实验条件对二氧化钛纳米棒形貌和光电流密度的影响(英文)

Effects of Experimental Conditions on The Morphology and Photocurrent Density of TiO_2 Nanorods

采用简单的水热合成法,以四异丙醇钛为钛源,制备出整齐有序的二氧化钛纳米棒阵列。探索了钛源浓度、反应液酸度、反应时间、温度等实验条件对纳米棒的形貌和光电流密度的影响。实验结果表明:钛源浓度和反应液酸度对纳米棒的生长有非常大的影响,最佳反应液的组分为10 mL去离子水、10 mL盐酸和0.4mL钛源。另外,随着反应时间的增加,纳米棒的长度会明显的增加,但纳米棒的直径和光电流密度却变化不大。同时,纳米棒的长度也随着反应温度的增高而增加,其光电流密度随之呈现先增大后减小的趋势,但其直径没有明显改变。

Oriented TiO2 nanorod arrays were directly synthesized on fluorine-doped tin oxide glass substrates through a hydrothermal method.Experimental results demonstrate that a number of reaction parameters including acidity,reactant concentration,growth time and reaction temperature can affect the morphology and photocurrent density of TiO2 nanorods.For example,the length of the nanorods significantly increases with the growth time or reaction temperature,while the diameter is only influenced by reaction temperature but not growth time.Photocurrent density firstly improves but then decreases with the reaction temperature,and there are no clear correlations between photocurrent density and growth time.These results will provide helpful information on the optimization of reaction parameters for the synthesis of oriented rutile TiO2 nanorods with high photoelectrical conversion efficiency for solar cell applications.