The quenching of CdSe quantum dots photoluminescence by gold nanoparticles in solution
作者： Babak Nikoobakht , Clemens Burda , Markus Braun , Man Hun , Mostafa A. El-Sayed
DOI: 10.1562/0031-8655(2002)075<0591:TQOCQD>2.0.CO;2
关键词: Analytical chemistry 、 Photoluminescence 、 Luminescence 、 Fermi level 、 Electron transfer 、 Quantum dot 、 Colloidal gold 、 Quenching (fluorescence) 、 Photochemistry 、 Materials science 、 Nanorod
摘要: The photoluminescence (PL) of CdSe quantum dots (QD) in aqueous media has been studied the presence gold nanoparticles (NP) with different shapes. steady state PL intensity QD (1.5-2 nm size) is quenched NP. Picosecond bleach recovery and nanosecond time-resolved luminescence measurements show a faster decrease lifetime emitting states quenchers. Surfactant-capped nanorods (NR) aspect ratio 3 surfactant-capped citrate-capped nanospheres (NS) 12 diameter were used as quenchers order to study effect shape surface charge on quenching rates. Stern-Volmer kinetics model examine observed behavior function quencher concentration. It was found that rate NR more than 1000 times stronger NS same capping material. We also decreases length decreases, although overlap between emission absorption increases. This suggests result electron transfer rather long-range (Forster-type) energy processes. attributed energies below Fermi level trap holes QD. large difference efficiencies [110] facets only NR, which have higher energy.
eurekamag.com参考文章(25)
D.J. Fabian, S.B.M. Hagstroem, X-ray photoelectron spectroscopy in the study of the band structure of metals Academic Press Inc., London. ,(1973)
I. A. Schmidt, D. Boyanovsky, R. Blankenbecler, Is the chiral angle related to the vacuum charge\? A study in one dimension Physical Review D. ,vol. 33, pp. 1088- 1093 ,(1986) , 10.1103/PHYSREVD.33.1088
Z. L. Wang, R. P. Gao, B. Nikoobakht, M. A. El-Sayed, Surface Reconstruction of the Unstable {110} Surface in Gold Nanorods Journal of Physical Chemistry B. ,vol. 104, pp. 5417- 5420 ,(2000) , 10.1021/JP000800W
Arthur H. Nethercot, Prediction of Fermi Energies and Photoelectric Thresholds Based on Electronegativity Concepts Physical Review Letters. ,vol. 33, pp. 1088- 1091 ,(1974) , 10.1103/PHYSREVLETT.33.1088
L. E. Brus, A simple model for the ionization potential, electron affinity, and aqueous redox potentials of small semiconductor crystallites The Journal of Chemical Physics. ,vol. 79, pp. 5566- 5571 ,(1983) , 10.1063/1.445676
E Lifshitz, I Dag, I Litvin, G Hodes, S Gorer, R Reisfeld, M Zelner, H Minti, Optical properties of CdSe nanoparticle films prepared by chemical deposition and sol–gel methods Chemical Physics Letters. ,vol. 288, pp. 188- 196 ,(1998) , 10.1016/S0009-2614(98)00283-8
N. Chestnoy, T. D. Harris, R. Hull, L. E. Brus, Luminescence and photophysics of cadmium sulfide semiconductor clusters: the nature of the emitting electronic state The Journal of Physical Chemistry. ,vol. 90, pp. 3393- 3399 ,(1986) , 10.1021/J100406A018
F. H. Field, Fast atom bombardment study of glycerol: mass spectra and radiation chemistry The Journal of Physical Chemistry. ,vol. 86, pp. 172- 172 ,(1982) , 10.1021/J100223A013
Hiroaki Tada, Kazuaki Teranishi, Yo-ichi Inubushi, Seishiro Ito, Ag Nanocluster Loading Effect on TiO2 Photocatalytic Reduction of Bis(2-dipyridyl)disulfide to 2-Mercaptopyridine by H2O Langmuir. ,vol. 16, pp. 3304- 3309 ,(2000) , 10.1021/LA991315Z
Janos H. Fendler, Photochemical solar energy conversion. An assessment of scientific accomplishments The Journal of Physical Chemistry. ,vol. 89, pp. 2730- 2740 ,(1985) , 10.1021/J100259A006