire is grown on the Au nanoparticle (scale bar 20 nm). (b) High-angle annular dark field (HAADF) scanning TEM image of 3D branched nanowires. EDS elemental distribution map of Ru, Au, and Ti (scale bar 100 nm).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: (a) TEM image of RuO2 nanowire on Au nanoparticle-decorated TiO2 nanowire. It is clearly seen that the nanowire is grown on the Au nanoparticle (scale bar 20 nm). (b) High-angle annular dark field (HAADF) scanning TEM image of 3D branched nanowires. EDS elemental distribution map of Ru, Au, and Ti (scale bar 100 nm).
Mentions: The RuO2 nanowires were successfully grown on the Au-decorated TiO2 nanowires, by precisely controlling the concentration of precursors and the growth temperature. HRTEM image in Fig. 4a shows that single-crystalline RuO2 nanowire is directly grown on the Au nanoparticle. EDS elemental mapping of Fig. 4b clearly also confirms each elemental distribution.

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