Influence of pH on particle size, band-gap and activation energy of CdS nanoparticles synthesized at constant frequency ultrasonic wave irradiation

Mohanraj, V.; Jayaprakash, R.; Chandrasekaran, J.; Robert, R.; Sangaiya, P.

doi:10.1016/j.mssp.2017.04.006

Cited by 24 publications

(9 citation statements)

References 21 publications

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“…As shown in Fig. 3, the increase in the pH of the environment causes the loss of the leaflike morphology, causing CuO particles to form small particles agglomerated in a flower-like morphology, causing an increase in the Egap [47]. The use of EDA as a surfactant prevents the loss of the leaflike morphology, providing only a small decrease in particle size, which results in a minimal variation in Egap.…”

Section: Insert Figmentioning

confidence: 99%

Influence of pH on the morphology and photocatalytic activity of CuO obtained by the sonochemical method using different surfactants

Neto

Oliveira

Nascimento

et al. 2019

Ceramics International

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Section: Insert Figmentioning

confidence: 99%

Influence of pH on the morphology and photocatalytic activity of CuO obtained by the sonochemical method using different surfactants

Neto

Oliveira

Nascimento

et al. 2019

Ceramics International

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“…Cadmium is an electroactive metal with significant properties that is used extensively in batteries . Whenever the names of inorganic conductors and semiconductors are implied, ZnO and CdS are the most important species. − On the other hand, surface area and particle size also have a significant effect on their performance . All of the observations led us to design a Cd sorbent of zinc based MOF that simultaneously has medium sized pores (not very big), Zn–O connections, Cd–S or Cd–N interactions, and organic ligands containing the π linkage.…”

Section: Introductionmentioning

confidence: 99%

“…25−27 On the other hand, surface area and particle size also have a significant effect on their performance. 28 All of the observations led us to design a Cd sorbent of zinc based MOF that simultaneously has medium sized pores (not very big), Zn−O connections, Cd−S or Cd−N interactions, and organic ligands containing the π linkage.…”

Section: ■ Introductionmentioning

confidence: 99%

Highly Electroconductive Metal–Organic Framework: Tunable by Metal Ion Sorption Quantity

2019

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This study has developed a simple and innovative approach to design a metal–organic framework (MOF) with tunable conductivity. The in situ amine functionalized TMU-60 [Zn(OBA)(L*)·DMF] has the potential of converting to a conductor due to the selective and fast sorption of cadmium ion. In order to precisely monitor the cadmium penetration to the framework pores, in addition to full kinetic and thermodynamic studies of sorption, the time-dependent effects of Cd(II) penetration to MOF pores was taken by fluorescence and electrochemical methods. The results obviously prove that the conductivity of the structure can be adjusted by changing the Cd exposure time and the quantity of ion sorption. The presence of cadmium ions can enhance the ability of the framework to pass electrons through its constituents. Even though the porosity of the structure remains to a certain extent, the achieved tunable and highly stable electrical conductivity is provided by sorption of metal ions. More importantly, the conductivity has been improved from 53 × 10–6 to 1.8 × 10–2 S·cm–1 for TMU-60 and TMU-60-Cd compressed pellet (room temperature), respectively. The mechanism of charge transport through the pellet is proposed to be a hopping mechanism between metal nodes and localized Cd(II) after sorption, which is supported by chronoamperometry measurement. A fit of the time-dependent data to the Cottrell equation gave a charge-transport diffusion coefficient of 1.6 × 10–10 cm2/s throughout the structure. This novel approach not only enhances the conductivity of the MOF but also allows adjusting the conductivity according to the desired applications.

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“…The relationship between the band gap energy (E g ) and the crystallite size (a) of a nanoparticle is given by equation ( 6) as [32][33][34] :…”

Section: Mechanisms Of Band Gap Enhancementsmentioning

confidence: 99%

“…Moreover, the band gap energy (E g ) for the hexagonal nanoparticles like the α-Ni(OH) 2 materials studied in the present work is given by equation ( 7) as [32][33][34] :…”

Section: Mechanisms Of Band Gap Enhancementsmentioning

confidence: 99%

Optical band gap enhancements of chemically synthesized α‐Ni(OH)₂ nanoparticles by a novel technique: Precipitator molarity variation

et al. 2022

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Nickel hydroxide nanoparticles (NHNPs) are extremely important semiconducting materials for applications in energy storage and energy harvesting devices. This study uses a novel variation in molarity of the sodium hydroxide (NaOH) precipitator solution to enhance the direct optical band gap in the NHNPs chemically synthesized by using nickel nitrate hexahydrate (Ni(NO 3 ) 2 Á6H 2 O) as the precursor. The simple, energy benign chemical precipitation route involved the usage of 1 M (Ni (NO 3 ) 2 Á6H 2 O) solutions as the precursor and 0.4 M, 0.6 M, and 0.8 M NaOH solutions as the precipitator solutions. The simple variation in precipitator molarity induces an increase in pH from about 6.9 to 7.5 of the reactant solution. As the molarity of the precursor solution does not change, the change in pH of the reactant solution is equivalent to the change in the pH of the precipitator solution. The NHNPs characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), dynamic light scattering (DLS), Fourier-transform infrared (FTIR) and ultraviolet-visible (UV-vis) techniques confirm a reduction of the nanocrystallite size from about 6.8 to 4.5 nm with a concomitant enhancement in the direct optical band gap energy from about 2.64 to 2.74 eV. The possible mechanisms that could be operative behind obtaining microstructurally tuned (MT)-NHNPs and band gap engineering (BGE) of the MT-NHNPs are discussed from both theoretical and physical process perspectives. Further, the implications of these novel results for possible future applications are briefly touched upon. The reported results might be useful to assess the material as an active electrode to improve the performance of batteries.

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Influence of pH on particle size, band-gap and activation energy of CdS nanoparticles synthesized at constant frequency ultrasonic wave irradiation

Cited by 24 publications

References 21 publications

Influence of pH on the morphology and photocatalytic activity of CuO obtained by the sonochemical method using different surfactants

Influence of pH on the morphology and photocatalytic activity of CuO obtained by the sonochemical method using different surfactants

Highly Electroconductive Metal–Organic Framework: Tunable by Metal Ion Sorption Quantity

Optical band gap enhancements of chemically synthesized α‐Ni(OH)₂ nanoparticles by a novel technique: Precipitator molarity variation

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Influence of pH on particle size, band-gap and activation energy of CdS nanoparticles synthesized at constant frequency ultrasonic wave irradiation

Cited by 24 publications

References 21 publications

Influence of pH on the morphology and photocatalytic activity of CuO obtained by the sonochemical method using different surfactants

Influence of pH on the morphology and photocatalytic activity of CuO obtained by the sonochemical method using different surfactants

Highly Electroconductive Metal–Organic Framework: Tunable by Metal Ion Sorption Quantity

Optical band gap enhancements of chemically synthesized α‐Ni(OH)2 nanoparticles by a novel technique: Precipitator molarity variation

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Product

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Optical band gap enhancements of chemically synthesized α‐Ni(OH)₂ nanoparticles by a novel technique: Precipitator molarity variation