G. D’Olimpio1, D. W. Boukhvalov2, V. Galstyan3, Jessica Occhiuzzi1, Michael Vorochta4, M. Amati5, Z. Milosz5, L. Gregoratti5, M. C. Istrate6, C-N. Kuo7, C. S. Lue7, C. Ghica6, E. Comini3, A. Politano1 1 Department of Physical and Chemical Sciences, University of L’Aquila, L’Aquila, Italy 2 College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University Nanjing, P. R. China 3 Sensor Lab, Department of Information Engineering, University of Brescia, Brescia, Italy 4 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic 5 Elettra - Sincrotrone Trieste SCpA, Trieste, Italy 6 National Institute of Materials Physics, Magurele, Romania 7 Department of Physics, National Cheng Kung University, Tainan, Taiwan e-mail: antonio.politano@univaq.it Acknowledgments We acknowledge Elettra Sincrotrone Trieste for providing access to its synchrotron radiation facilities and for financial support under the SUI internal project. Original paper G. D'Olimpio et al., J. Mater. Chem. A, 2024, 12, 10329-10340. DOI: 10.1039/D4TA01287A. Fig. 1 Figure 1. (a,b) Operando µ-XPS measurements of In-3d and S-2p core levels: (black) after air annealing at 350°C, (red) during exposure to NO2 gas (1 kL dose, 1L = 10-6 Torr·s-1) at 350°C, and (yellow) after exposure to NO2. (c) In-3d image of the InS nanosheets. (d) Response of InS towards 5 ppm of NO2 as a function of its operating temperature (RH in the test chamber: 40%). (e) Dynamic response of InS toward different concentrations of NO2 (0.2, 0.5, 1, 2, and 5 ppm) at 400 °C (RH, 40%). (f) Response of InS toward NO2 (5 ppm), H2 (200 ppm), CO (200 ppm), CO2 (800 ppm), acetone (10 ppm), ethanol (10 ppm), CH4 (100 ppm) at an operating temperature of 400 °C and RH of 40 %. The response values for NO2, H2, and CO2 were calculated as the relative variation in sample resistance (ΔR/R0). The response values for CO, acetone, ethanol, and CH4 were calculated as the relative variation in sample conductance (ΔG/G0). Surfaces and Interfaces Elettra Highlights 2024–2025 113
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