热蒸发法制备TeO_2纳米线的生长机理

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TeO_2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TeO_2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TeO_2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TeO_2纳米线的生长过程进行了分析,推断TeO_2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TeO_2纳米线生长的作用.

Growth Mechanism of TeO2 Nanowires Synthesized by Thermal Evaporation Method

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 70~200nm in diameter and several hundreds of micrometers to 2mm 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.