Ahmad Umar

41.6k total citations · 7 hit papers
844 papers, 30.6k citations indexed

About

Ahmad Umar is a scholar working on Materials Chemistry, Electrical and Electronic Engineering and Renewable Energy, Sustainability and the Environment. According to data from OpenAlex, Ahmad Umar has authored 844 papers receiving a total of 30.6k indexed citations (citations by other indexed papers that have themselves been cited), including 405 papers in Materials Chemistry, 400 papers in Electrical and Electronic Engineering and 143 papers in Renewable Energy, Sustainability and the Environment. Recurrent topics in Ahmad Umar's work include Gas Sensing Nanomaterials and Sensors (201 papers), ZnO doping and properties (159 papers) and Advanced Photocatalysis Techniques (113 papers). Ahmad Umar is often cited by papers focused on Gas Sensing Nanomaterials and Sensors (201 papers), ZnO doping and properties (159 papers) and Advanced Photocatalysis Techniques (113 papers). Ahmad Umar collaborates with scholars based in Saudi Arabia, India and United States. Ahmad Umar's co-authors include Yoon‐Bong Hahn, Rajesh Kumar, S.K. Mehta, Sushil Kumar Kansal, Sotirios Baskoutas, Girish Kumar, Mohammed M. Rahman, Ahmed A. Ibrahim, Savita Chaudhary and A. Al‐Hajry and has published in prestigious journals such as SHILAP Revista de lepidopterología, Environmental Science & Technology and ACS Nano.

In The Last Decade

Ahmad Umar

823 papers receiving 30.0k citations

Hit Papers

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What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Zinc Oxide Nanostructures for NO2 Gas–Sensor Applications: A Review

2014 728 citations Rajesh Kumar, Ahmad Umar et al. profile →
Hierarchical porous carbon aerogel derived from bagasse for high performance supercapacitor electrode

2014 570 citations Ahmad Umar et al. profile →
Biomass-derived nitrogen-doped carbon quantum dots: highly selective fluorescent probe for detecting Fe3+ ions and tetracyclines

2018 537 citations Ahmad Umar et al. profile →
Hierarchical SnO₂ Nanostructures Made of Intermingled Ultrathin Nanosheets for Environmental Remediation, Smart Gas Sensor, and Supercapacitor Applications

2014 470 citations Ahmad Umar, Xiang Wu et al. profile →
Zinc oxide nanonail based chemical sensor for hydrazine detection

2007 466 citations Ahmad Umar et al. profile →
Antimicrobial properties of ZnO nanomaterials: A review

2016 462 citations Rajesh Kumar, Ahmad Umar et al. profile →
Nanomaterials-based biosensor and their applications: A review

2023 196 citations Ahmad Umar, Ahmed A. Ibrahim et al. profile →

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author						Papers	Cites
Ahmad Umar	16.1k	14.8k	7.0k	6.0k	4.6k	844	30.6k
Junhong Chen	11.5k 0.7×	16.0k 1.1×	7.8k 1.1×	5.0k 0.8×	5.7k 1.2×	322	25.3k
Ce Wang	8.1k 0.5×	9.9k 0.7×	5.3k 0.8×	6.0k 1.0×	3.9k 0.8×	514	23.4k
Jinhuai Liu	8.8k 0.6×	10.0k 0.7×	3.2k 0.5×	6.8k 1.1×	4.1k 0.9×	380	23.9k
Kakarla Raghava Reddy	10.4k 0.6×	7.7k 0.5×	7.7k 1.1×	4.7k 0.8×	3.3k 0.7×	231	23.3k
Li Wang	11.4k 0.7×	13.6k 0.9×	4.5k 0.6×	6.1k 1.0×	6.0k 1.3×	1.2k	31.7k
Shun Mao	8.8k 0.5×	10.6k 0.7×	6.5k 0.9×	4.1k 0.7×	3.6k 0.8×	236	19.1k
Xiao Huang	23.3k 1.4×	16.2k 1.1×	8.8k 1.3×	8.1k 1.3×	6.9k 1.5×	367	37.4k
Hua Bai	10.2k 0.6×	8.3k 0.6×	2.8k 0.4×	8.5k 1.4×	5.8k 1.3×	332	23.1k
Nam Hoon Kim	14.4k 0.9×	20.6k 1.4×	10.4k 1.5×	8.7k 1.4×	12.4k 2.7×	575	38.3k
Jingquan Liu	12.1k 0.8×	11.5k 0.8×	6.4k 0.9×	6.9k 1.1×	8.3k 1.8×	520	30.0k

Countries citing papers authored by Ahmad Umar

Since Specialization

Citations

This map shows the geographic impact of Ahmad Umar's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ahmad Umar with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ahmad Umar more than expected).

Fields of papers citing papers by Ahmad Umar

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ahmad Umar. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ahmad Umar. The network helps show where Ahmad Umar may publish in the future.

