退火对TiO_2纳米管/线复合阵列表面光电性质的影响  

Effects of Annealing on the Surface Photoelectronic Properties of TiO_2 Nanotube/Nanowire Composite Arrays

作　　者：杨峰[1] 蔡芳共[1] 柯川[1] 赵勇[1,2] 程翠华[1,2] 

机构地区：[1]西南交通大学超导与新能源研究开发中心材料先进技术教育部重点实验室,成都610031 [2]新南威尔士大学材料科学与工程学院

出　　处：《高等学校化学学报》2011年第11期2581-2585,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50588201;50872116);中央高校基本科研业务费专项资金(批准号:2009QK46;SWJTU09ZT24)资助

摘　　要：采用阳极氧化法制备了TiO2纳米管/线复合阵列.利用表面光电压谱(SPS)和场诱导表面光电压谱(FISPS)研究了退火对TiO2纳米管/线复合阵列表面光电性质的影响.结果表明,TiO2纳米管/线复合阵列在晶化前后的导带边缘均出现了束缚激子态,晶化前由于自建场较弱,束缚激子态能在正负电场作用下发生不对称偏转;晶化后,晶体结构从非晶态变为晶态,自建场增强,束缚激子态对正电场敏感并表现出明显的光伏响应,而在负电场作用下束缚激子态没有任何光伏响应.TiO2 nanotube/nanowire composite arrays were fabricated on the Ti substrate via anodic oxidation method. Annealing effects on the surface photoelectronie properties of TiO2 nanotube/nanowire composite arrays were studied by surface photovohage spectrum （SPS） and the electrical field induced surface photovoltage spectrum（FISPS）. The results show that the bound exeitons exist at the edge of conduction band both in asprepared and annealed TiO2 nanotube/nanowire composite arrays. The build-in field in as-prepared TiO2 nanotube/nanowire composite arrays is weak and the bound excitons can inverse antisymmetrically under external field. After being annealed, TiO2 nanotube/nanowire composite arrays were crystallized from amorphous structure, the build-in field is increased, but the SPS responses related to the bound exeitons could exhibit only under positive field.

关 键 词：表面光伏 场诱导表面光电压谱 TiO2纳米管/线复合阵列 束缚激子 

分 类 号：O649[理学—物理化学]