title: Laser Ablated Carbon Nanodots for Light Emission.
abstract: The synthesis of fluorescent carbon dots-like nanostructures (CNDs) obtained through the laser ablation of a carbon solid target in liquid environment is reported. The ablation process was induced in acetone with laser pulses of 1064, 532, and 355 nm under different irradiation times. Close-spherical amorphous CNDs with sizes between 5 and 20 nm, whose abundance strongly depends on the ablation parameters were investigated using electron microscopy and was confirmed using absorption and emission spectroscopies. The π- π* electronic transition at 3.76 eV dominates the absorption for all the CNDs species synthesized under different irradiation conditions. The light emission is most efficient due to excitation at 3.54 eV with the photoluminescence intensity centered at 3.23 eV. The light emission from the CNDs is most efficient due to ablation at 355 nm. The emission wavelength of the CNDs can be tuned from the near-UV to the green wavelength region by controlling the ablation time and modifying the ablation and excitation laser wavelength.
authors.affiliation: Department of Physics, University of North Texas, Denton, TX, USA.|Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario 100, Col. Centro, C.P. 50000, Toluca, Estado de México, México.
authors.forename: Delfino
authors.initials: D
authors.lastname: Reyes
authors.affiliation: Laboratorio de Investigación y Desarrollo de Materiales Avanzados, Facultad de Química, Universidad Autónoma del Estado de México, Campus Rosedal, Km 14.5 Carretera, Toluca-Atlacomulco, San Cayetano de Morelos, C.P. 50925, México.
authors.forename: Marco
authors.initials: M
authors.lastname: Camacho
authors.affiliation: Laboratorio de Fotomedicina, Biofotónica y Espectroscopía Láser de Pulsos Ultracortos, Facultad de Medicina, Universidad Autónoma del Estado de México, Jesús Carranza y Paseo Tollocan s/n, Toluca, C.P. 50120, México.
authors.forename: Miguel
authors.initials: M
authors.lastname: Camacho
authors.affiliation: Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario 100, Col. Centro, C.P. 50000, Toluca, Estado de México, México.
authors.forename: Miguel
authors.initials: M
authors.lastname: Mayorga
authors.affiliation: Department of Physics, University of North Texas, Denton, TX, USA.
authors.forename: Duncan
authors.initials: D
authors.lastname: Weathers
authors.affiliation: Department of Physics, University of Arkansas, Fayeteville, AR, USA.
authors.forename: Greg
authors.initials: G
authors.lastname: Salamo
authors.affiliation: Institute of Frontier and Fundamental Sciences, Univ. of Engineering Science and Technology, Chengdu, China.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Physics, University of North Texas, Denton, TX, USA. arup@unt.edu.|Institute of Frontier and Fundamental Sciences, Univ. of Engineering Science and Technology, Chengdu, China. arup@unt.edu.
authors.forename: Arup
authors.initials: A
authors.lastname: Neogi
keywords: Carbon nanodots; Laser ablation; Photoluminescence