[1] Swati Sood, Sandeep Kumar, Ahmad Umar*, Amandeep Kaur, Surinder Kumar Mehta, Sushil Kumar Kansal, "TiO2 quantum dots for the photocatalytic degradation of indigo carmine dye" Journal of Alloys and Compounds 650 (2015) 193-198. doi.org/10.1016/j.jallcom.2015.07.164

[2] Ahmad Umar*, A. Al-Hajry, Rafiq Ahmad, S. Ansari, M. S. Al-Assiri and Hamed Algarni, "Fabrication and characterization of a highly sensitive hydroquinone chemical sensor based on iron-doped ZnO nanorods," Dalton Transactions 44 (2015) 21081-21087, DOI: 10.1039/C5DT03364K

[3] Pankaj Sharma, Ahmad Umar*, Dilbag Singh Rana, Ramesh Kumar, Suvarcha Chauhan and Mohinder Singh Chauhan, "Growth and Characterization of ?-Fe2O3 Nanoparticles for Environmental Remediation and Chemical Sensor Applications" Sci. Adv. Mater. 7 (2015) 2747–2754. doi.org/10.1166/sam.2015.2709

[4] Randeep Lamba, Ahmad Umar*, Surinder Kumar Mehta, William A. Anderson, Sushil Kumar Kansal, "Visible-light-driven photocatalytic properties of self-assembled cauliflower-like AgCl/ZnO hierarchical nanostructures", Journal of Molecular Catalysis A: Chemical 408 (2015) 189-201. doi.org/10.1016/j.molcata.2015.07.016

[5] Daowei Ding, Xingru Yan, Xi Zhang, Qingliang He, Bin Qiu, Dawei Jiang, Huige Wei, Jiang Guo, Ahmad Umar, Luyin Sun, Qiang Wang, Mojammel A Khan, David P. Young, Xin Zhang, Brandon Weeks, Thomas C. Ho, Zhanhu Guo and Suying Wei, "Preparation and enhanced properties of Fe3O4 nanoparticles reinforced polyimide nanocomposites", Superlattices and Microstructures 85 (2015) 305-320; doi:10.1016/j.spmi.2015.03.008

[6] Kazim Gurkan Polat, Chen Zhou, Ahmad Umar and M. Saif Islam, "Optimized Ultrasharp Silicon Nanowire Geometries for Enhanced Field Ionization Properties" MRS Proceedings, 1785, mrss15-2137628 (2015) doi:10.1557/opl.2015.514

[7] Sheifali Shukla, Savita Chaudhary, Ahmad Umar*, Ganga Ram Chaudhary, S.K. Mehta, "Dodecyl Ethyl Dimethyl Ammonium Bromide capped WO3 nanoparticles: Efficient Scaffold for Chemical Sensing and Environmental Remediation" Dalton Transactions 44 (2015) 17251; DOI: 10.1039/C5DT02853A

[8] S. Al-Heniti, R.I. Badran, Ahmad Umar*, "Temperature-dependent electrical properties of Sn-doped ZnO nanowires", Sci. Adv. Mater. 7 (2015) 2684-2691. doi.org/10.1166/sam.2015.2708

[9] S. Wageh, Mai Maize, A. M. Donia, Ahmed A. Al-Ghamdi, Ahmad Umar, "Synthesis and Characterization of mercaptoacetic acid capped cadmium sulphide quantum dots", Journal of Nanoscience and Nanotechnology, 15 (2015) 9861-9867. doi.org/10.1166/jnn.2015.10346

[10] Chunxiao Lv, Xianfeng Yang, Ahmad Umar, Yanzhi Xia, Yi(Alec) Jia, Lu Shang, Tierui Zhang and Dongjiang Yang, "Architecture-Controlled Synthesis of MxOy (M=Ni, Fe, Cu) Microfibres from Seaweed Biomass for High-Performance Lithium Ion Battery Anodes" Journal of Materials Chemistry A, 3 (2015) 22708-22715; DOI: 10.1039/C5TA06393K

[11] Randeep Lamba, Ahmad Umar,* S.K.Mehta, Sushil Kumar Kansal, "ZnO doped SnO2 nanoparticles heterojunction photo-catalyst for environmental remediation" Journal of Alloys and Compounds 653 (2015) 327-333. /doi.org/10.1016/j.jallcom.2015.08.220

