Preparation, characterization, and photophysical properties of alkanethiols with pyrene units-capped gold nanoparticles: Unusual fluorescence enhancement for the aged solutions of these gold nanoparticles

Langmuir

Volumn 18, Issue 5, 2002, Pages 1840-1848

  Wang, Tongxin ^a   Zhang, Deqing ^a   Xu, Wei ^a   Yang, Junlin ^a   Han, Rui ^a   Zhu, Daoben ^a  

^a INSTITUTE OF CHEMISTRY   (China)

Author keywords

[No Author keywords available]

Indexed keywords

PHOTOPHYSICS;

ADSORPTION; FLUORESCENCE; FOURIER TRANSFORM INFRARED SPECTROSCOPY; GOLD; MONOLAYERS; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; SOLUTIONS; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET SPECTROSCOPY; X RAY PHOTOELECTRON SPECTROSCOPY;

NANOSTRUCTURED MATERIALS;

EID: 0037023076     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la0112817     Document Type: Article

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35. As compared to the respective aged solutions of nanoparticle I, the degree of fluorescence enhancement for the aged solutions of nanoparticle II is relatively small. This is probably due to their differences in size and number of thiols on their surfaces.
36. We tentatively use the lifetimes (see Table 2) of the aged solutions of nanoparticle I (37.6 ns) and nanoparticle II (42.6 ns) for the estimation of their excimer fluorecences quenching constants.
37. On the contrary, it was reported that the quenching rate constants were much higher for clusters of organic molecules than for the monomeric analogue, probably due to the entrapment of the quencher molecules in the clusters (see Kamat, P.V.; et al. Langmuir 2001, 17, 2930). For nanoparticle I and nanoparticle II, such entrapment of quencher molecules (1,4-dicyanobenzene) may be not possible owing to the relatively dense packing of thiols on the surfaces of gold nanoparticles.
38. It seems possible to study the chain-length dependence of energy transfer process from excited pyrene units to gold surface with the aged solutions of nanoparticle I and nanoparticle II, but due to the differences in size and composition, such comparative studies with nanoparticle I and nanoparticle II are not well suited. It is difficult for us to obtain nanoparticle I and nanoparticle II with the same size and composition.