Facile synthesis, characterization, and photoluminescence of lamellar α-MoO3 thin films

Ghaleghafi, Elahe; Rahmani, Mohammad

doi:10.1016/j.solidstatesciences.2019.05.022

Cited by 30 publications

(9 citation statements)

References 52 publications

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“…Where A n , n, α, and hν, respectively, stand for the transition's probability parameter, the nature of electronic transition, absorption coefficient, and photon energy. Figure 7(b) shows that the plots of (αhν) 2 versus hν (by assuming n = 2) have a linear character at the absorption edge, confirming a direct allowed transition for electrons [31,43]. As per the extrapolation of the linear part of the plots by taking (αhν) 2 → 0, the estimated E g values for ST35, ST40, ST45, and ST50 were around 2.31, 2.14, 2.33, and 2.36 eV, respectively.…”

Section: Uv-vis Spectroscopymentioning

confidence: 72%

“…All chemicals were used without any further purification. The SP technique was utilized to synthesize hematite films on top of glass substrates [31][32][33]. First, the glass substrates (2.5 × 7.6 cm 2 ) were thoroughly cleaned.…”

Section: Hematite Thin Film Depositionmentioning

confidence: 99%

“…Photoluminescence (PL) analyses are primarily used to study the generation and recombination processes of charge carriers in semiconductors, as well as to assess the efficiency of charge carrier trapping, migration, and transfer [31]. Figure 8 depicts the photoluminescence spectra of the deposited films at different substrate temperatures using a 320 nm excitation wavelength.…”

Section: Photoluminescencementioning

confidence: 99%

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α-Fe₂O₃ thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

Abedi¹,

Rahmani²,

Rezaii³

2023

Phys. Scr.

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In this research, α-Fe2O3 (hematite) thin films were deposited by spray pyrolysis on glass substrates at various growth temperatures of 350, 400, 450, and 500 ℃. Samples were characterized using versatile techniques to study their morphological, structural, and optical properties. X-ray diffraction patterns and Raman spectra confirmed the formation of the hexagonal structure of hematite. Electron microscope images show the growth of cubic nanoparticles on the surface of all synthesized samples, the average size of cubes for the sample with the best sensing performance is about 56.2 nm. Ethanol sensing characteristics of samples were investigated at four elevated temperatures of 175, 200, 225, and 250 ℃, exposed to different concentrations of ethanol. The film deposited at the substrate temperature of 350 ℃ reached the best responses of 30.2% toward 100 ppm and 51.4% toward 1000 ppm of ethanol at the optimum working temperature of 200 ℃. The response and recovery times were recorded at 279 and 536 s, respectively, when this sensor was exposed to 100 ppm ethanol vapor at 200 ℃. A possible mechanism of ethanol sensing is also discussed. This study optimized the growth conditions and sensing parameters of hematite thin films for ethanol sensing applications.

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Section: Uv-vis Spectroscopymentioning

confidence: 72%

Section: Hematite Thin Film Depositionmentioning

confidence: 99%

Section: Photoluminescencementioning

confidence: 99%

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α-Fe₂O₃ thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

Abedi¹,

Rahmani²,

Rezaii³

2023

Phys. Scr.

Self Cite

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“…In the forbidden gap area, Sm 3+ ions may create an impurity band. 84,85 Using Sm incorporation in a-MoO 3 to induce impurity levels suggests that a novel antibonding orbital has been discovered. There were two types of molecular orbitals: bonding and antibonding.…”

Section: Optical Propertiesmentioning

confidence: 99%

Structural, optical, magnetic, and enhanced antibacterial properties of hydrothermally synthesized Sm-incorporating α-MoO₃2D-layered nanoplates

et al. 2022

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“…Intercalation is a unique way to tune the physical properties, including the optical bandgap, of 2D materials through inserting guest species into the van der Waals gaps. [ 15 , 16 ] For example, the tin (Sn) [ 17 ] and cobalt (Co) [ 17 ] intercalation into the wide bandgap molybdenum trioxide ( α ‐MoO 3 ) (about 2.8–3.6 eV) [ 18 ] lead to a strong photo‐response in the visible to infrared broadband regions. Notably, it was found that O 2 molecules will intercalate into the van der Waals gaps of GaTe in air spontaneously, accompanied by a significant bandgap reduction from ≈1.65 to ≈0.8 eV.…”

Section: Introductionmentioning

confidence: 99%

Breaking the Cut‐Off Wavelength Limit of GaTe through Self‐Driven Oxygen Intercalation in Air

et al. 2021

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Low symmetric two dimensional (2D) semiconductors are of great significance for their potential applications in polarization‐sensitive photodetection and quantum information devices. However, their real applications are limited by their photo‐detecting wavelength ranges, which are restricted by their fundamental optical bandgaps. Recently, intercalation has been demonstrated to be a powerful strategy to modulate the optical bandgaps of 2D semiconductors. Here, the authors report the self‐driven oxygen (O2) intercalation induced bandgap reduction from 1.75 to 1.19 eV in gallium telluride (GaTe) in air. This bandgap shrinkage provides the long‐wavelength detection threshold above ≈1100 nm for O2 intercalated GaTe (referred to as GaTeO2), well beyond the cut‐off wavelength at ≈708 nm for pristine GaTe. The GaTeO2 photodetectors have a high photoresponsivity, and highly anisotropic photodetection behavior to even sub‐waveband radiation. The dichroic ratio (Imax/Imin) of photocurrent is about 1.39 and 2.9 for 600 nm and 1100 nm, respectively. This findings demonstrates a broadband photodetector utilizing GaTe after breaking through its bandgap limitation by self‐driven O2 intercalation in air and further reveal its photoconductivity anisotropic nature. This provides design strategies of 2D materials‐based high‐performance broadband photodetectors for the exploration of polarized state information.

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Facile synthesis, characterization, and photoluminescence of lamellar α-MoO3 thin films

Cited by 30 publications

References 52 publications

α-Fe₂O₃ thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

α-Fe₂O₃ thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

Structural, optical, magnetic, and enhanced antibacterial properties of hydrothermally synthesized Sm-incorporating α-MoO₃2D-layered nanoplates

Breaking the Cut‐Off Wavelength Limit of GaTe through Self‐Driven Oxygen Intercalation in Air

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Facile synthesis, characterization, and photoluminescence of lamellar α-MoO3 thin films

Cited by 30 publications

References 52 publications

α-Fe2O3 thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

α-Fe2O3 thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

Structural, optical, magnetic, and enhanced antibacterial properties of hydrothermally synthesized Sm-incorporating α-MoO32D-layered nanoplates

Breaking the Cut‐Off Wavelength Limit of GaTe through Self‐Driven Oxygen Intercalation in Air

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Product

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α-Fe₂O₃ thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

α-Fe₂O₃ thin films deposited by a facile spray pyrolysis technique for enhanced ethanol sensing

Structural, optical, magnetic, and enhanced antibacterial properties of hydrothermally synthesized Sm-incorporating α-MoO₃2D-layered nanoplates