Electrochemical synthesis and optical characterization of copper selenide nanowire arrays within the alumina pores

Aqueous preparation of surfactant-free copper selenide nanowires

“…[35] For example, stoichiometric cuprous selenide nanowires have been utilized to fabricate catalytic electrode for oxygen reduction reaction, [36] and nonstoichiometric ones have been used to construct the photoluminescence type sensor of humidity. [37] In this work, we successfully synthesized uniform surfactant-free copper selenide (Cu 2-x Se) nanowire bundles on gram-scale via an aqueous route. The resultant Cu 2-x Se nanowire bundles have diameters of 100-300 nm and lengths of tens of micrometers.…”

Transient absorption of copper selenide nanowires of different stoichiometry

“…1. A broad absorption band present in the near-infrared spectral region right below the edge of the fundamental absorption band is a common feature of nanostructures containing double valence copper (e. g. CuSe, CuFeS 2 ) [13,18,19]. Middle-gap states are formed in these compositions and thus the additional low energy absorption band shall be attributed to electron transitions from these states to the conduction band.…”

Annealing Effects on the Metal and Semiconductor Nanowires Loaded Inside the Alumina Pores

“…The formation of copper selenide nanowire arrays, in particular those of Cu 2-x Se and Cu 3 Se 2 within alumina pores has been demonstrated by us in an aqueous solution of CuSO 4 , MgSO 4 and H 2 SeO 3 at proper concentrations and pH by alternating current deposition (Jagminas et al 2006). However, only an almost pure phase of Cu 1,75 Se showing both a direct energy bandgap, E g,dir , of about 2.3 eV and a defect related optical absorption band close to 1.1 eV, has been deposited using sulfuric acid alumina templates with an average pore diameter, Ø pore , of 15 nm.…”