作　　者： ; ; ; ; ;

机构地区： 四川大学化学工程学院

出　　处： 《无机化学学报》 2009年第6期1031-1037,共7页

摘　　要： 以价廉的Ni板代替常用的Pt片为阴极,纯钛为阳极,采用电化学阳极氧化法在NH4F-H3PO4体系中制备出TiO2纳米管阵列。详细研究了制备参数(溶液酸度、氟离子浓度、外加电压和氧化时间)对所获纳米管阵列形貌的影响。采用场发射扫描电镜(FE-SEM)和X射线衍射(XRD)对样品的形貌和晶相结构进行了表征。在最优化的条件下,可以获得形貌规整、表面干净、有序的TiO2纳米管阵列。纳米管阵列的平均管径为60nm,管长约530nm。采用阳极氧化法制备的纳米管阵列是非晶态的,经400℃热处理2h后,可以转变为锐钛矿相。实验结果还发现,经过热处理后,纳米管阵列变得更为有序,管径扩大至约95nm。 TiO2 nanotube arrays were fabricated by anodization of titanium in aqueous electrolyte solution of NH4F＋ H3PO4 using a Nickel sheet of low cost as cathode instead of conventionally used noble Platinum. The effects of preparation parameters, i.e., concentration of H3PO4 and F-, applied voltage and anodization time, on the morphology of as-prepared nanotube arrays were systematically studied. Field emission scanning electron microscope（FE-SEM） and X-ray diffraction（XRD） analysis were carried out to characterize the morphology and structure of the samples. The results showed that the self-ordered TiO2 nanotube arrays with an average pore size of 60 nm and a length of 530 nm could be obtained under optimum conditions. The as-prepared nanotube arrays were amorphous and transformed to an anatase crystal structure after being annealed at 400 ℃ for 2 h. It was also found that the freshlyprepared nanotube arrays got more ordered after calcination, with a pore size of ca. 95 nm.

关 键 词： 纳米管阵列 阴极 电化学阳极氧化

领　　域： [理学] [理学]