A Sonoelectrochemical Synthesis of Nanosized CdS on the TiO_2 Nanotubes Array for Highly Enhancing Photoelectrochemical Reactivity

摘要

The nanoparticles of CdS were precipitated onto self-organized TiO_2 nanotube array photo-electrodes using sonochemical synthesis combining with constant current electrochemical deposition at 50 °C. The CdS nanoparticles, averaging 28.1 nm in diameter, were deposited on TiO_2 nanotubes. The prepared CdS nanoparticles were smaller in diameter and were better dispersed than when using plain electrodeposition. The sonochemical technique greatly reduced the temperature of electrochemical synthesis of CdS nanoparticles and the prepared CdS-TiO_2 nanocomposite possessed a stronger photocurrent response in both UV and the visible region. Additionally, a schematic diagram was proposed to illustrate the possible interaction between sonochemistry and electrochemical deposition.