(1. 深圳清華大學(xué)研究院 低碳能源與節(jié)能技術(shù)重點實驗室，深圳 518057；
2. 中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 通過陽極氧化在Cu30Ti70合金基體上制備出高度有序的Cu摻雜Cu-Ti-O納米管陣列，并討論了陽極氧化時間對Cu-Ti-O納米管陣列形貌和結(jié)構(gòu)影響。結(jié)果表明：在O2氣氛中450℃退火晶化2 h后，Cu-Ti-O納米管陣列在400~650 nm波長范圍內(nèi)表現(xiàn)出較強的可見光響應(yīng)性能，其本征吸收帶邊和可見光吸收帶邊最大值分別紅移至470 nm和760 nm；Cu摻雜后形成的氧空位促進了Cu-Ti-O納米管銳鈦礦向金紅石相的轉(zhuǎn)變；隨著陽極氧化時間的延長，Cu-Ti-O納米管陣列長度增加，管壁厚度減薄，且在O2氣氛中450 ℃退火2 h后，金紅石相轉(zhuǎn)變量增加。
關(guān)鍵字: Cu-Ti-O納米管；Cu-Ti合金；陽極氧化；可見光響應(yīng)
（1. Key Laboratory of Low-carbon Energy and Energy-saving Technology,
Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: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.
Key words: Cu-Ti-O nanotube; Cu-Ti alloy; anodization; visible-light-sensitive
