One-step electrochemical synthesis and physico-chemical characterization of CdSe nanotubes

Highlights: ► Electrodeposition of (∼700 nm long) and stoichiometric CdSe nanotubes (Cd/Se 0.93/1) into anodic alumina template was first achieved by cyclic voltammetric method. ► CdSe nanotubes are identified through XRD and Raman spectra. ► Photoelectrochemical results indicates that CdSe NTs are photoactive with direct band gap of 1.75 eV and n-type semiconducting behaviour. -- Abstract: Stoichiometric CdSe nanotubes (NTs) with a length of ∼700 nm have been successfully grown by one-step electrochemical technique into anodic alumina membranes. Cyclovoltammetric method has been performed using porous anodic alumina as template electrode and an electrochemical bath containing Cd2+ ions and SeO2. The as-prepared NTs have been identified as face-centred-cubic CdSe by XRD, while micro-Raman analysis reveals the typical peaks of nanostructured CdSe. The stoichiometric deposition of CdSe NTs formation is suggested by EDX analysis, with an average atomic percentage of Cd:Se of ∼0.93. Photoelectrochemical measurements reveal that CdSe NTs are photoactive materials with direct band gap of 1.75 eV and n-type semiconducting behaviour