Interfacial Electron Transfer from CdSe/ZnS Quantum Dots to TiO2 Nanoparticles: Size Dependence at the Single-Molecule Level
作者： Chun-Li Chang , Po-Yu Tsai , Yu-pin Chang , King-Chuen Lin
关键词: Electron transfer 、 Thin film 、 Reaction rate constant 、 Marcus theory 、 Molecule 、 Nanoparticle 、 Analytical chemistry 、 Fluorescence 、 Quantum dot 、 Chemistry 、 Molecular physics
摘要: Electron transfer (ET) kinetics of CdSe/ZnS core/shell quantum dots (QDs) on bare coverslips and a TiO(2) nanoparticle-coated thin film has been investigated at the single-molecule level. The QDs prepared have three different diameters 3.6, 4.6, 6.4 nm. trajectories fluorescence intensity are acquired with respect to arrival time. on-time events subsequent lifetimes shorter decreasing size. Given lifetime measurements for glass TiO(2), rate constant ET from may be determined 1.3×10(7), 6.0×10(6), 4.7×10(6) s(-1) increasing sizes QDs. plot probability density versus time is characterized by power-law statistics in short region bending tail long region. Marcus's model employed satisfactorily fit behavior further calculate constants. theoretical counterparts 1.4×10(7), 6.4×10(6), 1.9×10(6) s(-1), showing good agreement experimental results.
sci-hub.se 参考文章(72)
Wen-Tao Sun, Yuan Yu, Hua-Yong Pan, Xian-Feng Gao, Qing Chen, Lian-Mao Peng, CdS quantum dots sensitized TiO2 nanotube-array photoelectrodes. Journal of the American Chemical Society. ,vol. 130, pp. 1124- 1125 ,(2008) , 10.1021/JA0777741
F. Kulzer, S. Kummer, R. Matzke, C. Bräuchle, Th. Basche´, Single-molecule optical switching of terrylene in p-terphenyl Nature. ,vol. 387, pp. 688- 691 ,(1997) , 10.1038/42674
Yuanmin Wang, Xuefei Wang, Sujit Kumar Ghosh, H. Peter Lu, Probing Single-Molecule Interfacial Electron Transfer Dynamics of Porphyrin on TiO2 Nanoparticles Journal of the American Chemical Society. ,vol. 131, pp. 1479- 1487 ,(2009) , 10.1021/JA806988D
J. B. Sambur, T. Novet, B. A. Parkinson, Multiple Exciton Collection in a Sensitized Photovoltaic System Science. ,vol. 330, pp. 63- 66 ,(2010) , 10.1126/SCIENCE.1191462
M. Kuno, D. P. Fromm, H. F. Hamann, A. Gallagher, D. J. Nesbitt, ``On''/``off'' fluorescence intermittency of single semiconductor quantum dots Journal of Chemical Physics. ,vol. 115, pp. 1028- 1040 ,(2001) , 10.1063/1.1377883
W. E. Moerner, David P. Fromm, Methods of single-molecule fluorescence spectroscopy and microscopy Review of Scientific Instruments. ,vol. 74, pp. 3597- 3619 ,(2003) , 10.1063/1.1589587
Douglas Natelson, Lam H. Yu, Jacob W. Ciszek, Zachary K. Keane, James M. Tour, Single-molecule transistors: Electron transfer in the solid state principles and practice of constraint programming. ,vol. 324, pp. 267- 275 ,(2006) , 10.1016/J.CHEMPHYS.2005.11.030
X. S. Xie, R. C. Dunn, Probing Single Molecule Dynamics Science. ,vol. 265, pp. 361- 364 ,(1994) , 10.1126/SCIENCE.265.5170.361
Brian O'Regan, Michael Grätzel, A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films Nature. ,vol. 353, pp. 737- 740 ,(1991) , 10.1038/353737A0
Joshua J Choi, Yee-Fun Lim, Mitk'El B Santiago-Berrios, Matthew Oh, Byung-Ryool Hyun, Liangfeng Sun, Adam C Bartnik, Augusta Goedhart, George G Malliaras, D Abruna, Hector, W Wise, Frank, Tobias Hanrath, PbSe nanocrystal excitonic solar cells. Nano Letters. ,vol. 9, pp. 3749- 3755 ,(2009) , 10.1021/NL901930G