Co-authorship network of co-authors of Ahmad Umar

This figure shows the co-authorship network connecting the top 25 collaborators of Ahmad Umar. A scholar is included among the top collaborators of Ahmad Umar based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ahmad Umar. Ahmad Umar is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Chaudhary, Ganga Ram, et al.. (2025). Fluorescent Carbon Dots from Disposable Masks: Pathogen Sensing and UV-Blocking Film Integration. Journal of Fluorescence. 35(9). 8603–8618. 2 indexed citations

Umar, Ahmad, Ahmed A. Ibrahim, Sheikh A. Akbar, et al.. (2025). Next‐Generation Supercapacitors: Advances in Binder‐Free Electrodes, Scalable Fabrication, and Emerging Applications. Advanced Sustainable Systems. 10(1). 1 indexed citations

Chaudhary, Savita, et al.. (2025). Carbon dots in catalysis: Synthesis, properties, applications, comparative advantages, and future directions. Journal of environmental chemical engineering. 13(2). 115556–115556. 5 indexed citations

More, Pravin S., Sadaf Jamal Gilani, Yogesh B. Khollam, et al.. (2025). Polyvinyl Alcohol–Polyethylene Glycol Embedded Reduced Graphene Oxide Electronic Nose Sensor for Seafood Monitoring. Crystals. 15(5). 405–405. 1 indexed citations

Ramasamy, Selva Kumar, Manoj Kumar Singh, Ahmed A. Ibrahim, et al.. (2025). Synthesis, characterization, and antibacterial activity of novel pyrazole derivatives. Journal of Molecular Structure. 1332. 141706–141706. 2 indexed citations

Wang, Dengke, et al.. (2024). Highly active and durable NiCoP electrocatalyst through Ga ion intercalation strategy for long-lasting water electrolysis. Applied Surface Science. 660. 159972–159972. 21 indexed citations

Singh, Ranjeet, Rajesh K. Yadav, Satyam Singh, et al.. (2024). Nature-inspired polymer photocatalysts for green NADH regeneration and nitroarene transformation. Chemosphere. 353. 141491–141491. 2 indexed citations

Kumar, Ravi, Kuldeep Kumar, Naveen Thakur, et al.. (2024). Green synthesis and multifunctional properties of Cu/NiO nanocomposites using Commelina benghalensis leaf extract. Chemosphere. 362. 142805–142805. 7 indexed citations

Umar, Ahmad, Faheem Ahmed, Nabi Ullah, et al.. (2024). Exploring the potential of reduced graphene oxide/polyaniline (rGO@PANI) nanocomposites for high-performance supercapacitor application. Electrochimica Acta. 479. 143743–143743. 44 indexed citations

10.

Mkawi, E.M., Saif M. H. Qaid, Iman S. Roqan, et al.. (2024). Enhancement the performance of MAPbI3 perovskite solar cells via germanium sulfide doping. Optical Materials. 157. 116089–116089. 3 indexed citations

11.

Kumar, Raman, et al.. (2023). Recent advances and mechanisms of microbial bioremediation of nickel from wastewater. Environmental Science and Pollution Research. 31(28). 40224–40244. 7 indexed citations

12.

Abbas, Waseem, et al.. (2023). EVALUATION OF HYPERTENSION AWARENESS AMONG GENERAL POPULATION IN BAHAWALPUR, PAKISTAN: A CROSS SECTIONAL STUDY. SHILAP Revista de lepidopterología. 4(1). 2 indexed citations

13.

Zhao, Ming, Shilong Li, Ahmad Umar, & Xiang Wu. (2023). (NH4)2V10O25.8H2O nanowire materials for stable zinc ion storage. Materials Today Chemistry. 33. 101686–101686. 13 indexed citations

14.

Yadav, Rajesh K., Satyam Singh, Atul Pratap Singh, et al.. (2023). Highly Selective Nitrogen-Doped Graphene Quantum Dots/Eriochrome Cyanine Composite Photocatalyst for NADH Regeneration and Coupling of Benzylamine in Aerobic Condition under Solar Light. Catalysts. 13(1). 199–199. 10 indexed citations

15.

Ren, Zhe, Wenjuan Guo, Ahmad Umar, et al.. (2023). An electrochemical aptasensor based on stimulus response and signal amplification strategy for the detection of Amyloid-β oligomers. Microchemical Journal. 195. 109377–109377. 5 indexed citations

16.

Umar, Ahmad, Sheikh A. Akbar, Rajesh Kumar, et al.. (2023). Unveiling the potential of PANI@MnO2@rGO ternary nanocomposite in energy storage and gas sensing. Chemosphere. 349. 140657–140657. 24 indexed citations

17.

Kaur, Manjot, S.K. Mehta, Sushil Kumar Kansal, et al.. (2023). CeO2 quantum dots decorated g-C3N4 nanosheets: A potential scaffold for fluorescence sensing of heavy metals and visible-light driven photocatalyst. Journal of Alloys and Compounds. 960. 170637–170637. 23 indexed citations

18.

Luo, Yang, Rui Wu, Rui Fang, et al.. (2023). Superhydrophobic MOF based materials and their applications for oil-water separation. Journal of Cleaner Production. 420. 138347–138347. 54 indexed citations

19.

Wang, Dengke, Ahmad Umar, & Xiang Wu. (2023). Enhanced water electrolysis performance of bifunctional NiCoP electrocatalyst in alkaline media. Journal of Electroanalytical Chemistry. 950. 117888–117888. 14 indexed citations

20.

Hegazy, H.H., I.M. Ashraf, H. Algarni, & Ahmad Umar. (2019). An investigation on photoconductivity of non-stoichiometric CuZnSn(S, Se) ₄ thin films for photovoltaic applications. Physica Scripta. 94(8). 85807–85807. 3 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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