热蒸发法制备 TeO2纳米线的生长机理

摘要

以金属碲粉为原料，在450℃下采用热蒸发法在镀金玻璃基板上成功合成 TeO2纳米线，利用 X射线衍射、扫描电子显微镜、透射电子显微镜对 TeO2纳米线的结构和形貌进行表征，并对其生长机理进行探讨.研究结果表明，具有四方相晶体结构的 TeO2纳米线直径在70~200 nm 之间，长度在几百微米至2 mm.通过对不同生长时间所获得产物的形貌观察，对 TeO2纳米线的生长过程进行了分析，推断 TeO2纳米线是通过气-固机制进行生长，镀金薄膜可能只是起到诱导和加速 TeO2纳米线生长的作用.%TeO2 nanowires were synthesized on Au-coated glass substrates at 450 ℃ by thermal evaporation method using Te powders as the source material.The structures and morphology of TeO2 nanowires were characterized by X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.A possible growth mechanism was proposed.The results showed that TeO2 nanowires with a tetragonal structure were approximately 70 ~200 nm in diameter and several hundreds of micrometers to 2 mm in length.By the morphology observation of the as-prepared products obtained at different growth times,the growth process of TeO2 nanowires was analyzed.It is concluded that the growth of TeO2 nanowires is based on vapor-solid growth mechanism,where Au film deposited on the glass substrates is possibly used for inducing and accelerating the growth of TeO2 nanowires.