Phase and Shape Transformation of Sodium Titanate and Tin Oxide Composite Nanowires by TiO2 nanobranches

다국어 초록 (Multilingual Abstract)

Composite nanowires (NWs) mainly consisted of tin oxide (SnO2) and sodium titanate wereprepared by the facile hydrothermal method. In this way, the composite crystalline phase was changed tomainly TiO2, and 1-dimensional (1-D) NWs were modified by the deposition of nano-branches to formflower-shaped NWs. The photo-electrochemical properties of both kinds of NW electrodes were tested byfabricating dye-sensitized solar cells (DSSCs). This revealed that the composite NWs exhibited a very lowefficiency of 0.011% as a result of sodium titanate insulating the SnO2 photo-electrode. However, the nanobranchedNWs exhibited an enhanced conversion efficiency of 0.8%, which is attributed to phase transformationto photoactive TiO2, and to the substantial dye uptake made possible by the large surface area available.
Accordingly, the nano-branched NWs were prepared using phase and structural transformation ofcomposite NWs and that showed more than 15-fold enhancement of the photo-conversion efficiency.

참고문헌 (Reference)

1 J. Wang, 22 : 8327-, 2012

2 A. N. Green, 109 : 12525-, 2005

3 M. R. Hoffmann, 95 : 69-, 1995

4 Y. Yu, 289 : 186-, 2005

5 A. D. Paola, 211 : 3-, 2012

6 K. Liu, 6 : 7209-, 2012

7 X. Liu, 1 : 329-, 2013

8 T. Yan, 2012 : 1-, 2012

9 Y. Li, 37 : 1-, 2012

10 B. Liu, 19 : 505604-, 2008

11 S. H. Kang, 20 : 54-, 2008

12 L. E. Greene, 5 : 1231-, 2005

13 S. Ahmed, 1 : 879-, 2011

14 J. Liu, 19 : 1859-, 2009

15 S. Chappel, 71 : 141-, 2002

16 최순옥, "황산법을 이용한 루틸형 TiO_2 분말의 제조 및 특성 평가" 대한금속·재료학회 50 (50): 523-530, 2012

17 강순형, "Synthesis of nanobranched TiO2 nanotubes and their application to dye-sensitized solar cell" 한국물리학회 13 (13): 252-255, 2013