@article{66041,
  author       = {{Voth, Sven and Zhao, Zhenyu and Baier, Dominik and Glass, Alexandra and Elgabarty, Hossam and Sandberg, Oskar J. and Grundmeier, Guido and Tiemann, Michael and Smått, Jan-Henrik and Anttu, Nicklas and de los Arcos de Pedro, Maria Teresa and Weinberger, Christian}},
  issn         = {{2379-3694}},
  journal      = {{ACS Sensors}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Role of Irradiance in Light-Activated In                    <sub>2</sub>                    O                    <sub>3</sub>                    Gas Sensors: Why More Light Is Not Always Better}}},
  doi          = {{10.1021/acssensors.6c01100}},
  year         = {{2026}},
}

@article{66036,
  abstract     = {{Light-assisted metal oxide-based chemiresistive gas sensors are widely explored for operation at relatively low temperatures, yet the investigation of the role of irradiance, as opposed to wavelength, remains underrepresented. Here, we systematically quantify the irradiance-dependent behavior of ordered mesoporous In2O3 under visible light illumination. Photoconductivity measurements reveal two distinct irradiance regimes consistent with trap-limited transport at low power and recombination- or saturation-limited transport at high power. Gas sensing experiments towards CO and H2 show a pronounced non-monotonic response, reaching maximum responses of 0.74 for 135 ppm CO at 67 mW cm−2 and 0.64 for 90 ppm H2 at 11 mW cm−2, followed by strong suppression at higher irradiance. Illumination also accelerated the response kinetics. At 60 ppm, t90 decreases from 96 to 12 s for CO and 141 to 27 s for H2, corresponding to an 8- and 5-fold faster response time, respectively. Near-ambient pressure-XPS under controlled atmosphere and density functional theory calculations indicate defect-mediated excitation. Oxygen vacancy states and illumination-induced modification of surface oxygen species govern this behavior. The results establish irradiance as a critical mechanistic parameter that determines whether In2O3 operates in a surface-controlled or bulk photoconductive regime. These findings highlight the need to explicitly optimize and report irradiance in illuminated gas sensor studies, and not only the power consumption of the light source.}},
  author       = {{Voth, Sven and Zhao, Zhenyu and Baier, Dominik and Glass, Alexandra and Elgabarty, Hossam and Sandberg, Oskar J. and Grundmeier, Guido and Tiemann, Michael and Smått, Jan-Henrik and Anttu, Nicklas and de los Arcos, Teresa and Weinberger, Christian}},
  issn         = {{2379-3694}},
  journal      = {{ACS Sensors}},
  keywords     = {{resistive gas sensing, indium oxide, photoactivation, irradiance, photoconductivity, charge carrier dynamics, oxygen vacancies}},
  number       = {{7}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Role of Irradiance in Light-Activated In<sub>2</sub>O<sub>3</sub>Gas Sensors: Why More Light Is Not Always Better}}},
  doi          = {{10.1021/acssensors.6c01100}},
  volume       = {{11}},
  year         = {{2026}},
}

@article{61015,
  author       = {{Baier, Dominik and Kieke, Laureen and Voth, Sven and Kloß, Marvin and Huck, Marten and Steinrück, Hans-Georg and Tiemann, Michael}},
  issn         = {{2379-3694}},
  journal      = {{ACS Sensors}},
  number       = {{8}},
  pages        = {{5664--5673}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Selective H<sub>2</sub> Gas Sensing Using ZIF-71/In-SnO<sub>2</sub> Bilayer Sensors: A Size-Selective Molecular Sieving Approach}}},
  doi          = {{10.1021/acssensors.5c00770}},
  volume       = {{10}},
  year         = {{2025}},
}

@article{43457,
  abstract     = {{The production of hydrogen and the utilization of biomass for sustainable concepts of energy conversion and storage require gas sensors that discriminate between hydrogen (H2) and carbon monoxide (CO). Mesoporous copper–ceria (Cu–CeO2) materials with large specific surface areas and uniform porosity are prepared by nanocasting, and their textural properties are characterized by N2 physisorption, powder XRD, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation states of copper (Cu+, Cu2+) and cerium (Ce3+, Ce4+) are investigated by XPS. The materials are used as resistive gas sensors for H2 and CO. The sensors show a stronger response to CO than to H2 and low cross-sensitivity to humidity. Copper turns out to be a necessary component; copper-free ceria materials prepared by the same method show only poor sensing performance. By measuring both gases (CO and H2) simultaneously, it is shown that this behavior can be utilized for selective sensing of CO in the presence of H2.}},
  author       = {{Baier, Dominik and Priamushko, Tatiana and Weinberger, Christian and Kleitz, Freddy and Tiemann, Michael}},
  issn         = {{2379-3694}},
  journal      = {{ACS Sensors}},
  keywords     = {{Fluid Flow and Transfer Processes, Process Chemistry and Technology, Instrumentation, Bioengineering}},
  number       = {{4}},
  pages        = {{1616 -- 1623}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors}}},
  doi          = {{10.1021/acssensors.2c02739}},
  volume       = {{8}},
  year         = {{2023}},
}