Correlation between Particle Size, Strain and Band Gap of Iron Oxide Nanoparticles

Deotale, Anjali Jain; Nandedkar, R. V.

doi:10.1016/j.matpr.2016.04.110

Cited by 116 publications

(52 citation statements)

References 13 publications

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“…When Fe 2 O 3 added on chitosan, the band gap became lower as compared to the individual band gap. It can be due to the increased of crystallite size attributed to the confinement effects that related to the rise amount of orbitals participating in the formation of valence bands and covalent bands through orbital overlap [ 75 ]. Thus, this showed that defects and confinement effects have a huge impact on the optical properties of a composite.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

et al. 2020

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In this study, synthesis and characterization of chitosan/maghemite (Cs/Fe2O3) composites thin film has been described. Its properties were characterized using Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and ultraviolet-visible spectroscopy (UV-Vis). FTIR confirmed the existence of Fe–O bond, C–N bond, C–C bond, C–O bond, O=C=O bond and O–H bond in Cs/Fe2O3 thin film. The surface morphology of the thin film indicated the relatively smooth and homogenous thin film, and also confirmed the interaction of Fe2O3 with the chitosan. Next, the UV-Vis result showed high absorbance value with an optical band gap of 4.013 eV. The incorporation of this Cs/Fe2O3 thin film with an optical-based method, i.e., surface plasmon resonance spectroscopy showed positive response where mercury ion (Hg2+) can be detected down to 0.01 ppm (49.9 nM). These results validate the potential of Cs/Fe2O3 thin film for optical sensing applications in Hg2+ detection.

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Section: Resultsmentioning

confidence: 99%

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

et al. 2020

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Section: Resultsmentioning

confidence: 99%

“…It is well known that in semiconductors, by decreasing particle size, band gap increases due to the quantum confinement effect . But in the case of nanoparticles embedded in a matrix, some other factors may affect the band gap such as surrounding matrix effect, surface and interface condition, surface pressure and lattice strain .…”

Section: Resultsmentioning

confidence: 99%

“…So in this research, decreasing the band gap of extremely small BiOI0.2 NPs could be attributed to increasing the surface pressure. Actually, by increasing the surface pressure of BiOI0.2 NPs, the lattice strain in the sample increases leading to reduction in BiOI0.2 NPs band gap . Also, the interface effects of PVP matrix and surface conditions of the sample may counteract the influence of quantum confinement .…”

Section: Resultsmentioning

confidence: 99%

“…Deotale and Nandedkar claimed that the band gap of very small nanoparticles is affected by the pressure surface effect, so that for very small size nanoparticles, surface pressure and lattice strain increase leading to band-gap reduction (53). Also, Nanda et al reported that in the case of semiconductor nanoparticles embedded in a matrix, the surface and interface effects of surrounding matrix may influence the value of band gap (52).…”

Section: Characterization Of Photocatalystsmentioning

confidence: 99%

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Facile Synthesis of BiOI Nanoparticles at Room Temperature and Evaluation of their Photoactivity Under Sunlight Irradiation

Mahmoodi

Ahmadpour

Bastami

et al. 2017

Photochem & Photobiology

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In this study, highly photoactive BiOI nanoparticles (NPs) under sunlight irradiation were synthesized by a facile precipitation method using polyvinylpyrrolidone (PVP) at room temperature. The as-prepared catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transition electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) and UV-vis diffuse reflectance spectra (UV-vis DRS). The results of XRD showed that PVP did not have any significant effect on tetragonal crystalline structure of BiOI. Also, using different amounts of PVP in the synthesis led to different morphologies and sizes of BiOI particles. It was found that using 0.2 g of PVP in the synthesis method changed morphology from 1-μm platelets to NPs with size under 10 nm. In addition, the photocatalytic performance of prepared photocatalysts was evaluated in the photodegradation of reactive blue 19 (RB19) dye under sunlight irradiation. The BiOI synthesized using 0.2 g PVP (BiOI0.2) showed higher degradation efficiency compared to BiOI prepared without any additive. Excellent visible light photocatalytic properties of nano-scaled BiOI0.2 samples compared to BiOI platelets could be attributed to higher surface-to-volume ratio and narrow band-gap energy of as-prepared BiOI0.2 NPs.

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Enhanced Charge Separation and Transfer of Fe₂O₃@Nitrogen‐Rich Carbon Nitride Tubes for Photocatalytic Water Splitting

et al. 2020

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Carbon nitride is widely used in photocatalytic hydrogen production, but it is still difficult to split water without any sacrificial reagent. Herein, nanosized Fe2O3 is combined with 3D nitrogen‐rich carbon nitride tubes (ACN), to form an Fe2O3@ACN Z‐scheme heterojunction, which accelerates the electrons’ transfer from Fe2O3 to ACN and improves the charge separation efficiency. Meanwhile, the bandgap of Fe2O3@ACN is about 2.01 eV, beneficial to the enhancement of visible light absorption capacity. As a result, without any sacrificial agent, the hydrogen evolution rate reaches 3.7 μmol h−1 (10 mg catalyst, AM1.5) through water splitting, which is three times that of ACN and 45 times that of bulk C3N4 (GCN). This work provides a new strategy to prompt pure water splitting based on carbon nitride catalysts.

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Correlation between Particle Size, Strain and Band Gap of Iron Oxide Nanoparticles

Cited by 116 publications

References 13 publications

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Facile Synthesis of BiOI Nanoparticles at Room Temperature and Evaluation of their Photoactivity Under Sunlight Irradiation

Enhanced Charge Separation and Transfer of Fe₂O₃@Nitrogen‐Rich Carbon Nitride Tubes for Photocatalytic Water Splitting

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Correlation between Particle Size, Strain and Band Gap of Iron Oxide Nanoparticles

Cited by 116 publications

References 13 publications

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Facile Synthesis of BiOI Nanoparticles at Room Temperature and Evaluation of their Photoactivity Under Sunlight Irradiation

Enhanced Charge Separation and Transfer of Fe2O3@Nitrogen‐Rich Carbon Nitride Tubes for Photocatalytic Water Splitting

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Enhanced Charge Separation and Transfer of Fe₂O₃@Nitrogen‐Rich Carbon Nitride Tubes for Photocatalytic Water Splitting