Preliminary Observations of Synthesized WS2 and Various Synthesis Techniques for Preparation of Nanomaterials

Yadav, Anukool; Shreya,; Puri, Nitin K.

doi:10.1007/978-981-16-9523-0_61

Cited by 14 publications

(8 citation statements)

References 12 publications

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“…The list of observed vibrational bands are listed in table 4. The peaks at wavenumbers 3449 cm −1 , 3327 cm −1 , 3473 cm −1 and 3473 cm −1 correspond to O-H bond [47][48][49][50]. It is observed that CSD has C-O, C=O, C-H, C=C bonds present at 1217 cm −1 , 1715 cm −1 , 790 cm −1 and 1026 cm −1 positions, respectively [51].…”

Section: Ftirmentioning

confidence: 99%

Fabrication of tunable band gap carbon based zinc nanocomposites for enhanced capacitive behaviour

Dipti,

Phogat,

Shreya

et al. 2023

Phys. Scr.

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This manuscript highlights the tunable properties of carbon nanospheres by controlling the concentration of zinc nitrate in them. Zinc nitrate has converted the phase of carbon spheres, which has also altered the optical, structural and electrochemical properties of carbon nanospheres by forming nanocomposites. Carbon nanospheres and their nanocomposites have been synthesized by using a two-step hydrothermal method. X-ray diffraction analysis of the as synthesized material revealed the formation of carbon spheres and their nanocomposites. It is also observed that the crystallinity of the as synthesized material increases as the concentration of Zn(NO₃)₂.6H2O increases. UV- visible measurements revealed a blue shift in the as-synthesized samples. With the increase in the concentration of zinc, the band gap was also found to increase from 0.6 eV to 4.7 eV. The morphological and microstructural analysis of the as-synthesized samples showed the formation of nanospheres for as-synthesized carbon, and nano flakes for carbon nanocomposites. Fourier-Transform Infrared Spectroscopy (FTIR) measurement provided the information about the molecular structure and vibrational bands present in the samples. Electrochemical analysis of the thin film revealed the capacitive behaviour of the material. The aerial capacitance and Nyquist plot represents the capacitive properties of the material. The present study on carbon nanospheres and their nanocomposites showed that the material is a potential candidate for the application in capacitors, supercapacitors and energy storage devices.

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Section: Ftirmentioning

confidence: 99%

Fabrication of tunable band gap carbon based zinc nanocomposites for enhanced capacitive behaviour

Dipti,

Phogat,

Shreya

et al. 2023

Phys. Scr.

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“…and chalcogen atoms such as sulfur (S), selenium (Se), or tellurium (Te) arranged in a layered structure. 10,11 MoS 2 , WSe 2 , and MoSe 2 are a few commonly studied examples of TMDs. 12,13 TMDs show unique electronic features differing from conventional semiconductors like silicon.…”

Section: Introductionmentioning

confidence: 99%

“…TMDs, one of numerous 2D materials, have drawn tremendous interest in the field of solar cells due to their distinctive electronic properties and high-performance photovoltaic device potential. , They consist of transition-metal atoms like molybdenum (Mo), tungsten (W), rhenium (Re), etc. and chalcogen atoms such as sulfur (S), selenium (Se), or tellurium (Te) arranged in a layered structure. , MoS 2 , WSe 2 , and MoSe 2 are a few commonly studied examples of TMDs. , TMDs show unique electronic features differing from conventional semiconductors like silicon. Their layered structure, held by weak van der Waals forces between neighboring layers and covalent bonds within each layer, results in distinctive physics and features compared to traditional bulk materials .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Shreya,

Phogat,

Jha

et al. 2024

ACS Appl. Nano Mater.

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The hybrid structures of transition-metal dichalcogenides and oxides show enhanced properties by incorporating the qualities of two pristine materials into a single one. In view of this, the present work focuses on synthesizing a series of MoS 2 /WO 3 nanocomposites wherein the molar ratio of MoS 2 to WO 3 was gradually varied to achieve the optimized properties for photovoltaic applications. The samples were analyzed for structural, optical, morphological, microstructural, electrokinetic, electrical, and electrochemical properties. Integrating the properties of MoS 2 and WO 3 provided enhanced properties in the form of wider absorbance range, optimized band gap, better colloidal stability, and increased charge-carrier mobility. The as-synthesized nanocomposites showed the absorbance in UV and visible regions with the band gap varying from 1.3 to 2.66 eV. The zeta potential measurement showed high colloidal stability of some of the nanocomposites with values < −30 mV. Hall effect study of MoS 2 /WO 3 nanocomposites revealed the enhancement in electrical properties, and the mobility is found to be of the order of 880 m 2 /(V s). The redox process was also more prominent for nanocomposite materials as well as enhanced diffusive behavior as analyzed by cyclic voltammetry. The presence of Warburg diffusion along with high-exchange current density was also observed in few samples as analyzed by potentio electrochemical impedance spectroscopy with the highest value of 336 μA. The present study reveals that the catalytic, optical, electrical, and electrochemical properties of MoS 2 /WO 3 nanocomposites can be optimized for solar cell applications by controlling the ratio of constituent materials.

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“…A variety of methods can be employed to synthesize the WO 3 nanoparticles like chemical vapour deposition (CVD), sol-gel, hydrothermal, sonochemical, solvothermal, etc [27,28]. Acid co-precipitation method is one of the numerous methods that can be used to synthesize WO 3.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-mediated modulation of morphology and charge transfer dynamics in tungsten oxide nanoparticles

et al. 2023

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Tungsten Oxide (WO3) is a well-known transition metal oxide which exhibits non-toxicity and stability in its nanoparticle form. It is a potential candidate for a variety of applications due to its low cost and facile synthesis process. In the present work, WO3 nanoparticles were synthesized via facile acid-coprecipitation method to explore the effect of surfactants on the morphology of WO3 nanoparticles and thus, on its structural, optical and electrochemical properties. The morphology analysis revealed the formation of spherical nanoparticles in the absence of any surfactant while nanoflakes and nanosheets were observed in the presence of cetyltrimethylammonium bromide (CTAB) and polyethylene glycol (PEG), respectively. Moreover, the presence of surfactants was found to influence the crystallinity state of the samples. The different morphologies exhibited optical band gap of 2.2-2.7 eV as analyzed by UV-Vis spectroscopy along with other optical properties like absorbance range and refractive index. The electrochemical properties of the samples were studied by employing potentio electrochemical impedance spectroscopy (PEIS) and cyclic voltammetry (CV) techniques. CV analysis revealed the diffusion-controlled behavior of the samples which may be suitable for photovoltaic applications. Furthermore, impedance study showed the presence of Warburg impedance which indicates that there is an infinite layer of excitons on the surface of thin film, further suggesting WO3 as a prominent material for solar cell applications. The incorporation of surfactants resulted in the reduction of charge transfer resistance indicating more efficient charge transfer process.

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Preliminary Observations of Synthesized WS2 and Various Synthesis Techniques for Preparation of Nanomaterials

Cited by 14 publications

References 12 publications

Fabrication of tunable band gap carbon based zinc nanocomposites for enhanced capacitive behaviour

Fabrication of tunable band gap carbon based zinc nanocomposites for enhanced capacitive behaviour

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications

Surfactant-mediated modulation of morphology and charge transfer dynamics in tungsten oxide nanoparticles

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Preliminary Observations of Synthesized WS2 and Various Synthesis Techniques for Preparation of Nanomaterials

Cited by 14 publications

References 12 publications

Fabrication of tunable band gap carbon based zinc nanocomposites for enhanced capacitive behaviour

Fabrication of tunable band gap carbon based zinc nanocomposites for enhanced capacitive behaviour

Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS2/WO3 Nanocomposites for Futuristic Energy Applications

Surfactant-mediated modulation of morphology and charge transfer dynamics in tungsten oxide nanoparticles

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Enhanced Electrochemical Performance and Charge-Transfer Dynamics of 2D MoS₂/WO₃ Nanocomposites for Futuristic Energy Applications