[1] Zhang Zhang, Ruoyan Yang, Ahmad Umar, Yanshan Gao, Junya Wang, Peng Lu, Zhanhu Guo, Liang Huang, Tuantuan Zhou, Qiang Wang, "Synthesis of ZnMoO4/Na2Mo4O13/?-MoO3 hybrid catalyst for the catalytic wet air oxidation of dye under room condition", Science of Advanced Materials, 6 (2014) 2159-2164. doi.org/10.1166/sam.2014.2127

[2] Sandeep Kumar, Gaurav Bhanjana, Neeraj Dilbaghi, Ahmad Umar, "Multi Walled Carbon Nanotubes as Sorbent for Removal of Crystal Violet", Journal of Nanoscience and Nanotechnology, 14 (2014) 7054-7059. [Special issue-invited article] doi.org/10.1166/jnn.2014.9236

[3] Ahmad Umar*, Rafiq Ahmad, Ali Al-Hajry, Sang Hoon Kim, Mohamed Eisa Abaker, and Yoon-Bong Hahn, "Spruce branched ?-Fe2O3 nanostructures as potential scaffold for highly-sensitive and selective glucose biosensor", New Journal of Chemistry, 38 (2014) 5873-5879. DOI: 10.1039/C4NJ01148A

[4] R. Kumar, G. N. Dar, S. Ansari, J. Wilson, Ahmad Umar*, D. S. Rana, P. Kumar, S. Chauhan, M. S. Chauhan, "ZnO Nanoparticles: Efficient material for the detection of hazardous chemical", Sensor Letters, 12 (2014) 1393-1398. doi.org/10.1166/sl.2014.3358

[5] Tianshan Xue, Yanshan Gao, Ahmad Umar*, Xingru Yan, Xi Zhang, Zhanhu Guo, Qiang Wang, "Adsorption of acid red from dye wastewater by Zn2Al-NO3 LDHs and the resource of adsorbent sludge as nanofiller for polypropylene", Journal of Alloys and Compounds, 587 (2014) 99-104. doi.org/10.1016/j.jallcom.2013.10.158

[6] Sang Hoon Kim, Ahmad Umar*, Y. B. Hahn, A. Al- Hajry, M. Abaker, "Low-temperature growth of aligned ZnO nanorods: Effect of annealing gases on the structural and optical properties", Journal of Nanoscience and Nanotechnology, 14 (2014) 4564-4569. doi.org/10.1166/jnn.2014.9029

[7] Pin Hao, Zhenhuan Zhao, Jian Tian, Haidong Li, Yuanhua Sang, Guangwei Yu, Huaqiang Cai, Hong Liu, C. P. Wong, Ahmad Umar*, "Hierarchical Porous Carbon Aerogel Derived from Bagasse for High Performance Supercapacitor Electrode", Nanoscale, 6 (2014) 12120-12129. DOI: 10.1039/C4NR03574G

[8] R. Kumar, D. Rana, Ahmad Umar*, P. Sharma, S. Chauhan, M. S. Chauhan, "Iron-doped ZnO nanoparticles as potential scaffold for hydrazine chemical sensor", Sensor Letters, 12 (2014) 1273-1278 doi.org/10.1166/sl.2014.3354

[9] Jingwen Wu, Qiang Wang*, Ahmad Umar*, Shihao Sun, Liang Huang, Junya Wang and Yanshan Gao, "Highly sensitive p-nitrophenol chemical sensor based on crystalline ?-MnO2 nanotubes", New Journal of Chemistry, 38 (2014) 4420-4426. doi.org/10.1016/j.snb.2014.05.112

[10] S.H. Al-Heniti, Ahmad Umar, H. M. Zaki, G. N. Dar, A. A. Al-Ghamdi and S. H. Kim, "Synthesis and characterizations of ferrite nanomaterials for Phenyl Hydrazine chemical sensor applications", Journal of Nanoscience and Nanotechnology, 14 (2014) 3765-3770. doi.org/10.1166/jnn.2014.8913

[11] Amit Kumar, Z. A. Ansari, H. Fouda, Ahmad Umar, S. G. Ansari, "Oxidative stress control in E. coli and S. aureus cells using amines adsorbed ZnO", Science of Advanced Materials, 6 (2014) 1236-1243. doi.org/10.1166/sam.2014.1882

