Citation:
WANG Yue-Hui, SHEN Jian-Hong. Effects of Silver Nanoparticles with Different Electrical Properties on the Spectroscopic Properties of Methyl Orange[J]. Acta Physico-Chimica Sinica,
;2012, 28(06): 1313-1319.
doi:
10.3866/PKU.WHXB201203292
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The effects of positive/negative silver nanoparticles on the spectroscopic properties of methyl orange (MO) in solution at different pH values were studied by UV-visible (UV-Vis) absorption spectroscopy and fluorometry. New complexes were formed by the strong electrostatic interaction between positive silver nanoparticles (P-Ag) and the MO so that UV-Vis absorption spectra showed the performance of the complexes. However, the UV-Vis absorption spectra only showed superposition of component peaks after addition of negative silver nanoparticles (N-Ag) to MO solution because of the weak interaction between N-Ag and MO induced by electrostatic repulsion. S1→S0 was significantly enhanced in the MO solution containing P-Ag. The largest and smallest fluorescence enhancement ratios were observed at pH 2.1 and 4.8, respectively. The fluorescence intensity of S2→S0 decreased and was almost independent of pH. Similar trends were observed for the MO solution containing N-Ag, except that the intensity of S1→S0 was slightly enhanced in the presence of a small amount of N-Ag. The effects of silver nanoparticles with different electrical properties on the spectroscopic properties of MO depend on the interaction between MO and the silver nanoparticles as well as local field enhancement and non-radiative energy transfer.
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