title: Fluorosurfactant-capped gold nanoparticles-enhanced chemiluminescence from hydrogen peroxide-hydroxide and hydrogen peroxide-bicarbonate in presence of cobalt(II).
abstract: Nonionic fluorosurfactant (FSN)-capped gold nanoparticles (GNPs) remain excellently stable at a wider pH range and high ionic strength, which is useful to investigate some CL systems involved in high salt and a strict pH range. In this study, we utilized FSN-capped GNPs of different sizes to distinguish the emitting species from H2O2-Co2+-NaOH and H2O2-Co2+-NaHCO3 systems. When the pH of FSN-capped gold colloidal solution was adjusted to 10.2 by dropwise addition of 0.05 M NaOH, the CL intensity of H2O2-Co2+-NaHCO3 system was enhanced 6-fold or 60-fold respectively in the presence of FSN-capped 14 nm or 69 nm GNPs with comparison to H2O2-Co2+-NaOH. The variation of CL spectra and UV-vis spectra, as well as the quenching effect of reactive oxygen species scavengers were studied in detail to understand the CL enhancement mechanisms of FSN-capped GNPs on the two systems. For H2O2-Co2+-NaOH system, the gold(I) complexes intermediate and singlet oxygen dimol species were proposed as the emitting species. The excited states of the carbon dioxide dimers and singlet oxygen dimol species were considered responsible for the light emission of H2O2-Co2+-NaHCO3 system. To our knowledge, this work is the first time to study the two CL systems simultaneously using nanoparticles.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Jinge
authors.initials: J
authors.lastname: Li
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Lu
authors.forename: Lixia
authors.initials: L
authors.lastname: Zhao
authors.forename: Jin-Ming
authors.initials: JM
authors.lastname: Lin
mesh_terms: D001639:Bicarbonates / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003102:Colloids / Q000737:chemistry; D019281:Dimerization; D005453:Fluorescence; D016166:Free Radical Scavengers / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D015203:Reproducibility of Results; D026082:Singlet Oxygen / Q000737:chemistry; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D001639:Bicarbonates; D003102:Colloids; D016166:Free Radical Scavengers; D006878:Hydroxides; D008024:Ligands; D012996:Solutions; D013501:Surface-Active Agents; D002245:Carbon Dioxide; D026082:Singlet Oxygen; D003035:Cobalt; D006046:Gold; C031356:hydroxide ion; D006861:Hydrogen Peroxide