可见光响应型Cu-Ti-O纳米管阵列的阳极氧化制备及表征

Preparation and characterization of visible-light-sensitive anodic Cu-Ti-O nanotube arrays

通过阳极氧化在Cu30Ti70合金基体上制备出高度有序的Cu掺杂Cu-Ti-O纳米管阵列,并讨论了阳极氧化时间对Cu-Ti-O纳米管阵列形貌和结构影响。结果表明:在O2气氛中450℃退火晶化2 h后,Cu-Ti-O纳米管阵列在400~650 nm波长范围内表现出较强的可见光响应性能,其本征吸收带边和可见光吸收带边最大值分别红移至470nm和760nm;Cu掺杂后形成的氧空位促进了Cu-Ti-O纳米管锐钛矿向金红石相的转变;随着阳极氧化时间的延长,Cu-Ti-O纳米管阵列长度增加,管壁厚度减薄,且在O2气氛中450℃退火2 h后,金红石相转变量增加。

Well organized Cu-Ti-O nanotube arrays with enhanced visible light response were prepared on Cu30Ti70 alloy substrate by anodization. The influences of anodization time on the morphology, crystalline structure and photocatalytic activity of Cu-Ti-O nanotube arrays were further investigated. The results show that the stronger visible-light-sensitive care observed at the wavelength of 400?650 nm, the intrinsic and visible light absorption edge are red shift to about 470 nm and 760 nm, respectively. The oxygen vacancies induced by the high concentration Cu dopant into the Cu-Ti-O nanotube play a favorable role in determining anatase to rutile phase transformation. With prolonging anodization time, the Cu-Ti-O nanotube length increases while the wall thickness decreases as well as rutile phase transformation increasing after crystallization in O2 annealing at 450℃for 2 h.