文獻名： Synthesis of naked vanadium pentoxide nanoparticles

作者： Patrick Taylor ^a, Matthew Kusper ^a, Tina Hesabizadeh ^a, Luke D. Geoffrion ^a, Fumiya Watanabe ^b, Etienne Herth ^c and Grégory Guisbiers ^a

^aDepartment of Physics and Astronomy, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, AR 72204, USA.
^bCenter for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, AR 72204, USA
^cCentre de Nanosciences et de Nanotechnologies, CNRS UMR 9001, Univ. Paris-Sud, Université Paris-Saclay, 91120, Palaiseau, France

摘要：Vanadium pentoxide is the most important vanadium compound by being the precursor to most vanadium alloys. It also plays an essential role in the production of sulfuric acid as well as in metal-ion batteries and supercapacitors. In this paper, pulsed laser ablation in liquids is used to synthesize “naked” vanadium pentoxide nanostructures. The resulting particles take up “nearly-spherical” and “flower-like” morphologies, composed of α-V₂O₅ and β-V₂O₅ crystalline phases. Even “naked”, the nanostructures are stable in time with a zeta potential of −51 ± 7 mV. In order to maximize the production of vanadium pentoxide nanostructure, the optimal repetition rate was determined to be @ ∼6600 Hz when irradiating a pure vanadium target in DI-water. This corresponds to a cavitation bubble lifetime of around ∼0.15 ms. At that repetition rate, the production reached ∼10 ppm per minute of irradiation. Finally, from the characterization of the α-V₂O₅ and β-V₂O₅ nanostructures, the surface energy of each phase has been carefully determined at 0.308 and 1.483 J cm⁻², respectively. Consequently, the β-phase was found to display a surface energy very close to platinum. The exciton Bohr radius has been determined at 3.5 ± 0.7 nm and 2.0 ± 0.6 nm for α-V₂O₅ and β-V₂O₅ phases, respectively.

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