Browsing by Author "Ahmad, Zubair"
Now showing items 21-40 of 88
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Effect of microwave sintering on the crystal domain and electrical properties of TiO2 nanoparticles
Najeeb, Mansoor Ani; Alkareem, Asma; Awais, Muhammad; Ahmad, Zubair; Shakoor, R.A.; Alashraf, Abdulla; Mohamed, A. M. A.; Bhadra, Jolly; Al-Thani, N.J.; Touati, Farid; Rafique, Saqib... more authors ... less authors ( Springer Netherlands , 2017 , Article)We report the effect of microwaves sintering on the crystal domain and electrical properties of TiO2 nanoparticles. Commercially available TiO2 nanoparticles of 25 nm size were coated on ITO (indium tin oxide) substrates, ... -
Effective Pedagogical Approaches Used in High School Chemistry Education: A Systematic Review and Meta-Analysis
Ahmad, Zubair; Ammar, Mohammad; Sellami, Abdellatif; Al-Thani, Noora J. ( American Chemical Society , 2022 , Article)This article systematically reviews the pedagogical approaches adopted in high school chemistry education with the aim of highlighting the most effective evidence-based instructional practices reported in the literature. ... -
Electrical equivalent circuit (EEC) based impedance spectroscopy analysis of HTM free perovskite solar cells
Ahmad, Zubair; Mishra, Arti; Muhammad Abdulrahim, Sumayya ( Qatar University Press , 2020 , Poster)Monolithic perovskite solar cells (mPSCs) are the multi-layered organic-inorganic hybrid cells that have been focused due to the affordable cost, ease of fabrication and noteworthy power conversion efficiency (PCE). In ... -
Electrochemical impedance spectroscopy analysis of hole transporting material free mesoporous and planar perovskite solar cells
Abdulrahim, S.M.; Abdulrahim, Sumayya M.; Ahmad, Zubair; Bahadra, Jolly; Al-Thani, Noora J. ( MDPI , 2020 , Article Review)The future photovoltaic technologies based on perovskite materials are aimed to build low tech, truly economical, easily fabricated, broadly deployable, and trustworthy solar cells. Hole transport material (HTM) free ... -
Electrospun PVDF/ZnO Based Composite Fibers for Oil Absorption and Photocatalytic Degradation of Organic Dyes from Waste Water
Parangusan, Hemalatha; Bhadra, Jolly; Ahmad, Zubair; Al-Maadeed, Ali S.M.A.; Al-Mohannadi, Abdulaziz M.A.A.; Al-Thani, Noora... more authors ... less authors ( Springer , 2022 , Article)Clean drinking water has been a vital topic of research in modern world, this makes efficient water purification as the latest demand. The research and development in the field of filtration technology has revitalize ... -
Employment of single-diode model to elucidate the variations in photovoltaic parameters under different electrical and thermal conditions
Muhammad, Fahmi F.; Yahya, Mohd Y.; Hameed, Shilan S.; Aziz, Fakhra; Sulaiman, Khaulah; Rasheed, Mariwan A.; Ahmad, Zubair... more authors ... less authors ( Public Library of Science , 2017 , Article)In this research work, numerical simulations are performed to correlate the photovoltaic parameters with various internal and external factors influencing the performance of solar cells. Single-diode modeling approach is ... -
Enhancement of optical features and sensitivity of MEH-PPV/VOPcPhO photodetector using CdSe quantum dots
Malik, Haseeb Ashraf; Aziz, Fakhr; Asif, Muhammad; Mansoor, Ehsan Raza; Najeeb, Ani; Ahmad, Zubair; Swelm, Wageh; Zafar, Qayyum; Touati, Farid; Kamboh, Afzal Hussain; Supangat, Azzuliani; Sulaiman, Khaulah... more authors ... less authors ( Elsevier , 2016 , Article)In the present work, spectroscopic features and sensitivity of poly[2-methoxy-5-(2-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) and vanadyl 2, 9, 16, 23-tetraphenoxy-29H, 31H-phthalocyanine (VOPcPhO) based photodetector ... -
Exploring Teachers’ Perceptions of the Barriers to Teaching STEM in High Schools in Qatar
Sellami, Abdellatif; Ammar, Mohammad; Ahmad, Zubair ( MDPI , 2022 , Article)Understanding teachers’ attitudes and perceptions of STEM teaching is a key pathway to enhance effective STEM teaching. Inarguably, teachers are the cornerstone of educational quality and play a central role in students’ ... -
Fabrication and characterization of the organic rectifying junctions by electrolysis
Karimov, Khasan; Ahmad, Zubair; Ali, Rashid; Noor, Adnan; Akmal, M.; Najeeb, M. A.; Shakoor, R. A.... more authors ... less authors ( Springer Verlag , 2017 , Article)Unlike the conventional solution processable deposition techniques, in this study, we propose a novel and economical method for the fabrication of organic rectifying junctions. The solutions of the orange dye, copper ... -
Fabrication and Investigation of Graphite-Flake-Composite-Based Non-Invasive Flex Multi-Functional Force, Acceleration, and Thermal Sensor
