Adachi Motonari, Murata Yusuke, Takao Jun, Jiu Jinting, Sakamoto Masaru, Wang Fumin
Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan.
J Am Chem Soc. 2004 Nov 17;126(45):14943-9. doi: 10.1021/ja048068s.
In this study, single-crystal-like anatase TiO(2) nanowires were formed in a network structure by surfactant-assisted self-assembling processes at low temperature. The crystal lattice planes of the nanowires and networks of such wires composed of many nanoparticles were almost perfectly aligned with each other due to the "oriented attachment" mechanism, resulting in the high rate of electron transfer through the TiO(2) nanonetwork with single-crystal-like anatase nanowires. The direction of crystal growth of oriented attachment was controlled by changing the mole ratio of acetylacetone to Ti, that is, regulating both the adsorption of surfactant molecules via control of the reaction rate and the surface energy. A single-crystalline anatase exposing mainly the [101] plane has been prepared, which adsorbed ruthenium dye over 4 times higher as compared to P-25. A high light-to-electricity conversion yield of 9.3% was achieved by applying the titania nanomaterials with network structure as the titania thin film of dye-sensitized solar cells.
在本研究中，通过表面活性剂辅助的低温自组装过程，在网络结构中形成了单晶状锐钛矿TiO₂纳米线。由于“定向附着”机制，纳米线的晶格平面以及由许多纳米颗粒组成的此类线的网络几乎完美地彼此对齐，从而导致通过具有单晶状锐钛矿纳米线的TiO₂纳米网络的电子转移速率很高。通过改变乙酰丙酮与钛的摩尔比来控制定向附着的晶体生长方向，即通过控制反应速率和表面能来调节表面活性剂分子的吸附。制备了主要暴露[101]面的单晶锐钛矿，其对钌染料的吸附量比P-25高4倍以上。通过将具有网络结构的二氧化钛纳米材料用作染料敏化太阳能电池的二氧化钛薄膜，实现了9.3%的高光电转换产率。
