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\n@article{\n title = {Black Gold Layers: Preparation via Thermal Evaporation, Material and Optical Properties, Application Potential for Gas Sensors},\n type = {article},\n year = {2025},\n websites = {http://pubs.rsc.org/en/Content/ArticleLanding/2025/MA/D5MA00124B},\n month = {3},\n publisher = {RSC},\n id = {ef347e05-0c2c-3f05-945a-fe08a9eb933a},\n created = {2025-03-31T11:00:28.267Z},\n accessed = {2025-03-31},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2025-03-31T11:01:58.642Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Nanostructured black metal (BM) layers represent a valuable material for many technological uses. Their unique properties resulting from their structure are found to be used as electromagnetic absorbers, gas sensing devices, or electronics. While black gold films have been extensively studied in the past, there is still a gap in the use of evaporated BM films for sensor applications. This paper compares the material and optical properties of reflective and black gold films, both of which were prepared by the thermal evaporation technique in the residual argon. The impact of the nanostructured surface is discussed from the perspective of morphology, chemical composition, emissivity, reflectivity, and absorbance. Microscopic analyses revealed that the black gold is constituted of nanograins aggregating to a cauliflower-like structure. Positron annihilation spectroscopy reported a high concentration of pores in the black gold layer with a mean size of 1.1 nm. This highly porous structure allows high light absorbance in the visible wavelength range and strong electron plasma interactions in the infrared wavelength range. Preliminary results for gas sensing response to NO2, CH3CH2OH, NH3 and CO reveal the promising use of black gold coating for sensor applications.},\n bibtype = {article},\n author = {Kejzlar, Jan and More-Chevalier, Joris and Hruška, Martin and Otta, Jaroslav and Fitl, Premysl and Novotny, Michal and Poupon, Morgane and Hruška, Petr and Prokop, Dejan and Cichon, S. and Fekete, Ladislav and Goian, Veronica and Kamba, Stanislav and Cizek, Jakub and Butterling, Maik and Liedke, Maciej Oskar and Hirschmann, Eric and Wagner, Andreas and Vrňata, Martin and Lancok, Jan},\n doi = {10.1039/D5MA00124B},\n journal = {Materials Advances}\n}\n
@article{\n title = {Hydrogen sensing capabilities of highly nanoporous black gold films},\n type = {article},\n year = {2024},\n keywords = {Black Gold,Black Metals,Chemiresistors,Hydrogen Sensing,Nanomaterials,Positron Annihilation Spectroscopy},\n pages = {158618},\n volume = {647},\n websites = {https://linkinghub.elsevier.com/retrieve/pii/S0169433223022985},\n month = {2},\n id = {d9ceb4b3-f75a-3197-a1b4-8eec4cec1ca4},\n created = {2023-10-19T10:04:06.234Z},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2024-02-29T14:45:20.728Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n source_type = {JOUR},\n private_publication = {false},\n abstract = {Hydrogen sensing is a crucial topic for many industrial and environmental applications regarding the green deal and the use of hydrogen as a next-generation energy source/energy-storage medium. Therefore, many different approaches are being used to find sensitive, reliable, and inexpensive devices for hydrogen detection. One such approach is the use of chemiresistive nanostructured materials that provide a large surface area for hydrogen adsorption. In this paper, we present a detailed study of the hydrogen sensing capabilities of highly nanoporous black gold films that show fast response and recovery times (0.5 min) while operating at low temperatures (40 °C). To investigate the sensing properties of black gold, films with different levels of nanoporosity were prepared and tested to a hydrogen concentration in the range of 0.25–––0.95 %. Film morphology was characterised by AFM, SEM and XPS. To correctly examine the nanopores and defects in prepared films, variable energy positron annihilation spectroscopy (VEPAS) was used. We found that nanoporous black gold is suitable as an active chemiresistor layer for hydrogen sensing and that its sensitivity is the function of the film nanoporosity. Possible mechanisms of hydrogen-gold interactions are discussed.},\n bibtype = {article},\n author = {Hruška, Martin and Kejzlar, Jan and Otta, Jaroslav and Fitl, Přemysl and Novotný, Michal and Čížek, Jakub and Melikhova, Oksana and Mičušík, Matej and Machata, Peter and Vrňata, Martin},\n doi = {10.1016/j.apsusc.2023.158618},\n journal = {Applied Surface Science}\n}\n
@article{\n title = {Thermally stimulated exoelectron emission from the surface of black aluminum layers prepared by PVD methods},\n type = {article},\n year = {2024},\n pages = {112880},\n volume = {221},\n websites = {https://linkinghub.elsevier.com/retrieve/pii/S0042207X23010771},\n month = {3},\n publisher = {Pergamon},\n day = {13},\n id = {edbd0f10-98a8-3b9d-a9e3-b45dc4a3865c},\n created = {2023-12-13T12:57:30.216Z},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2024-02-05T11:50:59.221Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {There is an increasing trend in the utilization of highly nanostructured materials, especially as light absorbers or chemical gas sensors. However, for most applications a more detailed study of surface processes and phenomena is necessary or at least highly beneficial.