title: Enhanced chemiluminescence of the luminol-AgNO3 system by Ag nanoparticles.
abstract: The oxidation reaction of luminol with AgNO(3) 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-AgNO(3)-Ag NPs system indicated that the luminophore was still 3-aminophthalate. On injection of silver nanoparticles into the mixture of luminol and AgNO(3), they catalysed the reduction of AgNO(3) 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-AgNO(3)-Ag NPs CL system were studied by a flow-injection procedure, which led to an effective method for detecting these compounds.
authors.affiliation: College of Chemistry, Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000, People's Republic of China. sfli@mail.ahnu.eu.cn
authors.forename: Shifeng
authors.initials: S
authors.lastname: Li
authors.forename: Huimin
authors.initials: H
authors.lastname: Sun
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Jianguo
authors.initials: J
authors.lastname: Hong
authors.forename: Shanjun
authors.initials: S
authors.lastname: Tao
authors.forename: Haiyin
authors.initials: H
authors.lastname: Yu
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Wang
authors.forename: Xianwen
authors.initials: X
authors.lastname: Wei
mesh_terms: D017022:Flow Injection Analysis; D049449:Luminescence; D008165:Luminol / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry*
chemical_list: D012834:Silver; D008165:Luminol; D012835:Silver Nitrate