Fatima, Noshin; Karimov, Khasan S.; Jamaludin, Farah Adilah; Ahmad, Zubair ( MDPI , 2023 , Article)This work examines the physics of a non-invasive multi-functional elastic thin-film graphite flake–isoprene sulfone composite sensor. The strain design and electrical characterization of the stretching force, acceleration, ... -
Fabrication of a nickel sulfide/nickel oxide heterostructure for efficient electrochemical oxidation of methanol
Sheikh, Faria; Arshad, Aleena; Marriam, Fareeha; Ahmad, Zubair; Haider, Ali; Iqbal, Mudassir; Mansoor, Muhammad Adil... more authors ... less authors ( Royal Society of Chemistry , 2023 , Article)As low-cost anode catalysts for the electrocatalytic oxidation of methanol, a nickel sulfide/nickel oxide (NiS/NiO) heterostructure deposited on Ni foam and its counterparts nickel sulfide (NiS) and nickel oxide (NiO) are ... -
Fabrication of flexible conductive films by rubbing in technology for application in elastic thermo-electric cells
Karimov, Khasan S.; Ahmad, Zubair; Bhadra, Jolly; Al-Thani, N. J. ( Elsevier B.V. , 2019 , Article)This method solves the problem of fabrication of flexible elastic conductive thin film samples for thermoelectric applications. For this purpose, rubbing in technology at room temperature condition has been used which is ... -
Fabrication of polyaniline-graphene/polystyrene nanocomposites for flexible gas sensors
Bhadra, Jolly; Popelk, Anton; Abdulkareem, Asma; Ahmad, Zubair; Touatib, Farid; Al-Thani, Noora... more authors ... less authors ( Royal Society of Chemistry , 2019 , Article)This research work presents the fabrication of polyaniline (PANI) and graphene-polyaniline (graphene-PANI) nanocomposite-coated polystyrene (PS) nanofibre mats, as well as their application in flexible and highly sensitive ... -
Facile and Novel LiAlO2 Film Electrodes for Energy Efficient Li recovery from Seawater Reverse Osmosis (SWRO) Brine
Hafsa, Umme; Zavahir, Sifani; ElMakki, Tasneem; Ahmad, Zubair; Han, Dong Suk ( Qatar University Press , 2021 , Poster)Concentration of Li in seawater is too low at 0.17 ppm despite its high content altogether with a reported 230 billion tons. Hence, seawater is not a practical source to recover Li from; Li is largely extracted by solar ... -
Flexible impedance and capacitive tensile load Sensor based on CNT composite
Ahmad, Zubair; Karimov, Kh S.; Touati, Farid ( Institute of Physics Publishing , 2016 , Article)In this paper, the fabrication and investigation of flexible impedance and capacitive tensile load sensors based on carbon nanotube (CNT) composite are reported. On thin rubber substrates, CNTs are deposited from suspension ... -
Flexible organic photo-thermogalvanic cell for low power applications
Ahmad, Zubair; Karimov, Khasan S.; Fatima, Noshin; Touati, Farid ( Springer New York LLC , 2016 , Article)In this paper, we report an organic semiconductor based flexible thermogalvanic cell for conversion of heat and light energy into electric power. This thermogalvanic cell has been fabricated using a eco-friendly, affordable ... -
Flexible thermo-electrochemical cells using Iodolyte HI-30 for conversion of low-grade heat to electrical energy
Ahmad, Zubair; Bhadra, Jolly; Touati, Farid; Alashraf, Abdullah; Shakoor, R. A.; Al-Thani, N. J.... more authors ... less authors ( Royal Society of Chemistry , 2016 , Article)In this research work, we investigated the flexible thermo-electro chemical cells (TECs) for the conversion of low-grade heat into electrical energy in the temperature range of 20–70 °C. The TECs were fabricated using 30 ... -
Fuzzy-based approach using iot devices for smart home to assist blind people for navigation
Tayyaba, Shahzadi; Ashraf, Muhammad Waseem; Alquthami, Thamer; Ahmad, Zubair; Manzoor, Saher ( MDPI , 2020 , Article)The demand of devices for safe mobility of blind people is increasing with advancement in wireless communication. Artificial intelligent devices with multiple input and output methods are used for reliable data estimation ... -
Gas sensor based on PANI/Cu-ZnS porous micropshere film for CO2 detection
Parangusan, Hemalatha; Bhadra, Jolly; Ahmad, Zubair; Mallick, Shoaib; Touati, Farid; Al-Thani, Noora Jabor... more authors ... less authors ( Qatar University Press , 2020 , Poster)In this letter, we report the structural, morphological and CO2 gas sensing properties of the polyaniline (PANI) coated Cu-ZnS microspheres. PANI coated Cu-ZnS microspheres were prepared by hydrothermal and in-situ ... -
Growth of MAPbBr3 perovskite crystals and its interfacial properties with Al and Ag contacts for perovskite solar cells
Najeeb, Mansoor Ani; Ahmad, Zubair; Shakoor, R.A.; Alashraf, Abdulla; Bhadra, Jolly; Al-Thani, N.J.; Al-Muhtaseb, Shaheen A.; Mohamed, A.M.A.... more authors ... less authors ( Elsevier B.V. , 2017 , Article)In this work, the MAPbBr3 perovskite crystals were grown and the interfacial properties of the poly-crystalline MAPbBr3 with Aluminum (Al) and Silver (Ag) contacts has been investigated. MAPbBr3 crystals are turned into ...