naa a22 4500 510803784 CHVBK 20180411083407.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11664-013-2699-4 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2699-4 Chemiresistive Gas Sensing by Few-Layered Graphene [Elektronische Daten] [K. Nemade, S. Waghuley] A chemiresistive gas sensor based on few-layered graphene (FLG) has been fabricated and evaluated for carbon dioxide (CO2) and liquid petroleum gas (LPG) sensing. The electrochemical exfoliation method was used to synthesize FLG. The resulting sample of FLG was characterized by x-ray diffraction, Raman spectroscopy, atomic force microscopy, and transmission electron microscopy with selected-area diffraction. Ultraviolet-visible and fluorescence spectroscopy were employed to study the optical properties. Thermal behavior was analyzed through thermogravimetric-differential thermal analysis. The sensing response of the chemiresistor is defined as the ratio of resistance in gas to air at the stabilized resistance in air. The FLG chemiresistor exhibited good sensing response (3.83 for CO2, 0.92 for LPG), response time (11s for CO2, 5s for LPG), recovery time (14s for CO2, 18s for LPG), and resolution limit (3ppm for CO2, 4ppm for LPG), and excellent stability at room temperature. The gas sensing mechanism is discussed on the basis of marginal difference in Raman intensity and also by using defect chemistry through fluorescence measurements. TMS, 2013 Few-layered graphene nationallicence carbon dioxide nationallicence liquid petroleum gas nationallicence defects nationallicence Nemade K. Department of Physics, Sant Gadge Baba Amravati University, 444 602, Amravati, India aut Waghuley S. Department of Physics, Sant Gadge Baba Amravati University, 444 602, Amravati, India aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/10(2013-10-01), 2857-2866 0361-5235 42:10<2857 2013 42 11664 https://doi.org/10.1007/s11664-013-2699-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2699-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nemade K. Department of Physics, Sant Gadge Baba Amravati University, 444 602, Amravati, India aut NATIONALLICENCE 700 1- Waghuley S. Department of Physics, Sant Gadge Baba Amravati University, 444 602, Amravati, India aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/10(2013-10-01), 2857-2866 0361-5235 42:10<2857 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer