Enhancement of gas response of annealed ZnO film for hydrogen gas detection

Thamir A.A. Hassan

doi:10.30723/ijp.v12i23.341

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Publication Date

Mon Feb 18 2019

Journal Name

Iraqi Journal Of Physics

Volume

12

Issue Number

23

DOI

10.30723/ijp.v12i23.341

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Enhancement of gas response of annealed ZnO film for hydrogen gas detection

RF-sputtering

Zinc oxide

Gas sensor

Oxygen-vacancy model.

Thamir A.A. Hassan

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The mechanism of hydrogen (H₂) gas sensor in the range of 50-200 ppm of RF-sputtered annealed zinc oxide (ZnO) and without annealing was studied. The X-ray Diffraction( XRD) results showed that the Zn metal was completely converted to ZnO with a polycrystalline structure. The I–V characteristics of the device (PT/ZnO/Pt) measured at room temperature before and after annealing at 450 ^oC for4h, from which a linear relationship has been observed. The sensors had a maximum response to H₂ at 350 ^oC for annealing ZnO and showed stable behavior for detecting H₂ gases in the range of 50 to 200 ppm. The annealed film exhibited higher response than the film without annealing.. The sensing mechanism was modeled according to the oxygen–vacancy model.

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Publication Date

Mon May 04 2020

Journal Name

Offshore Technology Conference

Hydrate Equilibrium Model for Gas Mixtures Containing Methane, Nitrogen and Carbon Dioxide

gas hydrate

cavity

equilibrium condition

flow assurance

modeling & simulation

hydrate equilibrium condition

upstream oil & gas

cage occupancy

hydrate

gas mixture

Dhifaf Jaafar

Omar

Stefan

Maxim

Callum

Ahmed

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Abstract<p>Gas hydrate formation is considered one of the major problems facing the oil and gas industry as it poses a significant threat to the production, transportation and processing of natural gas. These solid structures can nucleate and agglomerate gradually so that a large cluster of hydrate is formed, which can clog flow lines, chokes, valves, and other production facilities. Thus, an accurate predictive model is necessary for designing natural gas production systems at safe operating conditions and mitigating the issues induced by the formation of hydrates. In this context, a thermodynamic model for gas hydrate equilibrium conditions and cage occupancies of N2 + CH4 and N2 + CO4 gas mix</p> ... Show More

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(7)

Publication Date

Wed Jan 01 2003

Journal Name

Turkish Journal Of Chemistry

Gas Chr Gas Chromatographic Separ aphic Separation of Phenol Deriv ation of Phenol Derivatives by Schiff- y SchiffBase Liquid Crystalline Stationary Phases

gas chromatograph

liquid crystalline

Mohammed Ali

Abdul-Muhsin Abdul-Hameed

Maha Tahir Sultan

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The chromatographic behaviour of liquid crystalline compounds benzylidene-p-aminobenzoic acid and 4-(p-methyl benzylidene)-p-aminobenzoic acid as stationary phases for the separation of dimethylphenol isomers was investigated. These isomers were analysed on benzylidene-p-aminobenzoic acid within a nematic range of 169-194 ◦C with a temperature interval of 5 ◦C. Better peak resolution was at a column temperature of 190 ◦C. The analysis was repeated on a 4-(p-methyl benzylidene)-p-aminobenzoic acid column at a nematic temperature of 256 ◦C, which represented the end of the nematic range, and gave the optimum peak resolution. It was found that isomer better separation was obtained at 20% loading for both liquid crystal materials. Other

Publication Date

Sat Jan 01 2022

Journal Name

Journal Of Petroleum Science And Engineering

Performance evaluation of analytical methods in linear flow data for hydraulically-fractured gas wells

Hydraulic fracturing

Shale gas reservoirs

Tight gas reservoirs

Unconventional reservoirs

Fracture half-length

Petroleum engineering

Atheer

Huda

Dheiaa

Omar

Mofazzal

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(8)

Publication Date

Sat Jun 30 2001

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Gas Holdup in a Bubble Column

A'amer Hameed

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Publication Date

Fri Dec 01 2023

Journal Name

Chemical Methodologies

Investigations on TiO<inf>2</inf>-NiO@In<inf>2</inf>O<inf>3</inf> Nanocomposite Thin Films (NCTFs) for Gas Sensing: Synthesis, Physical Characterization, and Detection of NO<inf>2</inf> and H<inf>2</inf>S Gas Sensors

M.A.

