@article {Chen20109050,
	title = {Photoinduced electron transfer of oxazine 1/TiO2 nanoparticles at single molecule level by using confocal fluorescence microscopy},
	journal = {Langmuir},
	volume = {26},
	number = {11},
	year = {2010},
	note = {<p>cited By 6</p>
},
	pages = {9050-9060},
	abstract = {<p>Kinetics of photoinduced electron transfer (ET) from oxazine 1 dye to TiO2 nanoparticles (NPs) surface is studied at a single molecule level by using confocal fluorescence microscopy. Upon irradiation with a pulsed laser at 630 nm, the fluorescence lifetimes sampled among 100 different dye molecules are determined to yield an average lifetime of 2.9 {\textpm} 0.3 ns, which is close to the value of 3.0 {\textpm} 0.6 ns measured on the bare coverslip. The lifetime proximity suggests that most interfacial electron transfer (IFET) processes for the current system are inefficient, probably caused by physisorption between dye and the TiO2 film. However, there might exist some molecules which are quenched before fluorescing and fail to be detected. With the aid of autocorrelation analysis under a three-level energy system, the IFET kinetics of single dye molecules in the conduction band of TiO2 NPs is evaluated to be (1.0 {\textpm} 0.1){\texttimes}104 s-1 averaged over 100 single molecules and the back ET rate constant is 4.7 {\textpm} 0.9 s-1. When a thicker TiO2 film is substituted, the resultant kinetic data do not make a significant difference. The trend of IFET efficacy agrees with the method of fluorescence lifetime measurements. The obtained forward ET rate constants are about ten times smaller than the photovoltage response measured in an assembled dye-sensitized solar cell. The discrepancy is discussed. The inhomogeneous and fluctuation characters for the IFET process are attributed to microenvironment variation for each single molecule. The obtained ET rates are much slower than the fluorescence relaxation. Such a small ET quantum yield is yet feasibly detectable at a single molecule level. {\textcopyright} 2010 American Chemical Society.</p>
},
	keywords = {Autocorrelation analysis, Average lifetime, Confocal fluorescence microscopy, Current system, Dye molecule, Dye-Sensitized solar cell, Electron mobility, Electron transitions, Energy systems, Fluorescence, Fluorescence lifetime measurements, Fluorescence lifetimes, Fluorescence microscopy, Heterojunctions, Interfacial electron transfer, Kinetic data, Microenvironments, MOLECULES, NANOPARTICLES, Nitrogen compounds, Photo-induced electron transfer, Photovoltage response, Physisorption, Pulsed laser, Pulsed laser applications, Pulsed lasers, Rate constants, Single dye molecules, Single molecule, Single molecule level, Solar cells, Three-level, TiO},
	doi = {10.1021/la904273x},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-77952855207\&doi=10.1021\%2fla904273x\&partnerID=40\&md5=4c0c2dbdc32427366e505e21ba536ae5},
	author = {Chen, Y.-J. and Tzeng, H.-Y. and Fan, H.-F. and Chen, M.-S. and Huang, J.-S. and Lin, K.-C.}
}
