Optical and structural properties of PbSIn3+ nanocrystals grown by chemical bath

Moreno, O. Portillo; Pérez, R. Gutiérrez; Palomino-Merino, R.; Portillo, M. Chávez; Téllez, G. Hernández; Rosas, E. Rubio

doi:10.1016/j.tsf.2016.10.018

Cited by 31 publications

(12 citation statements)

References 29 publications

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“…In order to stabilize the crystal structure, the GS of PbS is reduced to release the strain. This behaviour reducing the GS of the nanocrystals is contrary to what is reported to be the usual when doping with ions that are introduced into the crystal lattice [3]. In the case of the L-tryptophan molecule, the situation is different since the molecule has a dimension of~80 nm.…”

Section: Resultsmentioning

confidence: 57%

“…The band located at~1602 cm −1 could not be identified, but possibly it is a product generated by thiourea. The vibration of the amine group is associated with the bands corresponding to~3414 cm −1 (stretching in 3 Journal of Nanomaterials Journal of Nanomaterials the amine group) (>N-H); that is, -NH 2 groups are generated by the dissociation of the progenitor reagents (NH 4 NO 3 ), and the band at~1632 cm −1 with a small and broad band absorption located at~1920 cm −1 was assigned to one of the fundamental frequency absorptions of O=C-O − anions [3]. An absorption band located at~2376 cm −1 can be seen and assigned to the -C=N bond which could be generated possibly by the hydrolysis of thiourea under alkaline conditions.…”

Section: Resultsmentioning

confidence: 99%

“…This shift in the diffraction lines can be attributed to lattice strain resulting from structural disorder generated by the doping effect. This shift in reflections is usually typical and is associated with the incorporation into the crystal lattice of the dopant ion [3][4][5]10].…”

Section: Resultsmentioning

confidence: 99%

“…This semiconductor has the advantage of modifying its morphological, structural, optical, and electrical properties by means of systematic doping with different cations and anions. Latest reports of doped-PbS nanocrystals with different monovalent and divalent ions and even with three inorganic ions which have been systematically incorporated in the crystal lattice showed the different reasons for investigating this semiconductor in depth according to the interesting changes observed [3,4]. As it is well-known, this semiconductor has been synthesized using various techniques, such as atomic layer deposition [5], SILAR [6], hydrothermal synthesis [7], hot injection method [8], and chemical bath deposition [9].…”

Section: Introductionmentioning

confidence: 99%

“…E g shifts in the range of the spectral region between~0.4 and 3.5 eV when the GS decreases below the size of the excitonic Bohr radius (~18 nm) due to the quantum confinement effect; this is one of the characteristics worthy of investigation in this material. There are several reports that have shown that in doping systematically with different inorganic ions, it is possible to modify the morphological, structural, optical, and electrical properties [3,4,10]. Some other reports of doping with metalorganic compounds in PbS have shown results that attract attention by charge transfer along with structural and optical changes [11], a phenomenon that establishes the importance of doping with different organic molecules.…”

Section: Introductionmentioning

confidence: 99%

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Influence of L-Tryptophan on Growth and Optical Properties of PbS Nanocrystalline Thin Films

Palomino-Merino

Pérez

Trejo-García

et al. 2018

Journal of Nanomaterials

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The growth through the green chemical bath of PbS doped systematically with the biomolecule L-tryptophan led to growth of hybrid, inorganic-organic, nanocrystalline thin films onto glass slides at T~80°C. The thickness was found in the range of 230-140 nm. Morphological changes were analyzed using atomic force microscopy (AFM). FTIR (Fourier-transform infrared spectroscopy) spectra showed broad absorption bands located at~3450 cm −1 attributed to stretching of the H 2 O molecules and two small absorption bands located at~2285 cm −1 and~2918 cm −1 along with a strong band at~1385 cm −1 assigned to vibration modes corresponding to CO 2− 3 ions. In the patterns of X-ray diffraction (XRD), the cubic phase was identified in all the samples according to the angular positions 2θ~26 08°, 30.13°, 43.08°, 51.91°, 53.60°, 6251°, 68.98°, and 71.15°. Using the Scherrer formula on the XRD patterns, the grain size (GS) was determined; for the undoped sample,~42 nm was found, whereas for the doped samples,~42-22 nm was found. The electronic charge distribution of L-tryptophan was determined using the molecular electrostatic potential (MEP) to understand the decrease on the GS associated with the interaction of π electrons from conjugated rings and amino-acid functional groups. The absorbance spectra in doped films showed excitonic peaks at~1.8-2.1 eV associated to a higher energy of the 1 S h → 1 S h and 1 P h → 1 P e electronic transitions. Through optical absorption, a shift for the band gap energy was observed from~1.4 eV for the undoped sample and~2.1-2.3 eV for the doped films, respectively. Such behaviour is generally associated with the GS decrease and the effect of quantum confinement; a simple model by calculating changes in Gibbs free energy (ΔG°) for growth of nanocrystals is presented.

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Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of L-Tryptophan on Growth and Optical Properties of PbS Nanocrystalline Thin Films

Palomino-Merino

Pérez

Trejo-García

et al. 2018

Journal of Nanomaterials

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Quantum Dot Solar Cells

Zhao

Xiang

Huang

et al. 2018

Emerging Photovoltaic Materials

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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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Optical and structural properties of PbSIn3+ nanocrystals grown by chemical bath

Cited by 31 publications

References 29 publications

Influence of L-Tryptophan on Growth and Optical Properties of PbS Nanocrystalline Thin Films

Influence of L-Tryptophan on Growth and Optical Properties of PbS Nanocrystalline Thin Films

Quantum Dot Solar Cells

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

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