Size-Dependent Inhibition and Enhancement by Gold Nanoparticles of Luminol-Ferricyanide Chemiluminescence

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• 作者：Chunfeng Duan ; Hua Cui ; Zhifeng Zhang ; Bo Liu ; Jizhao Guo ; Wei Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：March 29, 2007
• 年：2007
• 卷：111
• 期：12
• 页码：4561 - 4566
• 全文大小：216K
• 年卷期：v.111,no.12(March 29, 2007)
• ISSN：1932-7455

文摘

It was found that gold nanoparticles of small size (<5 nm) could inhibit the chemiluminescence (CL) of theluminol-ferricyanide system, whereas gold nanoparticles of large size (>10 nm) could enhance this CL, andthe most intensive CL signals were obtained with 25-nm-diameter gold nanoparticles. The luminophor wasidentified as the excited-state 3-aminophthalate anion. The studies of UV-visible spectra, CL spectra, X-rayphotoelectron spectra, effects of concentrations of luminol and ferricyanide solution, and fluorescence quenchingefficiency of gold colloids were carried out to explore the CL inhibition and enhancement mechanism. TheCL inhibition by gold nanoparticles of small size was supposed to originate from the competitive consumptionof ferricyanide by gold nanoparticles and the relatively high quenching efficiency of the luminophor by goldnanoparticles. In contrast, the CL enhancement by gold nanoparticles of large size was ascribed to the catalysisof gold nanoparticles in the electron-transfer process during the luminol CL reaction and the relatively lowquenching efficiency of the luminophor by gold nanoparticles. This work demonstrates that gold nanoparticleshave the size-dependent inhibition and enhancement in the CL reaction, proposing a perspective for theinvestigation of new and efficient nanosized inhibitors and enhancers in CL reactions for analytical purposes.