[1] Yas Al-Hadeethi, Saleh Al-Heniti, and Ahmad Umar*, Highly Sensitive Hydroquinone Chemical Sensor Based on Cd0.5Mg0.4Ca0.1Fe2O4 Nanoparticles, Sci. Adv. Mater. 9 (2017) 2196–2201

[2] C. Hong, Q. Zhou, Z. Lu, Ahmad Umar*, R. Kumar, Z. Wei, X. Wu, L. Xu, and S. H. Kim, Ag-doped ZnO nanoellipsoids based highly sensitive gas sensor", Mater. Express 7 (2017) 380–388

[3] Ritika Abrol, Manjot Kaur, Ahmad Umar, Surinder Kumar Mehta, Surinder Singh, Sushil Kumar Kansal, "Visible light photocatalytic degradation of organic pollutants using Molybdenum disulfide (MoS2) microtubes", Nanoscience and Nanotechnology Letters 9, 1966-1974 (2017).

[4] Ahmad Umar*, Sang Hoon Kim, Rajesh Kumar, Mohammad S. Al-Assiri,

A. E. Al-Salami, Ahmed A. Ibrahim and Sotirios Baskoutas, "In-Doped ZnO Hexagonal Stepped Nanorods and Nanodisks as Potential Scaffold for Highly-Sensitive Phenyl Hydrazine Chemical Sensors", Materials 10 (2017) 1337; DOI: 10.3390/ma10111337

[5] Tuantuan Zhou, Wanlin Gao, Yanshan Gao, Qiang Wang, Ahmad Umar*, "Co3O4 nanoparticles/MWCNTs composites: a potential scaffold for hydrazine and glucose electrochemical detection" RSC Advances 7 (2017) 50087-50096; DOI: 10.1039/C7RA10892C

[6] M. S. Al-Assiri, H. Algarni, M. Reben, E. Yousef, H. H. Hegazy, Y. M. AbouDeif, Ahmad Umar, UV- Vis- NIR and luminescent characterization of PZCdO:Tm laser oxide glasses, Optical Materials, 73 (2017) 284-289; DOI: 10.1016/j.optmat.2017.08.030

[7] Mingxuan Sun, Yuanyuan Kong, Yalin Fang, Swati Sood, Yuan Yao, Jifeng Shi, Ahmad Umar*, "Hydrothermal formation of N/Ti3+codoped multiphasic (brookite-anatase-rutile) TiO2 heterojunctions with enhanced visible light driven photocatalytic performance" Dalton Transactions 46 (2017) 15727-15735; DOI: 10.1039/C7DT03268D

[8] Wenle Pei, Tingting Zhang, Yao Wang, Zhuo Chen, Ahmad Umar, Hao Li, Wei Guo, "Enhancement of Charge Transfer between Graphene and Donor-?-Acceptor Molecule for Ultrahigh Sensing Performance" Nanoscale 9 (2017) 16273-16280; DOI:10.1039/C7NR04209D

[9] Amandeep Kaur, Deepak Saluanke, Ahmad Umar*, Surinder Kumar Mehta, A.S.K. Sinha, Sushil Kumar Kansal, "Visible light driven photocatalytic degradation of fluoroquinolone levofloxacin drug using Ag2O/TiO2 quantum dots: A mechanistic study and degradation pathway" New Journal of Chemistry 41 (2017) 12079-12090.

[10] Mun-Ki Choi, Gil-Sung Kim, Jin-Tak Jeong, Jung-Taek Lim, Won-Yong Lee, Ahmad Umar*, and Sang-Kwon Lee, "Functionalized vertical GaN micro pillar arrays with high signal-to-background ratio for detection and analysis of proteins secreted from breast tumor cells" Scientific Reports 7 (2017) 14917. DOI: 10.1038/s41598-017-14884-x

[11] Sajid Ansari, Zeenat Khatoon, Nazish Parveen, H. Fouad, Atul Kulkarni, Ahmad Umar, Z. A. Ansari, S. G. Ansari, "Polyaniline-functionalized TiO2 nanoparticles as a suitable matrix for hydroquinone sensor" Science of Advanced Materials 9 (2017) 2032-2038

[12] Ahmed A. Ibrahim, Rafiq Ahmad, Ahmad Umar*, M. S. Al-Assiri, A. E. Al-Salami, Rajesh Kumar, S.G. Ansari, S. Baskoutas, "Two-dimensional ytterbium oxide nanodisks based biosensor for selective detection of urea" Biosensors and Bioelectronics 98 (2017) 254-260

