Influence of Li+ doping on the optical properties of PbS

Portillo, M. Chávez; Mathew, Xavier; Juárez, H.; Pacio, M.; Santiago, A. Cortés; Moreno, O. Portillo

doi:10.1016/j.spmi.2017.05.029

Cited by 13 publications

(2 citation statements)

References 34 publications

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“…A conceivable elucidation for the change in the E g is related to the diverse surface morphology and thickness of the samples, which is associated with the quantum confinement produced in corresponding superficial and volumetric defects producing E g shift. [ 39–42 ] Moreover, the increase in the bandgap energy is also ascribed to the partial filling of oxygen vacancies. [ 43 ] On increasing the concentration of Cu, a planar defect is produced which distorts the grain boundary and stacking due to the inclusion of new atoms.…”

Section: Resultsmentioning

confidence: 99%

Environmental Remediation of Real Textile Dyeing Wastewater Under Visible Light and Inactivation of Pathogenic Bacteria Using ZnO/CuO Nano‐Needles

Ramaraj

Mahalingam

Parimaladevi

et al. 2023

Physica Status Solidi (a)

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Textile industries have an immense existence in a country's economy. Large quantity of water is consumed by textile dyeing industries and produces volumes of wastewater. Treating these hazardous effluents to make them environmental friendly, using nanocatalysts is the best promising method. Metal oxide nanomaterials have emerged as an important tool for environmental remediation. Herein the hydrothermally synthesized ecofriendly and low‐cost zinc oxide/copper oxide nanocomposites (ZnO/CuO NCs) with different proportions of binary oxides are evaluated for the applications of degrading organic pollutants and antibacterial activity. The influence of doping is also studied in structural, optical, morphological, photocatalytic, and antibacterial activities. The presence of CuO in NCs affirms the formation of ZnO/CuO NCs. Photodegradation of Congo Red (CR) and real textile dyeing wastewater (TDW) under visible light irradiation by 0.5 M ZnO:0.5 M CuO NCs reveal them to act as a perfect catalyst by tuning doping concentration of Cu in ZnO, with 1.9 × 10−3 and 5.4 × 10−3 M min−1 rate constant. Hybrid nanocomposite materials exhibit high antibacterial activity against Staphylococcus aureus and Escherichia coli with 5 and 6 mm inhibition zone. The experimental characteristics of NCs are explained by a combination of electronic band structure due to size effect and tuning metal oxide proportions in comparison to that of pure metal oxide.

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Section: Resultsmentioning

confidence: 99%

Environmental Remediation of Real Textile Dyeing Wastewater Under Visible Light and Inactivation of Pathogenic Bacteria Using ZnO/CuO Nano‐Needles

Ramaraj

Mahalingam

Parimaladevi

et al. 2023

Physica Status Solidi (a)

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“…As a result, the transversely polarized excitation will produce a large electric field enhancement and remarkable magnetic field enhancement in the nanocup. , The plasmon resonances, especially the magnetic mode, induce large electromagnetic field confined inside the nanocups and near the open mouth with sharp edges, , just the location of CdS–PbS nanooctahedrons. In addition, due to the higher permittivity of PbS compared with CdS, PbS acts as the dielectric antenna and the intense local field is confined in CdS layer. ,,− The intense scattering of PbS dielectric antenna and the large local electromagnetic field of Au could both lead to the enhanced optical absorption and generation of e/h pairs benefiting the photocatalytic performance. The unique hybrid structure of Au@CdS–PbS heteronanostructures possesses the structural traits of the three individual components and exhibit excellent photocatalytic properties.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Photocatalytic Activity of Au-Capped CdS–PbS Heterooctahedrons by Morphology Control

Chen

Ding

et al. 2020

J. Phys. Chem. C

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We report the preparation of Au-capped CdS–PbS heterooctahedrons of Au@CdS–PbS with controlled morphology for enhanced photocatalytic H2 generation. Au@CdS–PbS heteronanostructures possess three advantages: (1) CdS–PbS octahedrons form a p-n heterojunction with built-in field for efficient separation of photoexcited charge carriers. (2) Au nanocups exhibit strong light-harvesting capability in broadband spectrum across the visible and near-infrared region induced by the electric quadrupole and magnetic dipole plasmon modes. (3) Due to the higher permittivity of PbS compared with CdS, the intense scattering of PbS dielectric antenna and large local field of Au plasmonic antenna could both lead to the enhanced optical absorption and generation of e/h pairs. By optimizing the morphology of Au@CdS–PbS, the largest normalized photocatalytic H2 generation rate of 400.6 μmol/g/h is obtained, which is 6.33 times that of the sum of pure CdS–PbS and standalone Au nanocups. This study provides the essential advantages of p–n heterojunction as well as magnetic plasmon resonance and dielectric antenna effect for the application of highly efficient photocatalysis.

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