Demonstration of bare Laser reduced Graphene Oxide sensors for Ammonia and Ethanol Rivadeneyra Torres, Almudena Gerardo, Denice Romero, Francisco J. Toral López, Víctor Moraila-Martínez, Carmen Lucía Morales Santos, Diego Pedro Rodríguez Santiago, Noel C2H5OH gas sensor Graphene NH3 gas sensor Reduced graphene oxide (rGO) This work was mainly supported by TED2021-129949A-I00 funded by MCIN/AEI/10.13039/501100011033. It was also partially funded by the Andalusian regional projects supported through the Junta de Andalucía - Consejería de Universidad, Investigación e Innovación and FEDER funds: ProyExcel_00268, B-RNM-680-UGR20, P20_00265, P20_00633, as well as by the Spanish Ministry of Sciences and Innovation through the National Project PID2020-117344RB-I00, the Ramón y Cajal fellow RYC2019-027457-I and the María Zambrano fellow C21.I4.P1. In this work, gas sensors using laser-reduced graphene oxide (LrGO) as sensitive layer have been fabricated and studied. The laser-synthetized material were structurally and electrically characterized by means of Scanning Electron Microscopy (SEM), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and the four-point contact method. The gas-sensing properties of the samples were studied by their exposition to 10 ppm to 100 ppm of ethanol and 25 ppm to 130 ppm of ammonia. The results show that the devices present an electrical response corresponding to a purely resistive behavior up to 100 kHz. It is also demonstrated that the resistivity of the sensing layer increases as the gas concentration increases; being of 0.0402 ± 0.001 [%/ppm] for the case of ammonia and 0.0140 ± 0.001 [%/ppm] for the case of ethanol. These results outperform existing sensors and establish a better balance in terms of simplicity, sensitivity, linearity and technology sustainability. In summary, this work especially shows the potential of LrGO for low-cost and low-energy gas sensors fabrication. 2024-01-10T11:14:34Z 2024-01-10T11:14:34Z 2023 info:eu-repo/semantics/article Published version: A. Rivadeneyra et al. "Demonstration of bare Laser-reduced Graphene Oxide sensors for Ammonia and Ethanol," in IEEE Sensors Journal. [doi: 10.1109/JSEN.2023.3298823] https://hdl.handle.net/10481/86682 10.1109/JSEN.2023.3298823 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE