Author, as appears in the article.: Scardamaglia, Mattia; Casanova-Chafer, Juan; Temperton, Robert; Annanouch, Fatima Ezahra; Mohammadpour, Amin; Malandra, Gabriel; Das, Arkaprava; Alagh, Aanchal; Arbouch, Imane; Montoisy, Loic; Cornil, David; Cornil, Jerome; Llobet, Eduard; Bittencourt, Carla
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Alagh, Aanchal / Annanouch, Fatima Ezahra / Casanova Chafer, Juan / Llobet Valero, Eduard
Keywords: Tungsten compounds Tungsten Surfacepotential Surface potential Range Pressure Photoelectron spectroscopy Oxide Operando spectroscopy Nitrogen dioxide Monolayer mos2 Molecules Gases Gas sensing Gas sensin Density functional theory Charge-transfer Behavior Band bending Ammonia 2
Abstract: Ambient pressure X-ray photoelectron spectroscopy (APXPS) is combined with simultaneous electrical measurements and supported by density functional theory calculations to investigate the sensing mechanism of tungsten disulfide (WS2)-based gas sensors in an operando dynamic experiment. This approach allows for the direct correlation between changes in the surface potential and the resistivity of the WS2 sensing active layer under realistic operating conditions. Focusing on the toxic gases NO2 and NH3, we concurrently demonstrate the distinct chemical interactions between oxidizing or reducing agents and the WS2 active layer and their effect on the sensor response. The experimental setup mimics standard electrical measurements on chemiresistors, exposing the sample to dry air and introducing the target gas analyte at different concentrations. This methodology applied to NH3 concentrations of 100, 230, and 760 and 14 ppm of NO2 establishes a benchmark for future APXPS studies on sensing devices, providing fast acquisition times and a 1:1 correlation between electrical response and spectroscopy data in operando conditions. Our findings contribute to a deeper understanding of the sensing mechanism in 2D transition metal dichalcogenides, paving the way for optimizing chemiresistor sensors for various industrial applications and wireless platforms with low energy consumption.
Thematic Areas: Process chemistry and technology Nanoscience & nanotechnology Instrumentation Fluid flow and transfer processes Engenharias iii Chemistry, multidisciplinary Chemistry, analytical Bioengineering
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: juan.casanova@urv.cat fatimaezahra.annanouch@urv.cat aanchal.alagh@estudiants.urv.cat aanchal.alagh@estudiants.urv.cat eduard.llobet@urv.cat
Author identifier: 0000-0003-1533-6482 0000-0003-2466-8219 0000-0003-2466-8219 0000-0001-6164-4342
Record's date: 2024-10-19
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://pubs.acs.org/doi/10.1021/acssensors.4c01033
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Acs Sensors. 9 (8): 4079-40880
APA: Scardamaglia, Mattia; Casanova-Chafer, Juan; Temperton, Robert; Annanouch, Fatima Ezahra; Mohammadpour, Amin; Malandra, Gabriel; Das, Arkaprava; Alagh (2024). Operando Investigation of WS2 Gas Sensors: Simultaneous Ambient Pressure X-ray Photoelectron Spectroscopy and Electrical Characterization in Unveiling Sensing Mechanisms during Toxic Gas Exposure. Acs Sensors, 9(8), 4079-40880. DOI: 10.1021/acssensors.4c01033
Article's DOI: 10.1021/acssensors.4c01033
Entity: Universitat Rovira i Virgili
Journal publication year: 2024
Publication Type: Journal Publications