Enhanced chemiluminescence of the luminol–AgNO3 system by Ag nanoparticles |
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Authors: | Shifeng Li Huimin Sun Dong Wang Jianguo Hong Shanjun Tao Haiyin Yu Xiuhua Wang Xianwen Wei |
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Institution: | 1. +86 553 3937138+86 553 3869303;2. College of Chemistry, Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, , Wuhu, 241000 People's Republic of China |
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Abstract: | The oxidation reaction of luminol with AgNO3 can produce chemiluminescence (CL) in the presence of silver nanoparticles (NPs) in alkaline solution. Based on the studies of UV‐vis absorption spectra, photoluminescence (PL) spectra and CL spectra, a CL enhancement mechanism is proposed. The CL emission spectrum of the luminol–AgNO3–Ag NPs system indicated that the luminophore was still 3‐aminophthalate. On injection of silver nanoparticles into the mixture of luminol and AgNO3, they catalysed the reduction of AgNO3 by luminol. The product luminol radicals reacted with the dissolved oxygen, to produce a strong CL emission. As a result, the CL intensity was substantially increased. Moreover, the influences of 18 amino acids, e.g. cystine, tyrosine and asparagine, and 25 organic compounds, including gallic acid, tannic acid and hydroquinone, on the luminol–AgNO3–Ag NPs CL system were studied by a flow‐injection procedure, which led to an effective method for detecting these compounds. Copyright © 2011 John Wiley & Sons, Ltd. |
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Keywords: | chemiluminescence Ag nanoparticles luminol organic compounds |
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