Structural, optical and photocatalytic studies of oleylamine capped PbS nanoparticles
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Structural, optical and photocatalytic studies of oleylamine capped PbS nanoparticles Abimbola E. Oluwalana1 · Peter A. Ajibade1 Received: 6 June 2020 / Accepted: 20 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Bis(phenylpiperazine dithiocarbamato)lead(II) complex was synthesized, characterized and thermolyzed in oleylamine at 150, 190 and 230 °C to prepare lead sulphide (PbS) nanoparticles. The powder X-ray diffraction patterns of the PbS nanoparticles were indexed to the cubic rock salt phase. The size of the PbS nanoparticles obtained from transmission electron microscope (TEM) is 13.11–36.35 nm for PbS1 prepared at 150 °C, 24.26– 55.44 nm for PbS2 prepared at 190 °C and 48.27–98.88 nm for PbS3 prepared at 230 °C. The estimated bandgap energy of the PbS nanoparticles from Tauc plot is in the range 4.20–4.33 eV. PbS2 and PbS3 showed broad emission spectra at 474 nm and 465 nm respectively, while sharp emission was observed for PbS3 at 446 nm. The as-synthesized PbS nanoparticles was used as photocatalyst for the degradation of rhodamine B with 50.58% efficiency and high recyclability properties after four reuses without any sign of deactivation. Keywords Photoluminescence behaviour · Molecular precursors · Optical properties · PbS nanoparticles · Nanophotocatalyst · Dye degradation
1 Introduction Interest in IV–VI semiconductor nanoparticles are due to their size-dependent luminescence, electrical and optical properties that markedly differ from bulk counterparts (Meng et al. 2019). Lead sulphide (PbS) has a narrow bandgap with a large Bohr’s radii of 18–20 nm, minute effective mass of hole and electron with high dielectric constant and mobility carrier which make research in PbS attractive (Wang et al. 2019). PbS has found application in chemical detector (Ghomian et al. 2017), memory device (Murgunde et al. 2018), sensors (Sonawane et al. 2017), solar cells (Kim et al. 2018), photocatalyst (Mohamed and Aazam 2015), semiconductors (Kumar and Jakhmola 2006), photodetectors (Ren et al. 2017), LED devices, lasers, solar absorbers and optical switches among others. * Peter A. Ajibade [email protected] 1
School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa
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Techniques such as hydrothermal (Salavati-Niasari and Loghman-Estarki 2012), microemulsion (Li et al. 2017), co-precipitation (Parveen et al. 2018), gamma-irradiation (Kuljanin-Jakovljević et al. 2017), sonochemical (Akbay and Ölmez 2018), microwave irradiation (Shkir et al. 2020), solvothermal (Ding et al. 2018), spray pyrolysis (Veena et al. 2017), and single-source precursor (Chintso and Ajibade 2015; Ajibade and Oluwalana 2019a, b) are being to prepare semiconductor nanoparticles. Among these synthetic techniques, single-source precursor technique is very effective and produces nanoparticles with good size and shape, reduced impurities and stabili
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