Abstract
TiO2–CdO composite rods were synthesized through a hydrothermal method and sputtering thin-film deposition. The hydrothermally derived TiO2 rods exhibited a rectangular cross-sectional crystal feature with a smooth surface, and the as-synthesized CdO thin film exhibited a rounded granular surface feature. Structural analyses revealed that the CdO thin film sputtered onto the surfaces of the TiO2 rods formed a discontinuous shell layer comprising many island-like CdO crystallites. The TiO2–CdO composite rods were highly crystalline, and their surfaces were rugged. A comparison of the NO2 gas-sensing properties of the CdO thin film, TiO2 rods, and TiO2–CdO composite rods revealed that the composite rods exhibited superior gas-sensing responses to NO2 gas than did the CdO thin film and TiO2 rods, which can be attributed to the microstructural differences and the formation of heterojunctions between the TiO2 core and CdO crystallites.
Highlights
Gas sensors based on oxide semiconductors, such as TiO2, have the potential to detect harmful and toxic gases with high sensitivity [1,2,3,4]
TiO2 –CdO core–shell composite rods were initially synthesized through a combination of hydrothermal and sputtering methods
Electron microscopy analyses revealed that the surfaces of the as-synthesized TiO2 rods were smooth
Summary
Gas sensors based on oxide semiconductors, such as TiO2 , have the potential to detect harmful and toxic gases with high sensitivity [1,2,3,4]. TiO2 nanostructures have a large surface-to-volume ratio because of their one-dimensional structure, which is advantageous in providing high surface effects between the oxide surface and the detected gases. TiO2 -based one-dimensional structures with various morphologies for application as gas-sensing devices. The high acetone gas-sensing response of electrospinning-synthesized TiO2 nanorods was investigated at 500 ◦ C [5]. TiO2 nanotubes synthesized through anodization of Ti foil at room temperature were used to detect H2 gas [6]. Many core–shell structures of TiO2 -based nanomaterials have been synthesized, and their applications in gas sensing have been investigated.
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