Fuad Tariq

S.

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(15)

Publication Date

Mon Oct 01 2018

Journal Name

Iraqi Journal Of Physics

Synthesis of gold nanoparticles by laser ablation on porous silicon for sensing CO2 gas

Porous silicon

gold nanoparticle

electrical properties

gas sensing. Article

Uday Muhsin

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In this research, porous silicon (PS) prepared by anodization etching on surface of single crystalline p-type Si wafer, then Gold nanoparticle (AuNPs) prepared by pulsed laser ablation in liquid. NPs deposited on PS layer by drop casting. The morphology of PS, AuNPs and AuNPs/PS samples were examined by AFM. The crystallization of this sample was characterized by X-ray diffraction (XRD). The electrical properties and sensitivity to CO2 gas were investigated to Al/AuNPs/PS/c-Si/Al, we found that AuNPs plays crucial role to enhance this properties.

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(3)

Publication Date

Mon Aug 10 2020

Journal Name

Journal Of Petroleum Exploration And Production Technology

Geomechanical modelling and two-way coupling simulation for carbonate gas reservoir

Barzan I.

M S

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Abstract<p>Geomechanical modelling and simulation are introduced to accurately determine the combined effects of hydrocarbon production and changes in rock properties due to geomechanical effects. The reservoir geomechanical model is concerned with stress-related issues and rock failure in compression, shear, and tension induced by reservoir pore pressure changes due to reservoir depletion. In this paper, a rock mechanical model is constructed in geomechanical mode, and reservoir geomechanics simulations are run for a carbonate gas reservoir. The study begins with assessment of the data, construction of 1D rock mechanical models along the well trajectory, the generation of a 3D mechanical earth model, and runni</p> ... Show More

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(8)

Publication Date

Tue Jan 01 2019

Journal Name

Proceedings Of The 17th Laccei International Multi-conference For Engineering, Education, And Technology: “industry, Innovation, And Infrastructure For Sustainable Cities And Communities”

Type Curve Techniques for Hydraulically Fractured Wells in Tight Gas Reservoir

Omar

Danilo

Kenny

Luis

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Publication Date

Tue Sep 11 2018

Journal Name

Iraqi Journal Of Physics

Gas sensing performance of Sol-gel grown NiO-doped Cr2O3 nanoparticles

Sol-gel

gas sensor

NiO doped Cr2O3 nanoparticles.

Tunis B.

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The sensors based on Nickel oxide doped chromic oxide (NiO: Cr2O3) nanoparticals were fabricated using thick-film screen printing of sol-gel grown powders. The structural, morphological investigations were carried out using XRD, AFM, and FESEM. Furthermore, the gas responsivity were evaluated towards the NH3 and NO2 gas. The NiO0.10: Cr2O3 nanoparticles exhibited excellent response of 95 % at 100oC and better selectivity towards NH3 with low response and recovery time as compared to pure Cr2O3 and can stand as reliable sensor element for NH3 sensor related applications.

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(3)

Publication Date

Sun Dec 01 2024

Journal Name

Iraqi Journal Of Physics

Study of the Sensitivity of Carbon Quantum Dots for NO2 Gas Sensor and improve it using Graphene

Carbon Quantum Dot

Electrochemical Method

Electrochemical Process

Graphene

Gas Sensor.

Nuha Salem

Omar

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Gas sensors are essential for detecting noxious gases that have a detrimental effect on people's health and welfare. Carbon quantum dots (CQDs) are the fundamental component of gas detectors. CQDs and graphene (Gr) were prepared using the electrochemical method. The gas sensitivity of these materials was evaluated at different temperatures (150, 200, 250 °C) to assess their effectiveness. Subsequently, experiments were conducted at different temperatures to ascertain that the combination of CQDs and Gr, with various percentages of Gr and CQDs, exhibited superior gas sensitization properties compared to CQDs alone. This was evaluated based on criteria such as sensitivity, recovery time, and reaction time. Interestingly, the combination was

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