Abstract
Crystalline lead sulfide (PbS) nanowires doped with terbium (Tb3+) ions were synthesized by the chemical bath deposition method at room temperature. The powder was obtained from an aqueous solutions using lead acetate dehydrate, terbium nitrate, thiourea, potassium hydroxide and ammonia. The terbium molar concentrations were varied in the deposition process to investigate the effect on the structural, optical, morphological and luminescent properties of PbS nanowires. The crystalline size was found to be dependent on the concentration of the Tb3+ ions used. The estimated average crystalline sizes were calculated from the X-ray diffraction and found to be 34, 33 and 37 nm for PbS: 0% Tb3+, PbS: 0.2% Tb3+ and PbS: 0.5% Tb3+, respectively. The scanning electron microscopy micrographs depict nanowire shape for the undoped as well as Tb-doped samples. The energy-dispersive X-ray and Auger electron spectroscopy analyses confirmed the presence of all the expected elements. The solid powder nanowires exhibited high absorptions in the UV–Vis regions. The band gap energies were estimated in the range of 1.99–2.46 eV. The absorption edge and the band gap energies of these PbS nanowires have shifted depending on the concentration of the dopant. The maximum luminescence intensity was obtained for PbS: 0.2% Tb3+ ions and luminescent quenching was observed for higher terbium concentrations.Graphic abstract
Highlights
Solution chemistry has been applied to many mixed sulfide and oxide systems for preparation of semiconductors, photocatalysts, glasses, coatings, and other materials [1].1 3 Vol.:(0123456789)Journal of Nanostructure in Chemistry (2020) 10:1–7Nowadays, nanomaterials have several functionalities and enhanced physical and chemical properties [2]
We report for the first time the synthesis and characterization of PbS nanowires doped with lanthanides group Tb3+ ions
The undoped and Tb-doped PbS nanowires have been successfully synthesized by the chemical bath deposition technique
Summary
Solution chemistry has been applied to many mixed sulfide and oxide systems for preparation of semiconductors, photocatalysts, glasses, coatings, and other materials [1].1 3 Vol.:(0123456789)Journal of Nanostructure in Chemistry (2020) 10:1–7Nowadays, nanomaterials have several functionalities and enhanced physical and chemical properties [2]. The band gap energy of PbS can be changed from 0.41 eV to the values up to 5.2 eV by varying the shape and size from the bulk materials to nanocrystal structures [10] Several synthesis techniques such as microemulsion [11], chemical bath deposition (CBD) [12], sol–gel [13], solvothermal process [14] and sonochemical method [15] have been used to synthesize undoped PbS nanocrystal structures. The main objective of this report is to provide a comprehensive study on the effects of T b3+ doping on the structural, optical, morphological and the photoluminescence properties of PbS nanowires using costeffective and eco-friendly chemical bath deposition route. We report for the first time the synthesis and characterization of PbS nanowires doped with lanthanides group Tb3+ ions
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