DataVXACS Applied Nano MaterialsPaper
journal article·2021-12-24

Copper Oxide Nanorod/Reduced Graphene Oxide Composites for NH3 Sensing

Muthu Mariappan Sivalingam, Jimena A. Olmos-Asar, Elangovan Vinoth, Thangeeswari Tharmar, Mohd. Shkir, Zafar Said, Karthikeyan Balasubramanian

ACS Applied Nano Materials· Volume 4· Issue 12
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Source abstract

Abstract

The NH3 sensing performance of copper oxide (CuO) nanorods can be enhanced with reduced graphene oxide (rGO) composites (i.e., CuO:rGO) due to their favorable Fermi level alignments and improved carrier mobility. However, the conductivity and the active sites in CuO:rGO are highly determined by the preparation techniques. Hence, we attempt to unravel the role of different chemical routes (wet chemical synthesis and hydrothermal preparation techniques) on the NH3 sensor device performance of CuO:rGO. Morphological imaging reveals the formation of 1D structures in both preparation techniques, and the role of graphene oxide on the evolution of CuO nanorods is discussed. First-principles calculations probe the interactions between CuO:rGO and NH3, and the structure is optimized for the most stable configuration. The absorption binding energies of the CuO:rGO–NH3 systems are measured to be 1.36 eV, which is much higher than those of the metal–rGO composites. For 50 ppm of NH3, the sensor response is measured to be 3.87 and 6.29 for chemically and hydrothermally synthesized CuO:rGO, respectively. The enhanced response of hydrothermal CuO:rGO is due to the more active sites induced on the CuO nanorod surface by rGO and the favorable band bending at the rGO–CuO interface.
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Research context

NanomaterialsComposites

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · ZnO doping and properties · Electrochemical sensors and biosensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, National Institute of Technology, Tiruchirappalli, Tamilnadu 620015, India

Department of Physics, St. Peter’s Institute of Higher Education and Research (SPIHER), Avadi, Chennai, Tamilnadu 600054, India

Departamento de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA-5016, Argentina

Instituto de Investigaciones en Físico-Química de Córdoba (INFIQC) − CONICET, Córdoba X5000HUA, Argentina

Functional Materials and Energy Devices (FMED) Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kaattankulathur, Chennai, Tamilnadu 603203, India

Department of Physics, Vel Tech Multitech Dr. Rangarajan Dr. Sakunthala Engineering College, Chennai, Tamilnadu 600062, India

Advanced Functional Materials and Optoelectronic Laboratory (AFMOL), Department of Physics, College of Science, King Khalid University, Abha 61413, Saudi Arabia

Department of Sustainable and Renewable Energy Engineering, University of Sharjah, Sharjah 27272, United Arab Emirates

Center for Advanced Materials Research, University of Sharjah, Sharjah 27272, United Arab Emirates

Funding

King Khalid University

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