title: ns or fs pulsed laser ablation of a bulk InSb target in liquids for nanoparticles synthesis.
abstract: Laser ablation of bulk target materials in liquids has been established as an alternative method for the synthesis of nanoparticles colloidal solutions mainly due to the fact that the synthesized nanoparticles have bare, ligand-free surfaces since no chemical precursors are used for their synthesis. InSb is a narrow band gap semiconductor which has the highest carrier mobility of any known semiconductor and nanoparticles of this material are useful in optoelectronic device fabrication. In this paper a bulk InSb target was ablated in deionized (DI) water or ethanol using a nanosecond (20 ns) or a femtosecond (90 fs) pulsed laser source, for nanoparticles synthesis. In all four cases the largest percentage of the nanoparticles are of InSb in the zincblende crystal structure with fcc lattice. Oxides of either In or Sb are also formed in the nanoparticles ensembles in the case of ns or fs ablation, respectively. Formation of an oxide of either element from the two elements of the binary bulk alloy is explained based on the difference in the ablation mechanism of the material in the case of ns or fs pulsed laser irradiation in which the slow or fast deposition of energy into the material results to mainly melting or vaporization, respectively under the present conditions of ablation, in combination with the lower melting point but higher vaporization enthalpy of In as compared to Sb. InSb in the metastable phase with orthorhombic lattice is also formed in the nanoparticles ensembles in the case of fs ablation in DI water (as well as oxide of InSb) which indicates that the synthesized nanoparticles exhibit polymorphism controlled by the type of the laser source used for their synthesis. The nanoparticles exhibit absorption which is observed to be extended in the infrared region of the spectrum.
authors: University of Exeter, Dept. of Physics, Exeter EX4 4QL, UK. Electronic address: nsemaltianos@yahoo.com.
authors: N G
authors: NG
authors: Semaltianos
authors: University of Exeter, Dept. of Physics, Exeter EX4 4QL, UK.
authors: E
authors: E
authors: Hendry
authors: University of Exeter, Dept. of Engineering, Exeter EX4 4QF, UK.
authors: H
authors: H
authors: Chang
authors: University of Exeter, Dept. of Engineering, Exeter EX4 4QF, UK.
authors: M L
authors: ML
authors: Wears
authors: Université de Franche-Comté, Femto-st, Dépt. Mécanique Appliquée, UMR CNRS 6174, Besançon 25030, France.
authors: G
authors: G
authors: Monteil
authors: Université de Franche-Comté, Femto-st, Dépt. Mécanique Appliquée, UMR CNRS 6174, Besançon 25030, France.
authors: M
authors: M
authors: Assoul
authors: Université de Franche-Comté, Femto-st, Dépt. Mécanique Appliquée, UMR CNRS 6174, Besançon 25030, France.
authors: V
authors: V
authors: Malkhasyan
authors: Université de Franche-Comté, Femto-st, Dépt. Temps-Fréquence, UMR CNRS 6174, Besançon 25030, France.
authors: V
authors: V
authors: Blondeau-Patissier
authors: Université de Franche-Comté, Femto-st, Dépt. Micro Nano Sciences & Systèmes, UMR CNRS 6174, Besançon 25044, France.
authors: B
authors: B
authors: Gauthier-Manuel
authors: Université de Franche-Comté, UTINAM, UMR CNRS 6213, Besançon 25030, France.
authors: V
authors: V
authors: Moutarlier
keywords: InSb; Laser ablation; Nanoparticles