@article{scholars17101,
            year = {2022},
         journal = {Crystals},
       publisher = {MDPI},
             doi = {10.3390/cryst12020264},
          volume = {12},
            note = {cited By 17},
          number = {2},
           title = {Copper Oxide/Functionalized Graphene Hybrid Nanostructures for Room Temperature Gas Sensing Applications},
             url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124814584&doi=10.3390\%2fcryst12020264&partnerID=40&md5=0228db483fb33b614b164479b44cda84},
        abstract = {Oxide semiconductors are conventionally used as sensing materials in gas sensors, however, there are limitations on the detection of gases at room temperature (RT). In this work, a hybrid of copper oxide (CuO) with functionalized graphene (rGO) is proposed to achieve gas sensing at RT. The combination of a high surface area and the presence of many functional groups in the CuO/rGO hybrid material makes it highly sensitive for gas absorption and desorption. To prepare the hybrid material, a copper oxide suspension synthesized using a copper acetate precursor is added to a graphene oxide solution during its reduction using ascorbic acid. Material properties of the CuO/rGO hybrid and its drop-casted thin-films are investigated using Raman, FTIR, SEM, TEM, and four-point probe measurement systems. We found that the hybrid material was enriched with oxygen functional groups (OFGs) and defective sites, along with good electrical conductivity (Sheet resistance{\texttt{\char126}}1.5 k{\^I}{\copyright}/{\^a}?!). The fabricated QCM (quartz crystal microbalance) sensor with a thin layer of the CuO/rGO hybrid demonstrated a high sensing response which was twice the response of the rGO-based sensor for CO2 gas at RT. We believe that the CuO/rGO hybrid is highly suitable for existing and future gas sensors used for domestic and industrial safety. {\^A}{\copyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.},
            issn = {20734352},
          author = {Gupta, M. and Hawari, H. F. and Kumar, P. and Burhanudin, Z. A.}
}