Details

Autor(en) / Beteiligte

• Fernandes, Jesum A
• Khan, Sherdil
• Baum, Fabio
• Kohlrausch, Emerson C
• Lucena dos Santos, Jose Augusto
• Baptista, Daniel L
• Teixeira, Sergio R
• Dupont, Jairton
• Santos, Marcos JLeite

Titel

Synergizing nanocomposites of CdSe/TiO sub(2) nanotubes for improved photoelectrochemical activity viathermal treatment

Ist Teil von

• Dalton transactions : an international journal of inorganic chemistry, 2016-06, Vol.45 (24), p.9925-9931

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this work, we show the effect of the thermal treatment temperature on the photoelectrochemical (PEC) activity of CdSe/TiO sub(2) nanocomposites. TiO sub(2) nanotubes (NTs) were synthesized by anodization and the nanocomposites were obtained by depositing CdSe clusters viamagnetron sputtering. A two-step thermal treatment was performed: heating the TiO sub(2) NTs at different temperatures prior to CdSe deposition and further heating the CdSe/TiO sub(2) nanocomposites. The nanocomposites were characterized by Rutherford backscattering spectroscopy (RBS), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), UV-Vis spectrophotometry, and electrochemical impedance spectroscopy (EIS). To compare the PEC performance of the CdSe/TiO sub(2) nanocomposites and pristine TiO sub(2) NTs, linear sweep voltammetry (LSV) curves were obtained under visible light and under 1 sun illumination. It was observed that CdSe incorporation into the TiO sub(2) template enhances the visible light absorbance thereby improving the PEC performance of the nanocomposites. We have found that the optical, structural and PEC properties of the CdSe/TiO sub(2) nanocomposites are dependent on the thermal treatment temperature of the TiO sub(2) nanotubular substrate, prior to CdSe deposition. Moreover, a three-fold improvement in photocurrent was observed upon further thermal treatment of the obtained nanocomposite.