In the present work, we synthesize nano-sized ZnO, SnO2, and TiO2 powders by hydrothermal reaction using metal chlorides. We also examine the energy-storage characteristics of the resulting materials to evaluate the potential application of these powders to dye-sensitized solar cells. The control of processing parameters such as pressure, temperature, and the concentration of aqueous solution results in the formation of a variety of powder morphologies with different sizes. Nano-rod, nano-flower, and spherical powders are easily formed with the present method. Heat treatment after the hydrothermal reaction usually increases the size of the powder. At temperatures above 1000oC, a complete collapse of the shape occurs. With regard to the capacity of DSSC materials, the hydrothermally synthesized TiO2 results in the highest current density of 9.1 mA/cm² among the examined oxides. This is attributed to the fine particle size and morphology with large specific surface area.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 3.1. 수열반응에 의한 분말 형상의 변화
 3.2. 수열합성 분말의 후열처리 영향
 3.3. 수열합성 분말의 광 전극 특성 및 DSSC 효율
 4. 결 론
 References

• 임진영(안동대학교 신소재공학부) | JinYoung Lim (School of Advanced Materials Engineering, Andong National University)
• 안정석(안동대학교 신소재공학부) | Jeongseok Ahn (School of Advanced Materials Engineering, Andong National University)
• 안중호(안동대학교 신소재공학부) | Jung-Ho Ahn (School of Advanced Materials Engineering, Andong National University) Corresponding Author