Formation and Photocatalytic Application of ZnO Nanotubes Using Aqueous Solution

Abstract

Vertically aligned ZnO nanotubes were prepared by etching ZnO rod arrays in aqueous solution, which were previously developed by chemical bath deposition method. The morphological, structural, photoluminescence, as well as photocatalytic properties of the ZnO nanotubes were examined with respect to the pH values of chemical bath solution. The morphology of the products was found to be sensitive to the pH values and chemical bath temperatures. The nanotubes synthesized at a low pH value (5.82) exhibited a strong UV emission and a weak defect-related visible emission. The highest photocatalytic efficiency was also observed at pH = 5.82. The possible mechanism for the difference of photocatalytic efficiency was discussed.

Effect of Surfactant on Growth of ZnO Nanodumbbells and Their Characterization

“…According to Shi et al, NMR experiments show that, with increasing in the temperature, SDS aggregates to form large uniform circular disks and the size of the disk increases with the concentration of the SDS in the solution. In this process, disk shapes SD-(SO 4 2− ) get attracted to the (0001) face of ZnO from a twin structure and the SD-is sandwiched between two (0001) faces and ZnO crystal growth takes place along (000-1) faces. To confirm it and to see if there is any sulfur incorporation in the twin junction, we observed the EDX spectra.…”

“…ZnO has a wide direct-band gap of 3.37 eV and high-exciton-binding energy of 60 mV at room temperature. ZnO has been extensively studied because of its fascinating wide range of applications such as chemical sensors and biosensors, piezoelectricity, optoelectronics, photocatalysis, and photoelectrochemical water splitting [1][2][3][4][5][6][7][8]. In many of the applications, ZnO functional properties are highly affected by the morphology of the nanostructure.…”

Growth of Ultra-Long ZnO Microtubes Using a Modified Vapor-Solid Setup

“…To the best of our knowledge, until now, a challenge still exists in the rational design and facile synthesis of long ZnO microtubes (MTs), although ZnO nanotubes [33][34][35][36][37] have been extensively studied in recent years. Aqueous solution routes [38,39] were used for fabricating ZnO MTs with poly-crystalline structures.…”

Drastic improvement in magnetization of CdO nanoparticles by Fe doping

“…In these materials, the presence of magnetic ions such as 3d (TM) and/or 4f (RE) ions leads to an exchange interaction between itinerary sp band electrons or holes and the d-electron spins localized at the magnetic ions, leads to versatile magnetic field-induced functionalities (Furdyna 1988). Recently, DMSs have fascinated researchers because of their potential applications in spin-based multifunctional electronic devices including spin field-effect transistors, optoelectronics, field emission devices, gas sensors, ultraviolet absorbers, quantum computer, and nonvolatile memory devices (Moezzi et al 2012;Chu et al 2009;Zhang et al 2009;Liu et al 2009;Neal et al 2006;Huang et al 2009). …”