title: Microwave-assisted synthesis of carbon dots and its potential as analysis of four heterocyclic aromatic amines.
abstract: Fluorescent water soluble carbon nanoparticles, in short carbon dots (CDs), was synthesized from lactose by microwave assisted hydrochloric acid method. Characterized by TEM and DLS to obtain the morphology shape (average 10nm in size), with a higher negative surface charge supported by the composition was obtained by XPS spectroscopy. The maximum of the emission was centered at 450 nm with a lifetime of 2.1 ns. Without further functionalization of the CDs a nanosensor was obtained that responded exponentially to HAAs in the 0.35-0.45 mg L(-1) concentration range by fluorescence static quenching, demonstrated by the lifetime analysis of the CDs in presence of HAAs. Some amino compounds were selected as model for interferences to evaluate the selectivity of this method, showing a notorious added value, with recoveries around 98%. The accuracy of the method was in terms of RSD about 2.5%. The results suggest their promising applications in chemical sensing.
authors.affiliation: Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, 13004 Ciudad Real, Spain; Regional Institute for Applied Chemistry Research, IRICA, 13004 Ciudad Real, Spain.
authors.forename: C
authors.initials: C
authors.lastname: López
authors.affiliation: Regional Institute for Applied Chemistry Research, IRICA, 13004 Ciudad Real, Spain; Albacete Science and Technology Park, 2006 Albacete, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Zougagh
authors.affiliation: Department of Inorganic Chemistry, University of Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain. Electronic address: malgarra67@gmail.com.
authors.forename: M
authors.initials: M
authors.lastname: Algarra
authors.affiliation: Department of Inorganic Chemistry, University of 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 e Bioquímica, Faculdade de Ciências da Universidade do Porto, Porto, Portugal.
authors.forename: B B
authors.initials: BB
authors.lastname: Campos
authors.affiliation: Centro de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Porto, Portugal.
authors.forename: J C G
authors.initials: JC
authors.lastname: Esteves da Silva
authors.affiliation: Department of Inorganic Chemistry, University of Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Jiménez-Jiménez
authors.affiliation: Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, 13004 Ciudad Real, Spain; Regional Institute for Applied Chemistry Research, IRICA, 13004 Ciudad Real, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Ríos
mesh_terms: D002244:Carbon / Q000737:chemistry*; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000032:analysis*; D007785:Lactose / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D008872:Microwaves; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D045663:Quantum Dots / Q000737:chemistry* / Q000648:ultrastructure; D011810:Quinoxalines / Q000032:analysis*; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D007093:Imidazoles; D011810:Quinoxalines; D002244:Carbon; D007785:Lactose; D006851:Hydrochloric Acid
keywords: Carbon dots; Fluorescence quenching; Heterocyclic aromatic amines; Sensor