title: Fluorescent chemosensor for pyridine based on N-doped carbon dots.
abstract: Fluorescent carbon dots (CDs) and its nitrogen doped (N-CDs) nanoparticles have been synthesized from lactose as precursor using a bottom-up hydrothermal methodology. The synthesized nanoparticles have been characterized by elemental analysis, FTIR, Raman, TEM, DLS, XPS, and steady-state and life-time fluorescence. The synthesized carbon nanoparticles, CDs and N-CDs, have a size at about 7.7±2.4 and 50±15nm, respectively, and quantum yields of 8% (CDs) and 11% (N-CDs). These techniques demonstrated the effectiveness of the synthesis procedure and the functionalization of the CDs surface with amine and amide groups in the presence of NH3 in aqueous media. The effect of excitation wavelength and pH on the luminescent properties was studied. Under the optimal conditions, the nitrogen doped nanoparticles can be used as pyridine sensor in aqueous media because they show an enhancement of its fluorescence with a good linear relationship. The analytical method is simple, reproducible and very sensitive for pyridine determination.
authors.affiliation: Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal.
authors.forename: B B
authors.initials: BB
authors.lastname: Campos
authors.affiliation: Department of Analytical Chemistry and Food Technology Department, University of Castilla-La Mancha, Ciudad Real, Spain; Regional Institute for Applied Chemistry Research (IRICA), 13004 Ciudad Real, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Abellán
authors.affiliation: Regional Institute for Applied Chemistry Research (IRICA), 13004 Ciudad Real, Spain; Castilla-La Mancha Science and Technology Park, 20006 Albacete, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Zougagh
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Jimenez-Jimenez
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Rodríguez-Castellón
authors.affiliation: Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal.
authors.forename: J C G
authors.initials: JC
authors.lastname: Esteves da Silva
authors.affiliation: Department of Analytical Chemistry and Food Technology Department, University of Castilla-La Mancha, Ciudad Real, Spain; Regional Institute for Applied Chemistry Research (IRICA), 13004 Ciudad Real, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Ríos
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain. Electronic address: malgarra67@gmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Algarra
keywords: Carbon nanomaterial; N-doped carbon dots; Nanoparticle; Pyridine sensor