[13] Ahmed A. Ibrahim , Preeti Tiwari, M.S.Al-Assiri, A. E. Al-Salami, Ahmad Umar, Rajesh Kumar, S. H. Kim, Z.A. Ansari, S. Baskoutas, "Highly-sensitive picric acid chemical sensor based on ZnO nanopeanuts" Materials 10(7) (2017) 795, doi:10.3390/ma10070795

[14] H. Algarni, Ahmad Umar*, S. H. Kim, M. S. Al-Assiri, A. E. Al-Salami, "Highly stable field emission properties from well-crystalline 6-Fold Symmetrical hierarchical ZnO nanostructures" Ceramic International 43 (2017) 11753-11758

[15] Zhuo Chen, Yao Wang, Ying Shang, Ahmad Umar, Peng Xie, Qi Qi and Guofu Zhou, "One-Step Fabrication of Pyranine Modified- Reduced Graphene Oxide with Ultrafast and Ultrahigh Humidity Response" Scientific Reports 7 (2017) 2713; DOI:10.1038/s41598-017-02983-8

[16] H. Algarni, R. I. Badran, M. Ajmal Khan, Fredj Hassen, S. H. Kim, Ahmad Umar*, "Fabrication and temperature-dependent electrical characterization of n-ZnO nanowires/p-Si substrate heterojunction diodes" Journal of Nanoelectronics and Optoelectronics 12 (2017) 1162-1166.

[17] Won-Yong Lee, Jay-Young Ahn, Ahmad Umar, and Sang-Kwon Lee, "Uncertainty analysis of in- and cross-plane thermal conductivities of p-Bi0.5Sb1.5Te3 thin films by changing heater widths in the four-point-probe 3-omega method" Journal of Nanoelectronics and Optoelectronics 12 (2017) 986-991.

[18] Hua-Yun Du, Yan-Li An, Ying-Hui Wei, Li-Feng Hou, Chun-Li Guo, Ahmad Umar*, and Zhanhu Guo, "Iron Plates Modified with ZrO2 Coatings by Surface Mechanical Attrition Alloy and Heat Treatment" Science of Advanced Materials 9 (2017) 1729-1734

[19] Jianchen Cai, Jinyun Jiang, Zhaozhong Zhou, Yun Ding, Yang Zhang, Fei Wang, Cui Han,Jiang Guo, Qian Shao, Huayun Du, Ahmad Umar*, and Zhanhu Guo, "Toughening Poly (lactic acid) by Melt Blending with Poly (ether-block-amide) Copolymer" Science of Advanced Materials 9 (2017)1683-1692; DOI: https://doi.org/10.1166/sam.2017.3121

[20] Ahmed A. Ibrahim, Ahmad Umar* and S. Baskoutas, "Ytterbium doped Zinc Oxide nanopencils for chemical sensor application" Journal of Nanoscience and Nanotechnology 17 (2017) 9157-9162

[21] S. H. Kim, R. I. Badran and Ahmad Umar*, "Fabrication of ZnO nanorods based p-n heterojunction diodes and their electrical behavior with temperature" Journal of Nanoelectronics and Optoelectronics 12 (2017) 731-735.

[22] R. Lamba, Ahmad Umar*, S.K. Mehta, S. K. Kansal, "Ag2O decorated ZnO nanorods heterostructures for enhanced visible light driven photocatalytic applications" Seperation and Purification Technology 183 (2017) 341-349, http://doi.org/10.1016/j.seppur.2017.03.070

[23] Haixiang Song, Meng Wang, Yanfei Wang, Yadong Zhang, Ahmad Umar*, and Zhanhu Guo, "Waterborne Polyurethane/Graphene Oxide Nanocomposites with Enhanced Properties" Science of Advanced Materials 9 (2017) 1895-1904

[24] Ahmad Umar*, A. A. Alshahrani, H. Algarni, Rajesh Kumar, "CuO nanosheets as potential scaffolds for gas sensing applications" Sensors and Actuators B: Chemical 250 (2017) 24-31, DOI: 10.1016/j.snb.2017.04.062

[25] Md. Shahabuddin, Ahmad Umar, Monika Tomar, Vinay Gupta, "Custom designed metal anchored SnO2 sensor for H2 detection" International Journal of Hydrogen Energy 42(7) (2017) 4597-4609; DOI: 10.1016/j.ijhydene.2016.12.054

[26] Xueyi Mei; Qinghua Yan; Ruoyan Yang; Junya Wang; Yuhan Cui; Yu Nie; Ahmad Umar; Qiang Wang, "Synthesis of Pt/K2CO3/MgAlOx–reduced graphene oxide hybrids as promising NOx storage–reduction catalysts with superior catalytic performance", Nature Scientific Reports, 7 (2017) 42862; doi: 10.1038/srep42862.

[27] Won-Yong Lee, No-Won Park, Jay-Young Ahn, Ahmad Umar, and Sang-Kwon Lee, "Anisotropic behavior of the temperature-dependent thermal conductivity in p-type bismuth antimony telluride (p-Bi0.5Sb1.5Te3) thin films" Journal of Nanoelectronics and Optoelectronics, 12 (2017) 11231128

[28] Zhuo Chen, Jinrong Wang, Ahmad Umar, Yao Wang, Hao Li, Guofu Zhou, "Three-Dimensional Crumpled Graphene-Based Nanosheets with Ultrahigh NO2 Gas Sensibility" ACS Applied Materials & Interfaces, 9(13) (2017) 11819-11827. DOI: 10.1021/acsami.7b01229

[29] S. Sharma, Ahmad Umar*, S. K. Mehta, S. K. Kansal, "Fluorescent spongy carbon nanoglobules derived from pineapple juice as potential sensing probe for specific and selective detection of chromium (VI) ions" Ceramic International 43(9) (2017) 7011-7019. doi.org/10.1016/j.ceramint.2017.02.127

[30] Yas Al-Hadeethi, Ahmad Umar*, Ahmed A. Ibrahim, Saleh. H. Al-Heniti, Rajesh Kumar, S. Baskoutas, Bahaaudin M. Raffah, "Synthesis, characterization and acetone gas sensing applications of Ag-doped ZnO nanoneedles" Ceramic International 43 (2017) 6765-6770. doi.org/10.1016/j.ceramint.2017.02.088

[31] Sharanjit Kaur, Shelja Sharma, Ahmad Umar, * Surinder Singh, S. K. Mehta and Sushil Kumar Kansal, "Solar light driven enhanced photocatalytic degradation of brilliant green dye based on ZnS quantum dots" Superlattices and Microstructures 103 (2017) 365-375, DOI: 10.1016/j.spmi.2016.10.046

[32] Savita Chaudhary, Priyanka Sharma, Diksha Singh, and Ahmad Umar*, Rajeev Kumar, "Chemical and Pathogenic Cleanup of Wastewater Using Surface-Functionalized CeO2 Nanoparticles", ACS Sustainable Chemistry & Engineering 5 (8) (2017) 6803–6816, DOI: 10.1021/acssuschemeng.7b01041

[33] Qu Zhou, ChangXiang Hong, Yao Yao, Ahmed Mohamed Ibrahim, Lingna Xu, Rajesh Kumar, Sumaia Mohamed Talballa, S. H. Kim and Ahmad Umar *, "Fabrication and characterization of highly sensitive acetone chemical sensor based on ZnO nanoballs" Materials 10(7) (2017) 799, doi:10.3390/ma10070799

[34] A. S. Issa, Ahmad Umar, R. I. Badran, "Analytical solution of steady-state transport equation for photocarriers in CdTe photovoltaics under bias-dependent Photoluminescence" Journal of Nanoelectronics and Optoelectronics 12 (2017) 690-696

[35] Mingxuan Sun, Y. Fang, Y. Kong, X. Yuan, Ahmad Umar*, "Direct in situ synthesis of Fe2O3-codoped N-doped TiO2 nanoparticles with enhanced photocatalytic and photo-electrochemical properties" J. Alloys and Compounds 705 (2017) 89-97; DOI: http://dx.doi.org/10.1016/j.jallcom.2017.02.062

[36] Qingqing Qin, Junya Wang, Tuantuan Zhou, Qianwen Zheng, Liang Huang, Yu Zhang, Peng Lu, Ahmad Umar, Benoît Louis, Qiang Wang, "Impact of organic interlayer anions on the CO2 adsorption performance of Mg-Al layered double hydroxides derived mixed oxides" Journal of Energy Chemistry 26 (2017) 346-353

[37] No-Won Park, Jay-Young Ahn, Nam-Kyu Cho, Jin-Seong Park, Ahmad Umar, and Sang-Kwon Lee, "All in-plane thermoelectric properties of atomic layer deposition grown Al2O3/ZnO superlattice film in the temperature range from 300 to 500 K", Science of Advanced Materials (2017) 1296-1301

