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© 2022 by the authors. Licensee MDPI This research was funded by the Spanish Ministry of Innovation and Technology and the Spanish Ministry of Economy through Project RTI2018-097195-B-100. This research received funding from the Comunidad de Madrid and Universidad Autónoma de Madrid under the V PRICIT program through the Project SI3/PJI/2021-00393., Chemiresistive sensors have gained increasing interest in recent years due to the necessity of low-cost, effective, high-performance gas sensors to detect volatile organic compounds (VOC) and other harmful pollutants. While most of the gas sensing technologies rely on the use of high operation temperatures, which increase usage cost and decrease efficiency due to high power consumption, a particular subset of gas sensors can operate at room temperature (RT). Current approaches are aimed at the development of high-sensitivity and multiple-selectivity room-temperature sensors, where substantial research efforts have been conducted. However, fewer studies presents the specific mechanism of action on why those particular materials can work at room temperature and how to both enhance and optimize their RT performance. Herein, we present strategies to achieve RT gas sensing for various materials, such as metals and metal oxides (MOs), as well as some of the most promising candidates, such as polymers and hybrid composites. Finally, the future promising outlook on this technology is discussed, Ministerio de Ciencia e Innovación (MICINN), Comunidad de Madrid / Universidad Autónoma de Madrid (UAM), Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

©2022 Springer We acknowledge Elettra Sincrotrone Trieste for providing access to its synchrotron radiation facilities. This work was supported by MINECO/FEDER/M-ERA.Net Cofound projects: RTI2018-097195-B-I00 and PCIN-2017-106. I.P. and S.N. gratefully acknowledge financial support from EUROFEL., Anatase TiO_2 nanoparticles doped either with Li or Ni have been synthesized via hydrolysis in variable concentrations. Microstructural analysis confirms the high crystallinity of the doped nanoparticles with sizes around 7 nm, while compositional analysis shows low doping below 2% at. Despite the low concentration of dopants, variations in the Raman and Photoluminescence signals were observed in the doped nanoparticles, mainly due to non-stoichiometry and oxygen deficiency promoted by Li or Ni doping. Doping effects associated with Li and Ni were observed by photoelectron spectroscopy and first principle calculations, which associate the appearance of states in the valence band region to oxygen deficiency and Li or Ni doping and lower n-type character induced by Ni doping. Finally, changes in the thermally induced anatase-to-rutile transition (ART) have been also observed in the doped samples, leading to a dopant-promoted faster ART which occurs at lower temperature boosted due to the dopant effect., Ministerio de Ciencia e Innovación (MICINN)/ FEDER, Ministerio de Economía y Competitividad (MINECO), Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement Spanish Ministry of Innovation, Science, and Technology and the Spanish Ministry of Economy (RTI2018-097195-B-I00)., TiO_(2) is currently one of the most employed material in photocatalysis and optoelectronic applications. By doping with different elements, tailored luminescent and optoelectronic properties can be obtained, which further enhances its applicability. The achievement of deeper knowledge and control on the recombination processes via light-metal doping engineering promises a wider use in optoelectronic applications. In this work, the luminescent properties of undoped and Li-doped anatase TiO_(2) nanoparticles obtained by hydrolysis process are studied, by means of photoluminescence (PL) measurements from 10 K to room-temperature. TiO_(2) presents a wide emission which covers the visible range, while Li-doping quenches the emission on the low visible region. By terms of time-resolved luminescence (TR-PL), lifetime of the recombination processes can be obtained, in which a decrease on lifetime values can be observed for the doped samples., Ministerio de Ciencia e Innovación (MICINN), Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

Wide band gap semiconductors based on inorganic materials such SnO, SnO2or TiO2 present excellent chemical properties which make them suitable for different energy-related application such as Li-ion batteries, gas sensing or solar cells. Their involvement in such applications could be improved with controlled fabrication methods as well as by controlled doping to modify their morphology, sizeor optoelectronic properties. Besides, organic materials have attracted growing interest due their outstanding unique properties as flexibility, malleability or low cost. PEDOT:PSS is an organic polymer which possesses not only p-type conductivity but also transparency to visible light, valuable properties for energy applications..., Los semiconductores de band gap ancho basados en materiales inorgánicos como el SnO, el SnO2 o el TiO2 presentan excelentes propiedades físicas y químicas que los hacen adecuados para diferentes aplicaciones relacionadas con la energía, como las baterías de ion de litio, la detección de gases o las células solares. Su empleo en estas aplicaciones podría verse mejorado con métodos de fabricación controlados así como mediante la introducción de dopantes de manera controlada para modificar su morfología, tamaño o propiedades optoelectrónicas. Además, los materiales orgánicos han suscitado un interés creciente debido a sus excepcionales propiedades, como la flexibilidad, la maleabilidad o el bajo coste. El PEDOT:PSS es un polímero orgánico que posee no sólo conductividad de tipo p, sino también transparencia a la luz visible, propiedades valiosas para las aplicaciones energéticas...

