采用水热合成技术,以钛酸丁酯、盐酸和去离子水作为前驱物,在透明导电玻璃(FTO)衬底上合成了垂直于衬底牛长的二氧化钛(TiO2)纳米线束阵列.纳米线束呈四方柱状结构,宽度100～200nm,长度约3μm.HRTEM表明每根纳米线束实际上是由20～40根直径约为4～6 nm的细小纳米线聚集在一起而形成的.系统研究了盐酸浓度对纳米线生长的影响,分析了盐酸在晶体生长中的作用.研究了TiO2纳米线束阵列的场致电子发射特性,其场发射开启电场为5.7 V/ μm(对应电流密度10μA/ cm2),阈值电场为9.5 V/ μm,同时表现出较好的场发射稳定性.低的合成温度和好的场发射性能表明TiO2纳米线束阵列在场发射冷阴极器件上具有良好的应用前景.
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