Photoelectrochemical characterization of Cu2O-nanowire arrays electrodeposited into anodic alumina membranes
- Authors: INGUANTA R; SUNSERI C; PIAZZA S
- Publication year: 2007
- Type: Articolo in rivista (Articolo in rivista)
- Key words: NANOWIRE ARRAYS; CU2O NANOWIRES; TIO2 NANOTUBES; NI NANOWIRES; FABRICATION; TEMPLATE; COPPER; FILMS; LAYERS; OXIDE
- OA Link: http://hdl.handle.net/10447/17400
Abstract
Perfectly aligned nanowire arrays of polycrystalline Cu2O were grown by template-pulsed electrodeposition from a cupric acetate-sodium acetate bath into anodic alumina membranes (AAM). The photoelectrochemical behavior of arrays with different nanowire lengths (0.5 mu m and 2 mu m) was investigated in neutral solution, and the results compared to those pertaining to Cu2O films grown with the same procedure. Although all samples displayed the same indirect bandgap (similar to 1.9 eV), differences were observed both in photocurrent intensity and sign. The latter changed with potential and wavelength in different ways for nanowires and films, revealing a different defect concentration in the two cases.