[12] Kulvinder Singh, A. A. Ibrahim, Ahmad Umar*, Arun Kumar, G. R. Chaudhary, Sukhjinder Singh and S. K. Mehta, "Synthesis of CeO2-ZnO Nanoellipsoids as scaffold for the efficient detection of 4-nitrophenol", Sensors and Actuators B: Chemical, 202 (2014) 1044–1050 doi.org/10.1016/j.snb.2014.05.112

[13] C. Sumathi, P. Muthukumaran, S. Radhakrishnan, J. Wilson and Ahmad Umar*, "Controlled growth of single-crystalline nanostructured dendrites of ?-Fe2O3 blended with MWCNT: A Systematic investigation of highly selective determination of L-dopa", RSC Advances, 4 (2014) 23050-23057.  DOI: 10.1039/C4RA01451K

[14] Ahmad Umar*, Rafiq Ahmad, S. W. Hwang, S. H. Kim, M. S. Al-Assiri, Y. B. Hahn, "Development of Highly Sensitive and Selective Cholesterol Biosensor Based on Cholesterol Oxidase Co-Immobilized with ?-Fe2O3 Micro-Pine Shaped Hierarchical Structures", Electrochimica Acta, 135 (2014) 396-403. doi.org/10.1016/j.electacta.2014.04.173

[15] Siwen Zhang, Bosi Yin, Yang Jiao, Yang Liu, Fengyu Qu, Ahmad Umar*, Xiang Wu*, "Ultra-Long Germanium Oxide Nanowires: Structural and Optical Properties", Journal of Alloys and Compounds, 606 (2014) 149-153. doi.org/10.1016/j.jallcom.2014.03.171

[16] S. Al-Heniti, R. I. Badran, Ahmad Umar, H. M. Zaki, "Growth and properties of Sn-doped ZnO nanowires for heterojunction diode application", Science of Advanced Materials, 6 (2014) 1993-2000. DOI: 10.1039/C3NJ01619F

[17] Swati Sood, Surinder Kumar Mehta, Ahmad Umar* and Sushil Kumar Kansal*, "The visible light-driven photocatalytic degradation of Alizarin Red S using Bi-doped TiO2 nanoparticles", New Journal of Chemistry, 38 (2014) 3127- 3136.
DOI: 10.1039/C4NJ00179F

[18] Sushil Kumar Kansal*, Pranati Kundu, Swati Sood, Randeep Lamba, Ahmad Umar* and S. K. Mehta, "Photocatalytic degradation of the antibiotic levofloxacin using highly crystalline TiO2 nanoparticles", New Journal of Chemistry, 38 (2014) 3220-3226.DOI:  10.1039/C3NJ01619F

[19] Nuzhat Parveen, Ahmad Umar, Sonam Gupta, Sarika Singh and G.G.H.A. Shadab, "Amelioration of Iron Induced Clastogenicity and DNA Damage in Wistar rats by Thymoquinone", Science of Advanced Materials, 6 (2014) 933-945. doi.org/10.1166/sam.2014.1857

[20] Sheifali Shukla, Savita Chaudhary, Ahmad Umar*, Ganga Ram Chaudhary, S.K. Mehta, "Tungsten oxide (WO3) nanoparticles as scaffold for the fabrication of hydrazine chemical sensor", Sensors and Actuators B: Chemical, 196 (2014) 231-237 doi.org/10.1016/j.snb.2014.02.016

[21] Sang Hoon Kim, Ahmad Umar*, M. S. Akhtar, G. N. Dar, A. Al-Hajry, "ZnO balls made of intermingled nanocrystalline nanosheets for photovoltaic device application", Science of Advanced Materials, 6 (2014) 562-568. doi.org/10.1166/sam.2014.1795

[22] Zhang Zhang, Junya Wang, Liang Huang, Yanshan Gao, Ahmad Umar, Zhanggen Huang, Qiang Wang, "The influence of synthesis method on the CO2 adsorption capacity of Mg3Al-CO3 hydrotalcite-derived adsorbents", Science of Advanced Materials, 6 (2014) 1154-1159. DOI: 10.1166/sam.2014.1876

