Electrical and optical properties of nanocrystalline lead sulphide thin films prepared by chemical bath deposition

Hussain, Amir; Begum, A.; Rahman, A.

doi:10.1007/s12648-012-0130-2

Cited by 34 publications

(9 citation statements)

References 25 publications

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“…In this way, three sets of Ni-doped (1.5 wt%, 2 wt% and 2.5 wt%) nanocrystalline Bi 2 S 3 thin films are deposited on Fluorine doped tin oxide (FTO) substrates by chemical bath deposition technique. The type of electrical conductivity is determined by simple hot probe method as discussed in our earlier paper [31]. The reported work function of FTO is 4.4 eV [32] which is lower than the work function of Bi 2 S 3 4.93 eV [33].…”

Section: Methodsmentioning

confidence: 99%

Electrical and photovoltaic characteristics of Ni/(n)Bi2S3 Schottky barrier junction

Hussain

Rahman

2015

Superlattices and Microstructures

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Section: Methodsmentioning

confidence: 99%

Electrical and photovoltaic characteristics of Ni/(n)Bi2S3 Schottky barrier junction

Hussain

Rahman

2015

Superlattices and Microstructures

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“…In the same procedure as discussed above, nanocrystalline CdSe thin films of another four sets of thin films at different reactant concentrations by keeping constant pH value 8 and deposition temperature 298K are prepared and to study their effects optical and electrical properties. The average thickness of the film is measure by the Tolansky method [11]. The optical characteristics are studied by using Carry-300 scan UV-Visible spectrophotometer.…”

Section: Preparation Of Nanocrystalline Cdse Thin Films In Pva Matrixmentioning

confidence: 99%

Studies on optical and electrical properties of PVA capped nanocrystalline CdSe thin film prepared by chemical bath deposition method

Devi¹,

Saikia²,

Hussain³

2022

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PVA-capped nanocrystalline CdSe thin films are deposited on chemically clean glass substrates by chemical bath deposition technique using Cadmium acetate [Cd(CH3COO)2.3H2O and Sodium Selenosulfate (Na2SeSO3) as Cd2+ and Se2- ions sources respectively. Polyvinyl Alcohol (PVA) is act as a capping agent. Films of five different molarities (0.1 M–0.50M) of same pH value 8 were prepared at room temperature 298 K. The characteristics of the prepared CdSe thin films are investigated in detail by measuring their optical and electrical properties. The band gap energy of 2.16–2.49 eV was determined from the optical absorption spectra. The optical band gap decrease with increase in molarities. The electrical conductivity measured using two co-planar Aluminium electrodes are found to increase with increase in temperature showing semiconducting nature of the films. The electrical conductivity at room temperature is found to be of the order of 10-4 Ω-1 cm-1 .

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“…In the 2D materials family, an appreciable amount of focus has been on transition metal chalcogenides as the use of transition metal allows a degree of control over the oxidation state of the metal in the final material . For instance, molybdenum sulfide (MoS 2 ), tungsten sulfide (WS 2 ), cobalt sulfide (CoS 2 ), lead sulfide (PbS), or zinc sulfide (ZnS) have all been reported for their applicability in promoting catalytic reactions. ,− Of these, cobalt sulfide with the chemical formula Co x S y is interesting as this material can be fabricated in different stoichiometric and non-stoichiometric phases where each is known to exhibit unique electrical, magnetic, and optical properties. − Although Co x S y is an interesting material, it is to be noted that much of the work so far has focused on their potential application in batteries and supercapacitors . Recent years have seen their applicability for catalysis including nitrophenol reduction, oxygen reduction, and oxygen evolution reactions. − These studies specifically suggest that the Co 3 S 4 phase demonstrates a rich catalytic property. ,, However, phase pure 2D Co 3 S 4 nanosheets have not been previously employed to mimic the catalytic activity of natural enzymes.…”

Section: Introductionmentioning

confidence: 99%

Cobalt Sulfide Nanosheets as Peroxidase Mimics for Colorimetric Detection of l-Cysteine

Hashmi

Singh

Weerathunge

et al. 2021

ACS Appl. Nano Mater.

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The rich chemical, physical, electronic, and surface properties of two-dimensional (2D) materials have witnessed an explosion of research leading to enrichment in the 2D family of materials. Cobalt sulfide (Co x S y ), a transition metal chalcogenide, has attracted significant interest as its different stoichiometric and non-stoichiometric phases offer diverse properties. To date, the Co3S4 phase has seen limited developments with recent reports suggesting good catalytic properties of this material. In the current study, we show the facile synthesis of phase pure 2D Co3S4 nanosheets using a hydrothermal approach and demonstrate the importance of the chemical reactivity of the surface atoms in achieving target selectivity during sensing. First, the catalytic activity of Co3S4 nanosheets was observed to follow Michaelis–Menten kinetics, suggesting that the nanosheets mimic the catalytic activity of the natural peroxidase enzymes. The presence of dangling sulfur atoms on the surface of the Co3S4 nanosheets allowed them to specifically interact with l-cysteine amino acid that resulted in the temporary loss of its catalytic activity. This interaction allowed us to develop a “turn-off” colorimetric sensor to detect l-cysteine even in complex mixtures of amino acids and other sulfur containing compounds. In-depth understanding of the sensor mechanism revealed a reversible competition between l-cysteine and peroxidase substrates for binding to the Co3S4 nanosheets. Due to the higher affinity of l-cysteine to the nanosheets, it first binds to the Co3S4 nanosheets blocking its nanozyme activity. Subsequently, the outstanding catalytic activity of 2D Co3S4 nanosheets assists in the oxidation of l-cysteine, and as oxidized products leave the nanozyme surface, its catalytic activity resumes. The findings of our study are likely to instigate further research into the exploration of the chemical reactivity of 2D surfaces for diverse applications.

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Electrical and optical properties of nanocrystalline lead sulphide thin films prepared by chemical bath deposition

Cited by 34 publications

References 25 publications

Electrical and photovoltaic characteristics of Ni/(n)Bi2S3 Schottky barrier junction

Electrical and photovoltaic characteristics of Ni/(n)Bi2S3 Schottky barrier junction

Studies on optical and electrical properties of PVA capped nanocrystalline CdSe thin film prepared by chemical bath deposition method

Cobalt Sulfide Nanosheets as Peroxidase Mimics for Colorimetric Detection of l-Cysteine

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