Preparation and optical studies of PbS nanoparticles

Mamiyev, Zamin; Balayeva, Narmina O.

doi:10.1016/j.optmat.2015.05.017

Cited by 86 publications

(28 citation statements)

References 23 publications

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“…The absorbance spectra of PbS-PbS-T nanocrystals exhibited low absorption bands (bands shown in green and blue color) located at~225 nm (~5.5 eV),~352 nm (~3.6 eV), 501 nm (2.4 eV),~589 nm (~2.1 eV),~618 nm (~2.0 eV),~665 nm (~1.8 eV),~774 nm (~1.6 eV), and~789 nm (~1.5 eV) due to a strong confinement effect [3-6, 10, 28]. It can be seen that PbS exhibited a strong and sharp absorption band located at~352 nm (~3.6 eV), which is fairly blue-shifted from the absorption edge of bulk PbS (~3020 nm) already reported [29], because the UV absorption decreases dramatically below the wavelength corresponding to the band edge. It has been reported that this kind of band edge luminescence arises from the recombination of excitons shallowly trapped in electronhole pairs [30].…”

Section: Resultsmentioning

confidence: 63%

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: 63%

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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“…As previous report, nanosized semiconducting materials usually exhibit a wide range of electrical and optical properties that depend sensitively on both morphologies and sizes 9 . Hence, much attentions have been paid on synthesis of a variety of PbS nanostructures, such as nanoparticles 10 3 24 . Ethanol detection are great important in many fields including control of fermentation processes, safety testing of food packaging, and monitoring drunken driving etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Star-Shaped Lead Sulfide (PbS) Nanomaterials and theirs Gas-Sensing Properties

et al. 2016

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Star-shaped PbS nanomaterials are synthesized by a hydrothermal method. Morphology and structure of the PbS nanomaterials are analyzed by SEM, HRTEM and XRD. Gas-sensing properties of the as-prepared PbS sensor are also systematically investigated. The results show star-shaped PbS nanostructure consists of four symmetric arms in the same plane and demonstrate good crystallinity. With the increase of ethanol concentration, the sensitivity of the PbS sensor significantly increases and demonstrates an almost linear relationship at the optimal operating temperature of 400 o C. Moreover, the fast response-recovery towards ethanol is also observed, which indicates its great potential on ethanol detection.

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“…Therefore, it is a promising material for infrared detector, high-performance infrared phototransistor, and laser source [2][3][4]. PbS is a semiconductor with a large exciton Bohr radius of 18 nm, which permits size-quantum confinement effects to be clearly visible, even for large particles.…”

Section: -Introductionmentioning

confidence: 99%

“…PbS nanostructures can also be used as a multiple exciton generation (MEG), in which the impact of a single photon produces two or more excitons. This phenomenon has raised the possibility of quantum dot based solar cells with high photo-conversion efficiency and photonic device applications as well as gas sensor [4][5][6][7]. However, efficiency of these nanostructures for optoelectronic applications is very important that should be taken into account.…”

Section: -Introductionmentioning

confidence: 99%

Effect of annealing temperature and graphene concentrations on photovoltaic and NIR-detector applications of PbS/rGO nanocomposites

Yousefi

Mahmoudian

́aedi

et al. 2016

Ceramics International

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Preparation and optical studies of PbS nanoparticles

Cited by 86 publications

References 23 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

Synthesis of Star-Shaped Lead Sulfide (PbS) Nanomaterials and theirs Gas-Sensing Properties

Effect of annealing temperature and graphene concentrations on photovoltaic and NIR-detector applications of PbS/rGO nanocomposites

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