[12] Ahmad Umar*, M. S. Akhtar, Mohammaed Sultan Al-Assiri, A. Al-Hajry, Hamed Algarni, Vagner Romito de Mendonça, Y. Masuda, Sanghoon Kim, Q. I. Rahman, "Highly porous ZnO nanosheets assembled rosette like morphology for dye sensitized solar cells: Growth and optical properties", New Journal of Chemistry 39 (2015) 7961-7970; DOI: 10.1039/C5NJ00551E;

[13] Amandeep Kaur, Ahmad Umar*, Sushil Kumar Kansal, "Sunlight-Driven Photocatalytic Degradation of Non-steroidal anti-inflammatory drug Based on TiO2 Quantum Dots" Journal of Colloid and Interface Science 459 (2015) 257-263. doi.org/10.1016/j.jcis.2015.08.010

[14] Qianjiang Yan, Zhang Zhang, Yili Zhang, Ahmad Umar, Zhanhu Guo, O'Hare, Dermot, Qiang Wang, " Hierarchical Fe3O4 Core–Shell Layered Double Hydroxide Composites as Magnetic Adsorbents for Anionic Dye Removal from Wastewater" European Journal of Inorganic Chemistry 25 (2015) 4182-4191 doi: 10.1002/ejic.201500650 

[15] S. Al-Heniti, Ahmad Umar, and H. M. Zaki, "Synthesis and Characterization of Zinc Oxide Nanosheets for Dye-Sensitized Solar Cells" Journal of Nanoscience and Nanotechnology, 15 (2015) 9954-9959. doi.org/10.1166/jnn.2015.10693

[16] Muhammad Yasir Khan, Mohammad Vaseem, Rafiq Ahmad, Ahmad Umar,
Sang-Hoon Kim, A. Al-Hajry and Yoon-Bong Hahn, "Optical and Electrical Properties of Li-Doped CuO Quantum-Dots Films by Solution Process" Science of Advanced Materials  7 (2015) 2481-2485. doi.org/10.1166/sam.2015.2649   

[17] Sakina Aamir, Z. A. Ansari, H. Fouad, Ahmad Umar*, AbdulAziz A. Al Kheraif, S. G. Ansari, "Effect of inoculum size and surface charges on the cytotoxicity of ZnO nanoparticles for bacterial cells" Science of Advanced Materials  7 (2015) 2515-2522 doi.org/10.1166/sam.2015.2431

[18] D. Kaushal, D.S. Rana, V.K. Syal, S. Chauhan and Ahmad Umar, "Micellar Solubilization of Furosemide- Influence of Cetyltrimethylammonium bromide in Water-Methanol Mixture" Journal of Molecular Liquids 211 (2015) 761-766 DOI: 10.1016/j.molliq.2015.08.002

[19] Zhicheng Han, Xin Zheng, Fang Hu, Fengyu Qu, Ahmad Umar*, Xiang Wu, "Facile synthesis of hollow ZnS nanospheres for environmental remediation" Materials Letters 160 (2015) 271-274. doi.org/10.1016/j.matlet.2015.07.152

[20] Shiwei Wang, Zhuo Chen, Ahmad Umar, Yao Wang, Tong Tian, Ying Shang, Yuzun Fan, Qi Qi and Dongmei Xu, "Supramolecularly Modified Graphene for Ultrafast-Responsive and highly stable Humidity Sensor" Journal of Physical Chemistry C 119 (2015) 28640-28647. DOI: 10.1021/acs.jpcc.5b08771

[21] Xin Zheng, Yang Jiao, Fengyu Qu, Fang Chai, Ahmad Umar*, Xiang Wu, "Template-less growth of well-crystalline ?-Fe2O3 nanopeanuts with enhanced visible-light driven photocatalytic properties" Journal of Colloid and Interface Science 457 (2015) 345-352 doi.org/10.1016/j.jcis.2015.07.023

[22] S. Chauhan, Santosh Kumari, K. Kumar, Ahmad Umar,* C.N. Sundaresan, and R. Gupta, "Influence of Iso-perthiocyanic Acid and Temperature on the Aggregation Properties of Sodium dodecylsulphate in Dimethylsulphoxide" Journal of Molecular Liquids 21 (2015) 338-345. doi.org/10.1016/j.molliq.2015.07.017

[23] M. S. Akhtar, M. K. Swamy, Ahmad Umar, A. A. Al Sahli, "Biosynthesis and characterization of silver nanoparticles from methanol leaf extract of Cassia didymobotyra and assessment of their antioxidant and antibacterial activities" Journal of Nanoscience and Nanotechnology, 15 (2015) 9818-9823. DOI: 10.1166/jnn.2015.10966

[24] Sang Hoon Kim, Ahmad Umar*, R. I. Badran, H. Algarni, "Synthesis and Properties of Aligned ZnO Nanorods on Si substrate and their Applications for p-Si / n-ZnO Heterojunction Diode" J. Nanoelectron. Optoelectron. 10, 688–693 (2015). DOI: 10.1166/jno.2015.1721

[25] Xueyan Li, Ahmad Umar, Tong Tian, and Yao Wang, "Supramolecular Fabrication of Polyelectrolyte-modified Reduced Graphene Oxide for NO2 Sensing Applications" Ceramic International 41 (2015) 12130-12136. doi.org/10.1016/j.ceramint.2015.06.030

[26] Z. A. Ansari, Ahmad Umar, H. Fouad, S. G. Ansari, "Dye-sensitized solar cells fabricated using Cu-doped TiO2 nanopowder with anthocyanin as sensitizer", Journal of Nanoelectronics and Optoelectronics 10 (2015) 290-294. doi.org/10.1166/jno.2015.1749

[27] Amit Kumar, Md Zafaryab, Ahmad Umar,* M. M. A. Rizvi, H. Fouad, Z. A. Ansari, S. G. Ansari, "Relief of Oxidative stress using curcumin and glutathione functionalized ZnO nanoparticles in HEK-293 cell line" Journal of Biomedical Nanotechnology 11 (2015) 1913-1926. doi.org/10.1166/jbn.2015.2166

[28] Lei Qiu, Yanshan Gao, Xingru Yan, Jiang Guo, Ahmad Umar, Zhanhu Guo, Qiang Wang, "Morphology-dependent performance of Mg3Al-CO3 layered double hydroxide as nanofiller for polypropylene nanocomposites" RSC Advances 5 (2015) 51900-51911. DOI: 10.1039/C5RA07911J

[29] Zhuo Chen, Ahmad Umar, Yao Wang, Tong Tian, Ying Shang, Yuzun Fan, Qi Qi, Dongmei Xu, and Lei Jiang, "Supramolecular Fabrication of Multilevel Graphene-based Sensors with High NO2 Sensibility", Nanoscale 7 (2015) 10259-10266. DOI:10.1039/c5nr01770j

[30] Ahmad Umar*, Rajesh Kumar, Girish Kumar, H. Algarni, S. H. Kim, "Effect of annealing temperature on the properties and photocatalytic efficiencies of ZnO nanoparticles" Journal of Alloys and Compounds 648 (2015) 46-52. doi.org/10.1016/j.jallcom.2015.04.236

[31] R. Ahmad, N. Tripathy, Y. B. Hahn, A. A. Ibrahim, S. H. Kim and Ahmad Umar*, "A robust enzymeless glucose sensor based on CuO nanoseeds modified electrode", Dalton Transaction 44 (2015) 12488–12492. DOI: 10.1039/c5dt01664a

[32] Shiwei Wang, Zhuo Chen, Ahmad Umar, Yao Wang and Peng-gang Yin, "Electric-field induced layer by layer assembly technique with single component for construction of conjugated polymer films" RSC Adv. 5 (2015) 58499–58503; DOI:10.1039/C5RA08503A

[33] S. H. Kim, Ahmad Umar*, R. Kumar, Ahmed A. Ibrahim, G. Kumar, "Cocoon-shaped CuO nanostructures: Growth, properties, and photocatalytic properties", Materials Letters 156 (2015) 138-141. doi.org/10.1016/j.matlet.2015.05.014

[34] Ahmad Umar*, R. Kumar, M. S. Akhtar, G. Kumar, S. H. Kim, Yao Wang, "Growth and properties of well-crystalline cerium oxide (CeO2) nanoflakes for environmental and sensor applications", Journal of Colloid and Interface Science 454 (2015) 61-68. doi.org/10.1016/j.jcis.2015.04.055

[35] Sang Hoon Kim, Ahmad Umar*, R. Kumar, H. Algarni, G. Kumar, "Facile and rapid synthesis of ZnO nanoparticles for photovoltaic device application" J. Nanosci. Nanotechnol. 15, 6807-6812 (2015) doi.org/10.1166/jnn.2015.11597

[36] Gaurav Bhanjana, Neeraj Dilbaghi, Rajesh Kumar, Ahmad Umar* and Sandeep Kumar, "SnO2 Quantum Dots as Novel Platform for Electrochemical Sensing of Cadmium", Electrochimica Acta 169 (2015) 97-102 doi.org/10.1016/j.electacta.2015.04.045

[37] Dong-Joo Kim, Ahmad Umar, and Sang-Kwon Lee, Effect of surface passivation and annealing on electrical characteristics of graphene/n-type silicon Schottky diodes" Science of Advanced Materials 7 (2015) 1451-1457. doi.org/10.1166/sam.2015.2405

[38] Yang Jiao, Yang Liu, Fengyu Qu, Ahmad Umar*, Xiang Wu, "Visible-light-driven photocatalytic properties of simply synthesized ?-Iron(III)oxide nanourchins", Journal of Colloid and Interface Science 451 (2015) 93-100. /doi.org/10.1016/j.jcis.2015.03.055

[39] Osmando F. Lopes, Vagner R. de Mendonça, Ahmad Umar*, M. S. Chuahan, R. Kumar, S. Chauhan, Caue Ribeiro, "Zinc based hydroxide/oxide and Zinc Hydroxy Stannate nanostructures as potential scaffold for environmental remediation", New Journal of Chemistry 39 (2015) 4624-4630, DOI: 10.1039/C5NJ00324E

[40] S. H. Kim, Ahmad Umar*, S. W. Hwang, "Rose-like CuO nanostructures for highly sensitive glucose chemical sensor application", Ceramic International 41 (2015) 9468-9475. doi.org/10.1016/j.ceramint.2015.04.003

[41] Swati Sood, Ahmad Umar*, Surinder Kumar Mehta, Sushil Kumar Kansal, "Highly effective nanoparticles photocatalysts for visible-light driven photocatalytic degradation of toxic organic compounds", Journal of Colloid and Interface Science 450 (2015) 213-223; doi:10.1016/j.jcis.2015.03.018

[42] Mohammed Fayez Al Rez, Trisha Choudhury, J. Islam, H. Fouad, Ahmad Umar, A.A. Khan, S. G. Ansari, Z. A. Ansari, "Tailoring the optoelectronic properties of nano-metal oxides using anthocyanins and lanthanide" Journal of Nanoscience and Nanotechnology, 15 (2015) 9548-9553. DOI: 10.1166/jnn.2015.11594

[43] R. Kumar, Ahmad Umar*, G. Kumar, M. S. Akhtar, Yao Wang, S. H. Kim, "Ce-doped ZnO nanoparticles for efficient photocatalytic degradation of direct red-23 dye", Ceramic International 41 (2015) 7773-7782; doi:10.1016/j.ceramint.2015.02.110

[44] Ahmad Umar*, M.S. Akhtar, A. Al-Hajry, M.S. Al-Assiri, G.N. Dar, M. Saif Islam, "Enhanced photocatalytic degradation of harmful dye and phenyl hydrazine chemical sensing using ZnO nanourchins", Chemical Engineering Journal, 262 (2015) 588-596. doi.org/10.1016/j.cej.2014.09.111

[45] Randeep Lamba, Ahmad Umar*, S. K. Mehta, Sushil Kumar Kansal, "Well-crystalline porous ZnO-SnO2 nanosheets: An effective visible-light driven photocatalyst and highly sensitive smart sensor material", Talanta, 131 (2015) 490-498. doi.org/10.1016/j.talanta.2014.07.096

[46] Jianjiang Li, Dongjiang Yang, Xiaoyi Zhu, Lu Wang, Ahmad Umar* and Guojun Song, "Preparation and Electrochemical Characterization of Sn-doped TiO2 (B) Nanotube as an Anode Material for Lithium-ion Battery", Science of Advanced Materials, 7 (2015) 821-826. DOI: 10.1166/sam.2015.2053

[47] R. Kumar, Ahmad Umar*, D.S. Rana, P. Sharma, M.S. Chauhan and S. Chauhan, "Ag-doped ZnO nanoellipsoids: Potential scaffold for environmental and sensing applications", Talanta 137 (2015) 204-213. 10.1016/j.talanta.2015.01.039

[48] Ahmad Umar*, "Highly sensitive chemical sensor based on CuO rosette-like nanostructures", J. Nanosci. Nanotechnol. 15, 6704-6709 (2015). doi.org/10.1166/jnn.2015.10754