[38] S. A. Khayyat, Rosilda Selvin, Ahmad Umar, "Beckmann rearrangement of cyclohexanone oxime using nanocrystalline Titanium Silicalite-1 (TS-1)", Journal of Nanoscience and Nanotechnology 17 (2017) 2170-2176

[39] Naushad Khan, Taimur Athar, H. Fouad, Ahmad Umar, Z. A. Ansari, S. G. Ansari, Application of pristine and doped SnO2 nanoparticles as a matrix for agro-hazardous material (organophosphate) detection, Nature Scientific Reports, 7 (2017) 42510, DOI: 10.1038/srep42510

[40] H. Algarni, Ahmad Umar*, Sang Hoon Kim, M. S. Al-Assiri, S. AlFaify, "Growth of Quasi-Aligned ZnO Nanoneedles: Structural, Optical and Field Emission Properties" Journal of Nanoscience and Nanotechnology, 17 (2017) 2134-2139. doi.org/10.1166/jnn.2017.12803

[41] Jinghui Li, Zhuo Chen, Ahmad Umar, Yang Liu, Ying Shang, Xiaokai Zhang, Yao Wang, "Probe Into the Influence of Crosslinking on CO2 Permeation of Membranes" Scientific Reports 7 (2017) 40082; doi: 10.1038/srep40082

[42] Savita Chaudhary, Sandeep Kumar, Ahmad Umar*, Jasmeet Singh, Mohit Rawat, S.K. Mehta, "Europium-doped gadolinium oxide nanoparticles: A potential photoluminescencent probe for highly selective and sensitive detection of Fe3+ and Cr3+ ions" Sensors and Actuators B 243 (2017) 579–588. doi.org/10.1016/j.snb.2016.12.002

[43] Ahmad Umar*, Jong-Heun Lee, Rajesh Kumar, O. Al-Dossary, "Synthesis and Characterization of CuO Nanodisks for High-Sensitive and Selective Ethanol Gas Sensor Applications" Journal of Nanoscience and Nanotechnology, 17 (2017) 1455-1459. doi.org/10.1166/jnn.2017.12727

[44] Khushboo, Ahmad Umar*, Sushil K. Kansal and Surinder K Mehta, "Rapidly synthesized polyethylene glycol coated cadmium sulphide (CdS) nanoparticles as potential scaffold for highly sensitive and selective lethal cyanide ion sensor", Sensors and Actuators B: Chemical 241 (2017) 276-284 doi.org/10.1016/j.snb.2016.10.064

[45] Mohamed Hashem, Mohammed Fayez Al Rez, H. Fouad, Tarek Elsarnagawy, Mohamed A. Elsharawy, Ahmad Umar, Mansour Assery, S. G. Ansari, "Influence of Titanium oxide nanoparticles on the physical and thermomechanical behavior of poly methyl methacrylate (PMMA): a denture base resin" Science of Advanced Materials, 9 (2017) 938-944. doi.org/10.1166/sam.2017.3087

[46] Yas Al-Hadeethi, Ahmad Umar*, Saleh. H. Al-Heniti, R. Kumar, S. H. Kim, Xixiang Zhang, Bahaaudin M. Raffah, "2D Sn-doped ZnO ultrathin nanosheet networks for enhanced acetone gas sensing application" Ceramic International 43 (2017) 2418-2423; DOI: 10.1016/j.ceramint.2016.11.031

[47] R. I. Badran, Ahmad Umar*, "Fabrication of heterojunction diode based on n-ZnO nanowires/p-Si substrate: Temperature dependent transport characteristics" Journal of Nanoscience and Nanotechnology, 17 (2017) 581-587. doi.org/10.1166/jnn.2017.12436

[48] S. Chaudhary and Ahmad Umar*, "ZnO Nanostructures and Their Sensing Applications: A Review" Nanosci. Nanotech. Lett. 9, 1787-1826 (2017)

[49] S. Chaudhary, Ahmad Umar, * K.K. Bhasin and S. Singh, "Applications of Carbon Dots in Nanomedicine" Journal of Biomedical Nanotechnology, 13 (2017) 591-637

[50] Rajesh Kumar, Ahmad Umar*, Girish Kumar, and Hari Singh Nalwa, "Antimicrobial Properties of ZnO Nanomaterials: A Review" Ceramic International 43 (2017) 3940-3961 doi.org/10.1016/j.ceramint.2016.12.062

[51] Rajesh Kumar, Ahmad Umar*, Girish Kumar, Hari Singh Nalwa, Anil Kumar and M. S. Akhtar, "Zinc oxide nanostructure based dye sensitized solar cells" Journal of Materials Science 52 (2017) 4743-4795