本文選題：氫氟酸 + 鈦基半導(dǎo)體�。� 參考：《物理化學(xué)學(xué)報(bào)》2017年10期

【摘要】：以鈦酸丁酯為鈦源,氫氟酸為氟源,采用溶劑熱法制備了一系列鈦基半導(dǎo)體納米晶,考察了氫氟酸加入量對(duì)納米晶結(jié)構(gòu)演變的影響,并通過光催化產(chǎn)氫、光降解羅丹明B及瞬態(tài)光電流響應(yīng)測(cè)試了所得納米晶的光催化性能。當(dāng)不加氫氟酸時(shí),所得納米晶為TiO_2納米顆粒,主要暴露{101}面。加入少量氫氟酸時(shí),所得納米晶為主要暴露{001}面的TiO_2納米片,這是由于氟離子吸附于納米晶表面,降低{001}面表面能所致。由于{001}面與{101}面間的晶面異質(zhì)結(jié)促進(jìn)了載流子分離,該樣品表現(xiàn)出了最高的光催化性能。繼續(xù)增加氫氟酸加入量,氟離子開始進(jìn)入晶格構(gòu)成新晶相,所得納米晶的表面與體相均形成TiO_2與TiOF_2混合相,形貌呈現(xiàn)片層堆疊結(jié)構(gòu),光催化性能下降。當(dāng)進(jìn)一步增加氫氟酸加入量后,氟離子全部進(jìn)入晶格形成大顆粒(NH_4)_(0.3)TiO_(1.1)F_(2.1)。因其具有不適宜光催化反應(yīng)的能帶結(jié)構(gòu),該物質(zhì)表現(xiàn)出了較差的光催化活性,但其可作為制備氮、氟摻雜鈦基半導(dǎo)體材料的前驅(qū)體使用。
[Abstract]:A series of titanium based semiconductor nanocrystals were prepared by solvothermal method using butyl titanate as titanium source and hydrofluoric acid as fluorine source. The effect of the amount of hydrofluoric acid on the evolution of nanocrystalline structure was investigated. Photodegradation of Rhodamine B and transient photocurrent response were used to determine the photocatalytic properties of the nanocrystals. When hydrofluoric acid is not added, the resulting nanocrystals are TiO-2 nanoparticles, mainly exposed to {101} plane. When a small amount of hydrofluoric acid was added, the obtained nanocrystals were TiO2 nanoparticles which mainly exposed {001} surface, which was caused by fluoride ion adsorbing on the surface of nanocrystalline and reducing the surface energy of {001} surface. Because the heterojunction between {001} plane and {101} plane promotes carrier separation, the sample exhibits the highest photocatalytic performance. With increasing the amount of hydrofluoric acid, fluorine ions began to enter the lattice to form a new crystal phase. Both the surface and bulk phases of the nanocrystals were mixed with TiOStack _ 2 and TiOF _ 2. The morphology of the nanocrystals presented lamellar stacking structure and the photocatalytic performance decreased. When the amount of hydrofluoric acid was further increased, fluorine ions all entered the lattice to form large particles (NH _ 4) _ (0.3) TIO _ (1.1) F _ (2.1). Because of its unsuitable band structure for photocatalytic reaction, the compound exhibits poor photocatalytic activity, but it can be used as a precursor for the preparation of nitrogen and fluorine-doped titanium based semiconductor materials.
【作者單位】： 天津大學(xué)化工學(xué)院天津化學(xué)化工協(xié)同創(chuàng)新中心天津市應(yīng)用催化科學(xué)與工程重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(21476159) 天津市自然科學(xué)基金(15JCZDJC37400,15JCYBJC23000)資助項(xiàng)目~~
【分類號(hào)】：O643.36;O644.1

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