[49] Randeep Lamba, Ahmad Umar*, S.K. Mehta, Sushil Kumar Kansal, "Sb2O3-ZnO nanospindles: a potential material for photocatalytic and sensing applications" Ceramic International, 41 (2015) 5429-5438. doi.org/10.1016/j.ceramint.2014.12.109

[50] Qingbo Zhang, Dawei Jiang, Li Liu, Yudong Huang, Jun Long, Guangshun Wu, Zijian Wu, Ahmad Umar, Jiang Guo, Xi Zhang, and Zhanhu Guo, "Effects of Graphene Oxide Modified Sizing Agents on Interfacial Properties of Carbon Fibers/Epoxy Composites", J. Nanosci. Nanotechnol. 15 (2015) 9807-9811. doi.org/10.1166/jnn.2015.10625

[51] Siwen Zhang,   Bosi Yin,   He Jiang,   Fengyu Qu,  Ahmad Umar* and   Xiang Wu, "Hybrid ZnO/ZnS nanoforests as the electrode materials for high performance supercapacitor application", Dalton Transaction, 44 (2015) 2409-2415; 10.1039/C4DT03270E.

[52] Sandeep Kumar, Gaurav Bhanjana, Neeraj Dilbaghi, and Ahmad Umar*, "Zinc oxide nanocones as potential scaffold for the fabrication of ultra-high sensitive hydrazine chemical sensor", Ceramic International, 41 (2015) 3101-3108. doi.org/10.1016/j.ceramint.2014.10.154

[53] Randeep Lamba, Ahmad Umar*, Surinder Kumar Mehta, Sushil Kumar Kansal, "CeO2-ZnO hexagonal nanodisks: Efficient material for the degradation of Direct Blue 15 dye and its simulated dye bath effluent under solar light", Journal of Alloys and Compounds, 620 (2015) 67-73. doi.org/10.1016/j.jallcom.2014.09.101

[54] Peng Liang, Lin Zhang, Xiaoliang Zhao, Jianjiang Li, Long Liu, Rongsheng Cai, Dongjiang Yang, and Ahmad Umar*, "Synthesis of ZnFe2O4/TiO2Composite Nanofibers with Enhanced Photoelectrochemical Activity", Science of Advanced Materials, 7 (2015) 295-300. DOI: 10.1166/sam.2015.2242

[55] Swati Sood, Ahmad Umar*, Surinder Kumar Mehta, A. S. K. Sinha, Sushil Kumar Kansal "Efficient Photocatalytic degradation of Brilliant Green using Sr-doped TiO2 nanoparticles", Ceramic International 41 (2015) 3533-3540. doi.org/10.1016/j.ceramint.2014.11.010

[56] Swati Sood, Ahmad Umar*, S.K.Mehta, Sushil Kumar Kansal, "?-Bi2O3 Nanorods: An Efficient Sunlight Active Photocatalyst for Degradation of Rhodamine B and 2, 4, 6-tricholorophenol", Ceramic International 41 (2015) 3355-3364. doi.org/10.1016/j.ceramint.2014.10.038

[57] Sang Hoon Kim, Ahmad Umar*, A. Al-Hajry, G. N. Dar, M. Abaker, and S. W. Hwang, "Fabrication and Characterization of Field Effect Transistor Based on High-Aspect Ratio Sulfur-Doped ZnO Nanowires", Journal of Nanoscience and Nanotechnology, 15 (2015) 3956-3961. doi.org/10.1166/jnn.2015.9530

[58] Ruoyan Yang, Zhang Zhang, Ahmad Umar, Yanshan Gao, Junya Wang, Peng Lu, Zhanhu Guo, Liang Huang, Tuantuan Zhou, Qiang Wang, "Preparation of Ni and Fe doped molybdate-based catalyst from Ni-Fe layered double hydroxide for the catalytic wet air oxidation of dyes", Science of Advanced Materials, 7 (2015) 1435-1442. DOI: 10.1166/sam.2015.2129

[59] Rajesh Kumar; Girish Kumar; Ahmad Umar*, M.S. Akhtar, "Sonophotocatalytic Degradation of Methyl Orange using ZnO nano-aggregates", Journal of Alloys and Compounds, 629 (2015) 167-172 doi.org/10.1016/j.jallcom.2014.12.232

[60] Ahmad Umar*, "Growth of multipod ZnO architectures made by accumulation of hexagonal nanorods for Dye Sensitized solar cell (DSSC) application", J. Nanosci. Nanotechnol. 15, 6801-6806 (2015). /doi.org/10.1166/jnn.2015.16801

[61] Kulvinder Singh, Appanjeet Kaur, Ahmad Umar, G.R. Chaudhary, Sukhjinder Singh, S. K. Mehta, "A comparison on the performance of zinc oxide and hematite nanoparticles for highly selective and sensitive detection of para-nitrophenol", Journal of Applied Electrochemistry, 3, (2015) 253-261 DOI: 10.1007/s10800-014-0762-3

[62] Sang Woon Hwang, Ahmad Umar*, Sang Hoon Kim, "?-Fe2O3 nanoparticles as an anode material for Lithium ion battery", Journal of Nanoscience and Nanotechnology, 15 (2015) 5129-5134.

[63] Ahmad Umar*, R. I. Badran, A. Al-Hajry, S. Al-Heniti, "Fabrication and Characterization of n-ZnO Hexagonal Nanorods/p-Si Heterojunction Diode: Temperature-Dependant Electrical Characteristics", Journal of Nanoscience and Nanotechnology, 15 (2015) 4969-4975. DOI: 10.1166/jnn.2014.9829

[64] Shaowei Chen and Ahmad Umar, "A Special Issue on Functional Nanomaterials", Sci. Adv. Mater. 7, (2015) 1913–1915 [Special issue-Editorial] doi.org/10.1166/sam.2015.2648

[65] Ahmad Umar, Tifeng Jiao, Ling Zang, Zhengping Liu, Byoung-Suhk Kim, and Bingbing Li, "A Special Issue on New Trends in Functional Organic-Inorganic Hybrid Materials" Sci. Adv. Mater. 7, 1673-1676 (2015) [Special issue-Editorial] doi.org/10.1166/sam.2015.2473

[66] Sang-Kwon Lee, Jung-Hyuk Koh, Sang-Mo Koo, and Ahmad Umar, "A Special Section on Nanoelectronics and Noble Energy Materials" J. Nanoelectron. Optoelectron. 10, 352-354 (2015) [Special issue-Editorial] doi.org/10.1166/jno.2015.1775

[67] Yao Wang, Ahmad Umar, Qi Qi, and Xincun Dou, "A Special Issue on Functional Nanomaterials for Sensor Applications" Sensor Lett. 13, 823-825 (2015) [Special issue-Editorial] doi.org/10.1166/sl.2015.3534

[68] Sang-Kwon Lee, Jung-Hyuk Koh, Hyunsoo Kim, and Ahmad Umar, "A Special Section on High Efficiency Optoelectronics and Energy Generating Devices" J. Nanoelectron. Optoelectron. 10, 226-228 (2015) [Special issue-Editorial] doi.org/10.1166/jno.2015.1774

[69] Honggang Fu and Ahmad Umar, "A special Issue on Solar Energy Photochemistry and Photocatalysis", Energy and Environment Focus, 4 (2015) 71-73 [Special issue-Editorial] doi.org/10.1166/eef.2015.1155.

[70] Yuanhua Sang, Hong Liu, Ahmad Umar*, "Photocatalysis from UV/Vis. to near-infrared light: Towards full solar light spectrum activity", CHEMCATCHEM, 7 (2015) 559-573; doi: 10.1002/cctc.201402812 [Invited article]

[71] Peng Lu, Yanshan Gao, Ahmad Umar, Tuantuan Zhou, Junya Wang, Zhang Zhang, Liang Huang, Qiang Wang, "Recent advances in cellulose–based forward osmosis membrane", Science of Advanced Materials, 7 (2015) 2182-2192. [Special issue-invited article] DOI: 10.1166/sam.2015.2269

[72] Tuantuan Zhou, Qiang Wang, Ahmad Umar*, Fei Xu, Yanshan Gao, Jingwen Wu, Zhang Zhang, Ruoyan Yang, Junya Wang, Liang Huang, Peng Lu, Zhanhu Guo, "Electrochemical Sensors Based on Semiconductor Nanostructures Modified Electrodes", Science of Advanced Materials, 7 (2015) 2069-2083. [Special issue-invited article] DOI: 10.1166/sam.2015.2437

[73] Rajesh Kumar, O. Al-Dossary, Girish Kumar, Ahmad Umar*, "Zinc oxide nanostructures for NO2 gas sensor applications: A Review", Nano-Micro Letters, 7 (2015) 97-120; doi: 10.1007/s40820-014-0023-3 [Invited article]