纳米TiO2/CdSe量子点的制备及其结构表征
Preparation and Structural Characterization of CdSe Quantum Dots Doped TiO2 Nanocomposites
摘 要
用水热方法制备了CdSe量子点(CdSe QDs)并通过溶胶-凝胶法制备了量子点掺杂改性的纳米TiO2复合物。运用多种方法对此复合物进行表征,并对其光催化性能进行研究。结果表明:① 在其制备焙烧过程中,CdSe QDs已掺杂进入TiO2纳米颗粒中形成纳米复合物;② CdSe QDs的引入增强了TiO2的吸光性,改善了TiO2在可见光区的吸光效率;③ TiO2的原始晶体结构在焙烧过程中发生变化,形成了两种晶相的混晶,有利于其光催化活性的改善;此外纳米TiO2复合物的表面电子结构以及吸附性能等对其光催化作用也有协同作用,使其催化性能进一步提高。
CdSe量子点
掺杂
表征
Nanoparticles of TiO2
CdSe quantum dots
Doping
Characterization
Abstract
Cadmium-selenide quantum dots (CdSe QDs) were prepared by the hydrothermal method, and the CdSe QDs were doped in nano-TiO2 by the sol-gel method. Photo-catalytic property and micro-structure of the nano-composite were studied and characterized by various methods. It was shown that: ① CdSe QDs were doped and enters into nanoparticles of TiO2 during calcination in its prepartion to form nanocomposite;② the photo-absorptivity of TiO2 was enhanced, and its photoabsorption capacity in the visible region was improved;③ inherent crystal structure of TiO2 was transformed into mixed crystal structure of 2 crystal-phases during the calcination process, and this phenomenon was believed to be beneficial to improve its activity of photo-catalysis. In addition, the photocatalytic property of the nanocomposite was improved further by the synergetic action of the surface-electronic structure and the adsorptivity capacity of the nano-composite.
中图分类号 O657
所属栏目 试验与研究
基金项目 国家科技部973计划(2009CB939705);国家自然科学基金青年基金项目(11405050,8100704);湖北省教育厅重点项目(D20142804);国家级大学生创业训练和创业实践项目(201310927023,201210927033);湖北科技学院专项基金(ZX1022,ZX1102,PY1103,BK1103,ZX1203)
收稿日期 2013/11/17
修改稿日期
网络出版日期
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备注李月生(1979-),男,湖北鄂州人,副教授,博士,主要从事功能材料及其性能研究。
引用该论文: LI Yue-sheng,GUO Qian-rui,SUN Shao-fa,ZHAO Long. Preparation and Structural Characterization of CdSe Quantum Dots Doped TiO2 Nanocomposites[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2014, 50(11): 1329～1337
李月生,郭倩蕤,孙绍发,赵龙. 纳米TiO2/CdSe量子点的制备及其结构表征[J]. 理化检验－化学分册, 2014, 50(11): 1329～1337
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【2】KIM J Y, CHOI S B, HONG K S. Surfactant-assisted shape evolution of thermally synthesized TiO2 nanocrystals and their applications to efficient photoelectrodes［J］. Langmuir, 2009,25(9):5348-5351.
【3】ROBEL I, SUBRAMANIAN V, KUNO M, et al. Quantum dot solar cells. Harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic TiO2 films［J］. J Am Chem Soc, 2006,128:2385-2393.
【4】MORA-SERO I, LIKODIMOS V, GIMNEZ S, et al. Fast regeneration of CdSe quantum dots by Ru dye in sensitized TiO2 electrodes［J］. J Phys Chem C, 2010,114:6755-6761.
【5】LESCHKIES K S, DIVAKAR R, BASU J, et al. Photosensitization of ZnO nanowires with CdSe quantum dots for photovoltaic devices［J］. Nano Lett, 2007,7:1793-1798.
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【8】LI Gui-sheng, ZHANG Die-qing, YU J C. A new visible-light photocatalyst: CdS quantum dots embedded mesoporous TiO2［J］. Environ Sci Technol, 2009,43:7079-7085.
【9】YU J C, WU Ling, LIN Jun, et al. Microemulsion-mediated solvothermal synthesis of nanosized CdS-sensitized TiO2 crystalline photocatalyst［J］. Chem Commun, 2003,13:1552-1553.
【10】HO W K, YU J C. Sonochemical synthesis and visible light photocatalytic behavior of CdSe and CdSe/TiO2 nanoparticles［J］. J Molecu Catal A: Chemical, 2006,247:268-274.
【11】SUN Wen-tao, YU Yuan, PAN Hua-yong, et al. CdS quantum dots sensitized TiO2 nanotube-array photoelectrodes［J］. J Am Chem Soc, 2008,130(4):1124-1125.
【12】BANERJEE S, MOHAPATRA S K, DAS P P, et al. Synthesis of coupled semiconductor by filling 1D TiO2 nanotubes with CdS［J］. Chem Mater, 2008,20:6784-6791.
【13】FAN S Q, KIM D, KIM J J, et al. Highly efficient CdSe quantum-dot-sensitized TiO2 photoelectrodes for solar cell applications［J］. Electrochem Commun, 2009,11:1337-1339.
【14】JIN Sheng-ye, LIAN Tian-quan. Electron transfer dynamics from single CdSe/ZnS quantum dots to TiO2 nanoparticles［J］. Nano Lett, 2009,9:2448-2454.
【15】SAMBUR J B, PARKINSON B A. CdSe/ZnS core/shell quantum dot sensitization of low index TiO2 single crystal surfaces［J］. J Am Chem Soc, 2010,132:2130-2131.
【16】SEABOLD J A, KARTHIK S, RUDEGER H T. Photoelectrochemical properties of heterojunction CdTe/TiO2 electrodes constructed using highly ordered TiO2 nanotube arrays［J］. Chem Mater, 2008,20(16):5266-5273.
【17】PRIYAM A, CHATTERJEE A, BHATTACHARYA S C, et al. Conformation and activity dependent interaction of glucose oxidase with CdTe quantum dots: towards developing a nanoparticle based enzymatic assay［J］. Photochem Photobiol Sci, 2009,8(3):362-370.
【18】YANG Chun-hao, HUANG Ke-sheng, LIN Ye-shen, et al. Microfluidic assisted synthesis of multi-functional polycaprolactone microcapsules: incorporation of CdTe quantum dots, Fe3O4 superparamagnetic nanoparticles and tamoxifen anticancer drugs［J］. Lab Chip, 2009,9:961-965.
【19】SUGIURA S, ODA T, AOYAGI Y, et al. Tubular gel fabrication and cell encapsulation in laminar flow stream formed by microfabricated nozzle array［J］. Lab Chip, 2008,8:1255-1257.
【20】KIM S H, JEON S J, YI G R, et al. Optofluidic assembly of colloidal photonic crystals with controlled sizes, shapes and structures［J］. Adv Mater, 2008,20:1649-1655.
【21】ABRAHAM S, PARK Y H, LEE J K, et al. Microfluidic synthesis of reversibly swelling porous polymeric microcapsules with controlled morphology［J］. Adv Mater, 2008,20:2177-2182.
【22】YU W W, QU Lian-hua, GUO Wen-zhuo, et al. Experimental determination of the extinction coefficient of CdTe, CdSe, and CdS nanocrystals［J］. Chem Mater, 2003,15:2854-2860.
【23】YU W W, QU Lian-hua, GUO Wen-zhuo, et al. Formation and stability of size-, shape-, and structure-controlled CdTe nanocrystals: ligand effects on monomers and nanocrystals［J］. Chem Mater, 2003,15:4300-4308.
【24】TANG Hong-wu, LUO Mei-na, XIONG Yong-pan, et al. High-resolution Hadamard transform microscope fluorescence imaging: quantifying the DNA content in single cells［J］. Anal Bioanal Chem, 2005,381:901-906.
【25】TANG Hong-wu, CHEN Guo-quan, ZHOU Jin-song, et al. Hadamard transform fluorescence image microscopy using one-dimensional movable mask［J］. Anal Chim Acta, 2002,468:27-34.
【26】LIN Han, HUANG Chen-pin, LI Wei, et al. Size dependency of nanocrystalline TiO2 on its optical property and photocatalytic reactivity examplified by 2-chlorophenol［J］. Appl Catal B: Environ, 2006,68:1-11.
【27】ZHANG Ke-lin, LIU Chen-ming, HUANG Fu-qiang, et al. Study of the electronic structure and photocatalytic activity of the BiOCl photocatalyst［J］. Appl Catal B: Environ, 2006,68:125-130.
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【31】LI He-xing, ZHANG Xin-yu, HUO Yun-jing, et al. Supercritical preparation of a highly active S-doped TiO2 photocatalyst for methylene blue mineralization［J］. Environ Sci Technol, 2007,41:4410-4414.
【32】CHHOR K, BOCQUENT J F, POMMIER C. Syntheses of submicron TiO2 powders in vapor, liquid and supercritical phases, a comparative study［J］. Mater Chem Phys, 1992,32:249-253.
【33】URLAUB R, POSSET U, THULL R F T. FT-IR spectroscopic investigations on sol-gel-derived coatings from acid-modified titanium alkoxides［J］. J Non-Cryst Solids, 2000,265:276-279.
【34】SILVERSTEIN R M, BASSLER G C, MORRILL T C. Spectrometric identification of organic compounds［C］. 4 Ed. New York: John Wiley and Sons, 1981.
【35】YUAN Jian, CHEN Ming-xia, SHI Jian-wei, et al. Preparations and photocatalytic hydrogen evolution of N-doped TiO2 from urea and titanium tetrachloride［J］. J Hydrogen Energy, 2006,31:1326-1331.
【36】OHNO T, AKIYOSHI M, UMEBAYASHI T, et al. Preparation of S-doped TiO2 photocatalysts and their photocatalytic activities under visible light［J］. Appl Catal A: Gen, 2004,265:115-121.
【37】ETCHBERRY A, IRANZO-MARIN F, NOVAKOVIC E, et al. Contribution to the understanding of the CdTe and Cd1-yZnyTe surface chemistry［J］. J Cryst Growth, 1998,184/185:213-217.
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