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您的检索式：作者名="Umar Ishaq"
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| 1 | Low-Dimensional Halide Perovskites and Their Advanced Optoelectronic Applications显示文摘Metal halide perovskites are crystalline materials originally developed out of scientific curiosity. They have shown great potential as active materials in optoelectronic applications. In the last 6 years, their certified photovoltaic efficiencies have reached 22.1%. Compared to bulk halide perovskites, low-dimensional ones exhibited novel physical properties. The photoluminescence quantum yields of perovskite quantum dots are close to 100%. The external quantum efficiencies and current efficiencies of perovskite quantum dot light-emitting diodes have reached 8% and 43 cd A^(-1),respectively, and their nanowire lasers show ultralow-threshold room-temperature lasing with emission tunability and ease of synthesis. Perovskite nanowire photodetectors reached a responsivity of 10 A W^(-1)and a specific normalized detectivity of the order of 10^(12 )Jones. Different from most reported reviews focusing on photovoltaic applications, we summarize the rapid progress in the study of low-dimensional perovskite materials, as well as their promising applications in optoelectronic devices. In particular, we review the wide tunability of fabrication methods and the state-of-the-art research outputs of low-dimensional perovskite optoelectronic devices. Finally, the anticipated challenges and potential for this exciting research are proposed. | Jian Zhang Xiaokun Yang Hui Deng Keke Qiao Umar Farooq Muhammad Ishaq Fei Yi Huan Liu Jiang Tang Haisheng Song | 2017 | Nano-Micro Letters2017，9，3： | 10 |
| 2 | Chemical Composition of Gossypium herbaceum linn and its Antioxidant, Antibacterial, Cytotoxic and Antimalarial Activities显示文摘Background:Gossypium herbaceum(G.herbaceum),a plant commonly found in the wild in Nigeria,is said to possess some therapeutic activities.However,there is a dearth of information on its chemical constituents.Also,there is a need to investigate its therapeutic activities.Objective:To investigate the qualitative and quantitative phytochemical components of the leaf extracts of G.herbaceum,as well as its antioxidant,antimalarial and cytotoxic activity.Methods:Gas chromatography-mass spectrometry(GC-MS)analysis was used to determine the components of ethanol and hexane extracts of G.herbaceum leaf while 2,2-diphenyl-1-picrylhydrazyl(DPPH)and nitric oxide assays were used to determine the antioxidant potential.Malaria parasites viability was examined using parasite lactate dehydrogenase(pLDH)technique and HeLa cell was used for the cytotoxicity evaluation.Results:Bioactive compounds identified in ethanol and hexane extracts of G.herbaceum were 37 and 30 kinds,respectively,with major components as linoleic acid(36.10%and 33.82%),vitamin E(7.15%and 5.98%)and caryophyllene(4.21%and 5.08%).It also has tannins,saponins,alkaloids,flavonoids steroids,phenols and ter-penoids.In antibacterial test,significant inhibitory potentials against multidrug-resistant bacteria strains were present.In vitro antioxidant potentials(IC 50)of ethanol and hexane extracts were 3.33 and 4.12μg/mL for DPPH assays,and 3.87 and 5.00μg/mL for nitric oxide assays,respectively.Antiplasmodial activities(IC 50)were 9.99 and 9.76μg/mL for ethanol and hexane extracts,respectively.Conclusion:G.herbaceum leaf may provide novel plant-derived therapeutic agents,effective in treating infectious diseases arising from multiple drug-resistant bacteria and a target in the management of oxidative stress. | Rotimi Abisoye Larayetan Gideon Ayeni Abdulrazaq Yahaya Abayomi Ajayi Sunday Omale Umar Ishaq Dauda Joseph Abiodun Chijioke Olisah Julius Aigbogun Swesme Enyioma-Alozie | 2021 | Clinical Complementary Medicine and Pharmacology2021，1，1： | 0 |
| 3 | Catalytic Reduction of Coomassie Brilliant Blue R-250 by Silver Nanomagnetic Clusters显示文摘The research work represents the synthesis of silver nanoparticles(AgNPs)coated on magnetic iron oxide nanoparticles by chemical reduction and co-precipitation method,respectively.AgNPs were coated on magnetic ironoxide nanoparticles to form Ag@Fe3O4.AgNPs were characterized by UV-Visible spectroscopy.The magnetic nanoparticles(MNPs)and magnetic nanoclusters(MNC)were characterized by Fourier transform infra red(FTIR)spectroscopy.Bulk density,moisture content and ash content were also determined.These MNCs were used for the reduction of 4-nitrophenol(4-NP)and coomassie Brilliant Blue R-250(CBBR-250).The parameters such as effect of time,catalyst dosage,concentration of sodium borohydride and concentration of 4-NP and dye were studied.It was found that the catalytic reduction of 4-NP and dye were in 20 minutes by MNCs.Kinetic analysis shows that the pseudo-first-order was found to be linear.It revealed that the use of these MNCs can be considered as a reliable method for the catalytic reduction studies. | Madiha Ishaq Umar Farooq Muhammad Salman Muhammad Makhshoof Athar | 2021 | 材料科学与工程(中英文B版)2021，11，1： | 0 |
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