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RISS 인기검색어
- 검색키워드
- 저자 : Majeed Ali Habeeb (검색결과 3 건)
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Ahmed Hashim,Majeed Ali Habeeb 한국전기전자재료학회 2019 Transactions on Electrical and Electronic Material Vol.20 No.2
In this paper, preparation of [carboxyl methyl cellulose (CMC)–polyvinyl pyrrolidone (PVP)–cobalt iron oxides nanoparticles (CoFe 2 O 4 )] nanocomposites for humidity sensors at diff erent temperatures have been investigated. The synthesized humidity sensors have low cost, lightweight, fl exible, high corrosion resistance, high sensitivity compare with other sensors. The structural and optical properties of nanocomposites have been studied. The experimental results of optical properties showed that the absorbance, absorption coeffi cient of (CMC–PVP) blend increase while the transmittance and energy band gap decrease with increase in CoFe 2 O 4 nanoparticles concentrations. The results of humidity sensors showed that the electrical resistance of (CMC–PVP–CoFe 2 O 4 ) nanocomposites decreases with an increase in CoFe 2 O 4 nanoparticles concentrations and temperature. The (CMC–PVP–CoFe 2 O 4 ) nanocomposites have high sensitivity for humidity for diff erent temperatures.
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Tunable electronic and optical properties of GaS/GaSe van der Waals heterostructure
Hamad Rahman Jappor,Majeed Ali Habeeb 한국물리학회 2018 Current Applied Physics Vol.18 No.6
We have used first-principles calculations to investigate the electronic and optical properties of GaS/GaSe van der Waals heterostructures formed by stacking two-dimensional GaSe and GaSe monolayers. Our findings confirm that the GaS/GaSe heterostructures transform from an indirect to a direct band gap material for the two stackings considered in this study. In addition, we found that the direct band gaps are 1.780 eV and 1.736 eV for AA and AB stacking, respectively. It is observed that the behavior of the optical properties of AA stacking is similar to AB stacking with some differences in details and both heterostructures located in UV range. The refractive index values are 2.21 (AA pattern) and 2.18 (AB pattern) at zero photon energy limit and increase to 2.937 for AA and 2.18 AB patterns and both located in the visible region. More importantly, the GaS/GaSe heterostructures have a variety of extraordinary electronic and optical properties. Accordingly, these heterostructures can be useful for the solar cell, nanoelectronics, and optoelectronic applications.
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Rehab Shather Abdul Hamza,Majeed Ali Habeeb 한국전기전자재료학회 2024 Transactions on Electrical and Electronic Material Vol.25 No.1
This work aims to enhance the structure and dielectric characteristics of polyvinyl alcohol (PVA) with carboxymethyl cellulose (CMC)/silicon dioxide (SiO2) and tin oxide (SnO2) nanostructures to be functional in flexible pressure sensors and electronics nanodevices. The PVA–CMC/SiO 2 –SnO 2 nanocomposites were fabricated by casting with various concentrations of (SiO2-SnO2 ) nanoparticles (0, 2, 4, 6, and 8) wt%. The structural and electrical properties of (PVA-CMC-SiO2-SnO2) nanocomposites were studied. The X-ray diffraction (XRD) analysis demonstrated the amorphous state of the blend composed of polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC). Additionally, increased doping levels signifi cantly diminished the intensity of the original polymers’ distinctive peak in the nanocomposite spectrum. The scanning electron microscopy reveals that the top surface of the (PVA-CMC-SiO2-SnO2) NCs films exhibits uniform and cohesive aggregates or fragments distributed randomly when the weight percentage reaches 8%. The application of optical microscopy has enabled the observation that the (SiO2-SnO2) nanoparticles form a cohesive network within the polymer matrix, as opposed to the pure (PVA-CMC) film . The alternating current electrical characteristics show that nanocomposites’ dielectric constant and dielectric loss decrease as the frequency of the applied electrical field rises. However, at the same time, they increase as the concentration of NPs increases . The dielectric constant and A.C. electrical conductivity of (PVA-CMC) blend were enhanced by about 100% and 65%, respectively, when the (SiO2-SnO2) NPs content reached (8 wt%) at a frequency (f = 100 Hz). The results obtained from the study suggest that the incorporation of (SiO2-SnO2) nanoparticles into the doping process (PVA-CMC) led to enhancements in both the structural and electrical properties, which made the (PVA-CMC-SiO2-SnO2) nanostructures promising materials for various electrical nanodevices. The findings of the pressure sensor implementation indicated that the (PVA-CMC-SiO2-SnO2) nanostructures exhibit remarkable pressure sensitivity, exceptional flexibility, and superior environmental durability relative to alternative sensors .
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