[23] Md. Shahabuddin, Anjali Sharma, Jitendra Kumar, Monika Tomar, Ahmad Umar, Vinay Gupta*, "Metal clusters activated SnO2 thin film for low level detection of NH3 gas", Sensors and Actuators B: Chemical, 194 (2014) 410-418. doi.org/10.1016/j.snb.2013.12.097

[24] Yang Liu, Yang Jiao, Zhenglin Zhang, Siwen Zhang, Bosi Yin, Ahmad Umar*, Fengyu Qu, Xiang Wu, "Hierarchical SnO2 nanostructures made of intermingled ultrathin nanosheets for environmental remediation, smart gas sensor and super-capacitor applications", ACS Applied Materials and Interfaces, 6(3) (2014) 2174-2184. DOI: 10.1021/am405301v

[25] Zhongpeng Wang, Xiaotong Yan, Xinlin Bi, Liguo Wang, Zhaoliang Zhang*, Zheng Jiang, Tiancun Xiao, Ahmad Umar, Qiang Wang, "Lanthanum-promoted Copper-based hydrotalcites derived mesoporous mixed oxides for NOx adsorption, soot combustion and simultaneous NOx-soot removal", Materials Research Bulletin, 51 (2014) 119-127. DOI: 10.1016/j.materresbull.2013.12.003

 [26] Rafiq Ahmad, Nirmalya Tripathy, Sang Hoon Kim, Ahmad Umar, A. Al-Hajry, Yoon-Bong Hahn*, "High performance cholesterol sensor based on ZnO nanotubes grown on Si/Ag electrodes", Electrochemistry Communications, 38 (2014) 4-7. doi.org/10.1016/j.elecom.2013.10.028

[27] H. M. Zaki, S. Al-Heniti, Robert Haddon, Ahmad Umar, G. N. Dar, Y. Al-Hadeethi and A. M. Alsanoosi, "Fabrication and characterization of smart chemical sensor based on CoAl0.7/Fe1.3O4 ferrite nanoparticles", Sensor Letters, 12 (2014) 1534-1539.

[28] X. Meng, L. Duan, H. Qin, X. Xie, Ahmad Umar, H. Wang, Q. Wang, "A novel synthesis and characterization of ordered meso/macroporous alumina with hierarchical and adjustable pore size", Journal of Nanoscience and Nanotechnology, 14 (2014) 7340-7344. [Special issue-invited article] doi.org/10.1166/jnn.2010.2082

[29] Suzan A. Khayyat*, S. G. Ansari and Ahmad Umar*, "Glucose Sensor Based on Copper Oxide Nanostructures", Journal of Nanoscience and Nanotechnology, 14 (2014) 3569-3574. doi:10.1166/sl.2014.3368

[30] Suzan A. Khayyat,  Rosilda Selvin, L. Selva Roselin, Ahmad Umar, "Photocatalytic oxidation of phenolic pollutants and hydrophobic organic compounds in industrial wastewater using modified nonosize TS-1 thin film technology", Journal of Nanoscience and Nanotechnology, 14 (2014) 7345-7350. [Special issue-invited article] DOI: 10.1166/jnn.2014.9237

[31] Sandeep Kumar, Gaurav Bhanjana, Kavita Jangra, Neeraj Dilbaghi, Ahmad Umar*, "Utilization of Carbon Nanotubes for the Removal of Rhodamine B Dye from aqueous solutions", Journal of Nanoscience and Nanotechnology, 14 (2014) 4331-4336 [Special issue-invited article] DOI: 10.1166/jnn.2013.8077 ·

[32] Girish Kumar, Rajesh Kumar, Ahmad Umar*, "Photocatalytic Degradation of Direct Red-23 Dye with ZnO Nanoparticles", Journal of Nanoscience and Nanotechnology, 14 (2014) 7161-7160 [Special issue-invited article] DOI: 10.1166/jnn.2014.9229

[33] Ganga Ram Chaudhary, Priya Saharan, Ahmad Umar*, S.K. Mehta, Suman Mor, "?–Fe2O3 Nanospindles for Environmental Remediation: A Study on the Adsorption and Desorption Characteristics of Acridine Orange and Direct Red Dyes", Journal of Nanoscience and Nanotechnology, 14 (2014) 3545-3551. [Special issue-invited article] doi.org/10.1166/jnn.2014.8715

[34] Suman Verma, Gaurav Bhanjana, Neeraj Dilbaghi, Sandeep Kumar, Ahmad Umar*, "Urea Biosensor Based on Zinc Oxide/Multi-Walled Carbon Nanotubes/Chitosan Nanocomposite Thin Films", Sensors Letters, 12 (2014) 50-55. doi.org/10.1166/sl.2014.3241

[35] Jingwen Wu, Qiang Wang, Ahmad Umar*, Shihao Sun, Yanshan Gao, Junya Wang, Liang Huang, "Fabrication and characterization of non-enzymatic glucose sensor based on Co3O4 nanoparticles", Sensors Letters, 12 (2014) 69-74. doi.org/10.1166/sl.2014.3239

[36] Z. A. Ansari, Ashna Irfan, Ahmad Umar*, H. Fouad, A. Al-Hajry, S. G. Ansari, "Fabrication and Characterization of Cholesterol Biosensor Based on Nanoscale Sn-TiO2 Thin Films", Sensors Letters, 12 (2014) 44-49. DOI: 10.1166/sl.2014.3240

[37] S. W. Hwang, Ahmad Umar*, G. N. Dar, S. H. Kim, R. I. Badran, "Synthesis and Characterizations of Iron Oxide Nanoparticles for Phenyl Hydrazine Chemical Sensor Applications", Sensors Letters, 12 (2014) 97-101. doi.org/10.1166/sl.2014.3224

[38] Hong Liu, Jinghui Zeng, Yuanhua Sang, Weijia Zhou, and Ahmad Umar, "A Special Issue on Heterostructured Semiconductor Nanophotocatalyst: Design, Synthesis, and Applications", Energy and Environment Focus, 3 (2014) 317-319. [Special issue-Editorial] doi.org/10.1166/eef.2014.1130

[39] Mohd. Sayeed Akhtar and Ahmad Umar, "A Special Issue on Biosynthesis of Nanomaterials and Their Applications", Reviews in Advanced Sciences and Engineering, 3 (2014) 197-198. [Special issue-Editorial] doi.org/10.1166/rase.2014.1063

[40] Z. Zhong, W. Wang, Q. Wang, W. D. Zhang, Y. Wang, Ahmad Umar, "Editorial: A special issue on Nanocatalysis and their applications", Journal of Nanoscience and Nanotechnology, 14 (2014) 6789-6791. [Special issue-Editorial] doi.org/10.1166/jnn.2014.8919

[41] Rajesh Kumar, Girish Kumar, Ahmad Umar*, "Pulse Laser Deposited Nanostructured ZnO Thin Films: A Review", Journal of Nanoscience and Nanotechnology, 14 (2014) 1911-1930.  [Special issue-invited article] DOI: 10.1166/jnn.2014.9120

[42] R. Kumar, G. Kumar, O. Al-Dossary, Ahmad Umar*, "ZnO Nanostructured Thin Films: Depositions, Properties and Applications-A Review", Materials Express, 5 (2014) 3-23. [Invited article] DOI: 10.1166/mex.2015.1204

[43] Savita Chaudhary, Ahmad Umar*, and S.K. Mehta, "Surface functionalized Selenium nanoparticles for biomedical applications", Journal of Biomedical Nanotechnology, 10 (2014) 3004-3042. DOI: 10.1166/jbn.2014.1985 [Special issue-invited article]

[44] R. Kumar, G. Kumar, Ahmad Umar*, "Zinc oxide nanomaterials for photocatalytic degradation of Methyl Orange: A Review", Nanoscience and Nanotechnology Letters, 6 (2014) 631-650. DOI: 10.1166/nnl.2014.1879 [Special issue-invited article]

[45] Priya Saharan, Ganga Ram Chaudhary, S.K. Mehta, Ahmad Umar*, "Removal of water contaminants by Iron Oxide Nanomaterials", Journal of Nanoscience and Nanotechnology, (2014) 627-643. DOI: 10.1166/jnn.2014.9053 [Special issue-invited article]