Abstract
In this study, we report the synthesis of ZnO nanoparticles from Zn dross via hydrometallurgical method by using acetic acid as a leaching agent. D205 dye molecules were then adsorbed onto Zn dross originated ZnO nanoparticle film. The optical absorption confirms the photosensitization of the synthesized ZnO nanoparticles with dye. The photoluminescence spectra reveal the excitonic- and defect-related emission of ZnO nanoparticles. Compared to ZnO nanoparticles only, the longer emission lifetime of ZnO nanoparticles with adsorbed dye indicates the transfer of photoexcited electrons from dye to the ZnO nanoparticles. Furthermore, photodetection characterization of ZnO film show the enhanced current density with the presence of dye under simulated solar illumination, while that measured at dark is similar in both films with and without dye. This result confirms the potentiality of Zn dross to be recycled into valuable ZnO nanoparticles particularly for the applications in the visible light region, especially for sensing.
Highlights
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Wide band gap semiconductors have been considered as active materials in many applications such as light-emitting devices [1,2,3], solar cells [4,5,6], and photocatalysis [7,8,9]
ZnO nanoparticles were synthesized by using Zn dross as the raw material, in which the recovery of zinc element contained in the dross was conducted via the hydrometallurgical method [18]
ZnO nanoparticles have been successfully synthesized from ZnO dross via hydrometallurgical method
Summary
Wide band gap semiconductors have been considered as active materials in many applications such as light-emitting devices [1,2,3], solar cells [4,5,6], and photocatalysis [7,8,9]. One of the wide band gap semiconductors is ZnO with the band gap of 3.1–3.3 eV, and absorbing light only in the UV region [10]. Tuning the properties of ZnO materials has been pursued by doping with other elements [15,16]. These approaches were carried out intentionally by using specific chemical precursors to allow preferentially the formation of high quality of ZnO nanomaterials
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