© 2021 by the authors. Licensee MDPI This research was funded by the Spanish Ministry of Innovation, Science, and Technology and the Spanish Ministry of Economy through Research Projects RTI2018-097195-B-I00. This research received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 957225, project BAT4EVER. thank for the financial support from the Spanish Ministry of Science, Innovation and Universities (MICIU) and The Spanish National Research Council (CSIC) under Grant no. PIE 2010-6OE-013., In this work, semiconductor tin oxide (II) (SnO) nanoparticles and plates were synthesized at room conditions via a hydrolysis procedure. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the high crystallinity of the as-synthesized romarchite SnO nanoparticles with dimensions ranging from 5 to 16 nm. The stability of the initial SnO and the controlled oxidation to SnO_2 was studied based on either thermal treatments or controlled laser irradiation using a UV and a red laser in a confocal microscope. Thermal treatments induced the oxidation from SnO to SnO2 without formation of intermediate SnO_x, as confirmed by thermodiffraction measurements, while by using UV or red laser irradiation the transition from SnO to SnO_2 was controlled, assisted by formation of intermediate Sn3O4, as confirmed by Raman spectroscopy. Photoluminescence and Raman spectroscopy as a function of the laser excitation source, the laser power density, and the irradiation duration were analyzed in order to gain insights in the formation of SnO_2 from SnO. Finally, a tailored spatial SnO/SnO_2 micropatterning was achieved by controlled laser irradiation with potential applicability in optoelectronics and sensing devices., Unión Europea. Horizonte 2020, Ministerio de Ciencia e Innovación (MICINN), Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

Wide band gap semiconductors based on inorganic materials such SnO, SnO2or TiO2 present excellent chemical properties which make them suitable for different energy-related application such as Li-ion batteries, gas sensing or solar cells. Their involvement in such applications could be improved with controlled fabrication methods as well as by controlled doping to modify their morphology, sizeor optoelectronic properties. Besides, organic materials have attracted growing interest due their outstanding unique properties as flexibility, malleability or low cost. PEDOT:PSS is an organic polymer which possesses not only p-type conductivity but also transparency to visible light, valuable properties for energy applications...

© 2020 by the authors. Licensee MDPI This research was funded by the Spanish Ministry of Innovation, Science, and Technology and the Spanish Ministry of Economy through Research Projects MAT-2015-65274-R/FEDER, RTI2018-097195-B-I00, and M-ERA.NET PCIN-2017-106. SZK and ESM have received financial support from the M-ERA.net project 272806 by the Research Council of Norway., In this work, layered hybrid composites formed by tin oxide (SnO) nanoparticles synthesized by hydrolysis and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) have been analyzed. Prior to the composite study, both SnO and PEDOT:PSS counterparts were characterized by diverse techniques, such as X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), photoluminescence (PL), atomic force microscopy (AFM), optical absorption and Hall effect measurements. Special attention was given to the study of the stability of the polymer under laser illumination, as well as the analysis of the SnO to SnO_2 oxidation assisted by laser irradiation, for which different laser sources and neutral filters were employed. Synergetic effects were observed in the hybrid composite, as the addition of SnO nanoparticles improves the stability and electrical conductivity of the polymer, while the polymeric matrix in which the nanoparticles are embedded hinders formation of SnO_2. Finally, the Si passivation behavior of the hybrid composites was studied., Ministerio de Economía y Competitividad (MINECO)/ FEDER, Ministerio de Ciencia e Innovación (MICINN)/M-ERA.Net, Ministerio de Ciencia, Innovacion y Universidades (MCIU), Research Council of Norway, Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

©2020 Elsevier B.V. All rights reserved This research was funded by the MINECO/FEDER/M-ERA.Net projects MAT-2015-65274-R/FEDER, RTI2018-097195-B-I00 and M-ERA.NET PCIN-2017-106. SZK, and ESM have received financial support from M-ERA.net project 272806 by the Research Council of Norway., In this work, hybrid composites formed by PEDOT:PSS (poly(3,4-ethylene dioxythiophene):-polystyrene sulfonate) and anatase TiO_2 nanoparticles synthesized by hydrolysis were spin-coated on Si substrates in order to evaluate their potential implementation in Si-hybrid solar cells, based on their passivation behaviour. X-ray diffraction (XRD), photoluminescence (PL), Raman spectroscopy, quasi-steady state photoconductance (QSS-PC) based on PL imaging, and Hall effect measurements were carried out for the structural, optical and electrical characterization. Enhanced carrier lifetime values of tau similar to 0.5 ms were obtained by adding a controlled amount of TiO_2 nanoparticles (0.5% wt.) to the PEDOT:PSS matrix., Ministerio de Economía y Competitividad (MINECO)/ FEDER, Ministerio de Ciencia e Innovación (MICINN)/M-ERA.Net, Ministerio de Ciencia, Innovacion y Universidades (MCIU), Consejo de Investigación de Noruega/M-ERA.Net, Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub