Investigation and Comparison of Optical and Raman Bands of Mechanically Synthesised MoO3 Nano Powders

Krishna, A. Murali; Ravikumar, R.V.S.S.N.; Kumar, T. Vijaya; Ephraim, S. Daniel; Ranjith, B.; Pranoy, M.; Sundeep, Dola

doi:10.1016/j.matpr.2016.01.121

Cited by 28 publications

(12 citation statements)

References 29 publications

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“…The peak at approximately 1358 cm −1 was assigned to the vibration mode of the Mo–OH bond whereas the peak at 1631 cm −1 was associated with the δ (O-H) vibration of adsorbed water 17 . As for the absorption peaks between 478 and 650 cm −1 were because of the stretching vibration of the O atom link to three Mo atoms 17 , 18 , 21 .…”

Section: Resultsmentioning

confidence: 97%

“…Whereas, there was an intense endothermic peak at about 795 °C in the DTA curve which was corresponding to the temperature of melting point of α-MoO 3 . At this temperature, there was a dramatic weight loss of about 57.27% in the TG curve, resulted from the sublimation of MoO 3 21 , 28 . Similarly, fibrous products with α-MoO 3 millimeter-belts had similar results (Fig.…”

Section: Resultsmentioning

confidence: 98%

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Single-Crystal MoO3 Micrometer and Millimeter Belts Prepared from Discarded Molybdenum Disilicide Heating Elements

Hou

Huang

Liu

et al. 2018

Sci Rep

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Single-crystal MoO3 micrometer to millimeter even centimeter belts were prepared via a novel route of oxidizing a discarded molybdenum disilicide heating element at 1000 °C for 3 h. The morphology and structure features, and growth mechanism of the products were evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The results indicated that the powdery and fibrous products were typical α-MoO3 belt-like structures which size could develop from micrometer to several millimeter even centimeter in length and up to 0.5 mm in width. It should be formed preferentially along the [001] direction via layer by layer growth to form 1-D single MoO3 belts by vapor-solid mechanism. Thermal and luminescence properties of the products were revealed by thermogravimetric analysis and differential thermal analysis and photoluminescence spectra that the resultant α-MoO3 belts had good thermal stability and characteristics of luminescence with a central peak at 481 nm. The MoO3 belts are of good potential being applied to luminescent and high temperature devices.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Single-Crystal MoO3 Micrometer and Millimeter Belts Prepared from Discarded Molybdenum Disilicide Heating Elements

Hou

Huang

Liu

et al. 2018

Sci Rep

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“…X-ray diffraction is a powerful tool used to estimate the crystalline size, lattice strain and dislocation densities. The average crystalline size of the prepared samples was calculated using the Debye–Scherrer’s formula given in the following equation (Sundeep et al 2016 ; Gopala Krishna et al 2016 ; Ravikumar et al 2016 ) where ‘ D ’ is the crystalline size; λ is the wavelength of X-ray ( λ = 0.154056 nm for (CuKα); β is the full width at half maximum (FWHM) of the Braggs peak (in radians); θ is the diffraction angle of the reflection.…”

Section: Resultsmentioning

confidence: 99%

Green synthesis and characterization of Ag nanoparticles from Mangifera indica leaves for dental restoration and antibacterial applications

et al. 2017

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Green synthesis has gained a wide recognition as clean synthesis technique in the recent years. In the present investigation, silver nanoparticles were prepared by a novel green synthesis technique using Mangifera indica (Mango leaves) and found to be successfully used in dental applications. The prepared samples were spectroscopically characterized by XRD, PSA, SEM with EDS, and UV–Vis spectroscopy. The crystalline size and lattice strain were analyzed from the XRD data which were counter-verified by W–H plots and particle size analyzer. The XRD peaks revealed that average crystalline size of the as-synthesized Ag nanoparticles was of 32.4 nm with face-centered cubic structure. This was counter-verified by particle size analyzer and Williamson–Hall plots and found to be 31.7 and 33.21 nm in the former and latter, and the crystalline size of Ag NPs could be concluded as 32 ± 2 nm. The morphological structure of the prepared sample was studied through SEM images and the chemical composition was analyzed by the EDS data. The band energy was calculated as 393 nm from UV–Vis, which confirmed the synthesized sample as Ag nanoparticles. To improve the mechanical bonding and hardness of the dentally used glass ionomer cement (GIC), the synthesized silver nanoparticles were incorporated into GIC in 2% weight ratio. The morphology of the prepared specimens was studied using optical microscope images. Vickers microhardness and Monsanto hardness tests were performed on GIC, GIC reinforced with microsilver particles and GIC reinforced with nanosilver particles and the latter derived a promising results. The results of the Monsanto tests confirmed the increase in hardness of the GIC reinforced with AgNps as 14.2 kg/cm2 compared to conventional GIC and GIC reinforced with silver microparticle as 11.7 and 9.5 kg/cm2. Similarly the Vickers hardness results exhibited the enhanced hardness of GIC-reinforced AgNps as 82 VHN compared to GIC as 54 and GIC-reinforced silver microparticles as 61 VHN. The antibacterial activity of AgNPs was tested by a well-diffusion method on Escherichia coli and Staphylococcus aureus bacteria, and the obtained results exhibited a promising antibacterial activity of the as-synthesized nanoparticles.

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“…Microstrain may be induced in the sample due to crystal imperfection and distortion, which may be calculated using Eq. (1) [34].…”

Section: Photocatalytic Studiesmentioning

confidence: 99%

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Basnet

Samanta

Chanu³

et al. 2019

SN Appl. Sci.

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Tuning the photocatalytic property of zinc oxide (ZnO) nanoparticles (NPs) is timely. Dependence of photocatalysis upon size, morphology and effective surface area of the particles used has led to optimization in various synthesis procedures. The current article addresses to dictate a cost-effective, bio-friendly, modified ease-process for this issue. The synthesis of ZnO NPs with differing photophysical properties, sizes and morphologies, in order to tune its photocatalytic activity, have been extensively studied. Polyethylene glycol as the structure directing agent and different synthesis strategies were adopted. Spectroscopic and microscopic characterization techniques were employed to understand the nature of the as-synthesized samples. Photocatalytic property and photostability of the samples were determined based on experiments performed with common xanthene and azo dyes. Based on analysing the results, certain characteristics, such as smaller particle size, less agglomerated structure, higher surface area and superior lifetime of the photogenerated electrons and holes upon light illumination, were essential for ZnO NPs to act as an efficient photocatalyst.

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Investigation and Comparison of Optical and Raman Bands of Mechanically Synthesised MoO3 Nano Powders

Cited by 28 publications

References 29 publications

Single-Crystal MoO3 Micrometer and Millimeter Belts Prepared from Discarded Molybdenum Disilicide Heating Elements

Single-Crystal MoO3 Micrometer and Millimeter Belts Prepared from Discarded Molybdenum Disilicide Heating Elements

Green synthesis and characterization of Ag nanoparticles from Mangifera indica leaves for dental restoration and antibacterial applications

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

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