\n\nThe present paper describes the surface processes of black aluminum prepared by different PVD methods (magnetron sputtering at room and liquid nitrogen temperature, and thermal evaporation) studied by thermally stimulated exoelectron emission. The actual investigation of the interaction between surface and adsorbed atoms and molecules was carried out after UV irradiation. For the samples prepared in this way, thermostimulated exoelectron emission was measured in the temperature range: liquid nitrogen temperature to 400 °C. SEM analysis revealed significant differences in the morphology of the layers, which were associated with a change in the position of the maxima in the thermostimulated exoelectron emission spectra.\n\nThe activation energies for the electron emission were calculated. The binding process on the surface of the individual samples and their dependence on the type of black aluminum thin film preparation were described.\n\nThe results could determine which type of thin film preparation is suitable for use as chemical gas sensors.},\n bibtype = {article},\n author = {Pokorný, P. and Hruška, M. and Novotný, M. and More-Chevalier, J. and .Fitl, P. and Chertopalov, S. and Kiba, T. and Kawamura, M. and Vrňata, M. and Lančok, J.},\n doi = {10.1016/j.vacuum.2023.112880},\n journal = {Vacuum}\n}\n
@article{\n title = {Preparation of black Ag films via a novel thermal evaporation process and comparisons of their properties at the constant thickness and the constant Ag amount},\n type = {article},\n year = {2024},\n keywords = {Characterization and Evaluation of Materials,Condensed Matter Physics,Machines,Manufacturing,Nanotechnology,Optical and Electronic Materials,Processes,Surfaces and Interfaces,Thin Films,Tools},\n pages = {1-10},\n volume = {130},\n websites = {https://link.springer.com/article/10.1007/s00339-024-07328-7},\n month = {2},\n publisher = {Springer},\n day = {7},\n id = {6ae0d941-6d3e-3e58-bc02-9f542194ae27},\n created = {2024-02-08T11:20:13.870Z},\n accessed = {2024-02-08},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2024-02-08T11:39:07.373Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Black Ag (B-Ag) films with nanoporous structures were prepared at various Ar gas pressures via thermal evaporation. The structure and properties of the films were compared systematically at a constant thickness of 1 μm or with a constant amount of Ag atoms of approximately 1.6 × 10-2 mol m–2. The conditions for high optical absorption were also determined. X-ray diffraction (XRD) revealed that the films were polycrystalline. When the films contained a constant amount of Ag atoms, the peak intensity was independent of the Ar gas pressure. Furthermore, their crystallite sizes were not significantly smaller than those of typical films deposited under high vacuum and did not decrease with an increase in the Ar gas pressure. Notably, these features are significantly different from those reported in a previous study. The size change of the nanoparticles observed using a Field Emission Scanning Electron Microscope was consistent with the tendency determined from XRD. The B-Ag films in the present study showed particle formation characteristics similar to those for metal particle formation in the gas phase. In summary, this is the first report of B-Ag films prepared primarily using nucleation in the gas phase rather than on the substrate.},\n bibtype = {article},\n author = {Takada, Kazuto and Kawamura, Midori and Kiba, Takayuki and Abe, Yoshio and Ueda, Mikito and Hruška, Martin and Novotný, Michal and Fitl, Premysl},\n doi = {10.1007/S00339-024-07328-7},\n journal = {Applied Physics A 2024 130:3},\n number = {3}\n}\n
@article{\n title = {Thermally stimulated desorption from the surface of black aluminum layers prepared by PVD methods.},\n type = {article},\n year = {2024},\n pages = {113425},\n websites = {https://linkinghub.elsevier.com/retrieve/pii/S0042207X24004718},\n month = {6},\n publisher = {Pergamon},\n day = {19},\n id = {aaa7a6fe-4248-3825-bf5e-3a579a6bb458},\n created = {2024-06-20T12:25:12.714Z},\n accessed = {2024-06-20},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2024-06-20T12:29:57.346Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {false},\n hidden = {false},\n private_publication = {false},\n abstract = {Black aluminum is characterized by a highly granular structure and porous surface - i.e. the real surface area is several times larger than its geometric projection to the substrate. In addition, it is a metal with good surface gas sorption capacity and structural stability up to temperatures T ∼ 500 °C.\n\nThe surface exchange interactions between the ambient environment and thin layers of black aluminum prepared by different methods are described. These properties are convenient for materials that are suitable for the fabrication of active layers of chemiresistors. The layers were prepared by magnetron sputtering at room temperature and liquid nitrogen temperature, and evaporation with different compositions and gas flow rates. In this work, the process of thermally stimulated desorption was measured using mass spectrometry. The calculation of the activation energy Eact for the release of individual desorbing atoms, or radicals, from the surface of black aluminum was performed. Knowing of the temperature and the number of particles released by desorption allows us to get an idea of the number of defects and the functionalized structure of the surface layer.},\n bibtype = {article},\n author = {Pokorný, P. and Novotný, M. and Hruška, M. and More-Chevalier, J. and Fitl, P. and Dekhtyar, Y. and Romanova, M. and Kiba, T. and Kawamura, M. and Vrňata, M. and Vacík, J. and Lančok, J.},\n doi = {10.1016/j.vacuum.2024.113425},\n journal = {Vacuum}\n}\n
@article{\n title = {Surface processes on thin layers of black aluminum in ultra-high vacuum},\n type = {article},\n year = {2022},\n pages = {111377},\n volume = {205},\n websites = {https://www.sciencedirect.com/science/article/pii/S0042207X22004997?via%3Dihub},\n month = {11},\n publisher = {Pergamon},\n id = {0ea4eb02-89a4-30dc-ac57-09b9080192b2},\n created = {2023-10-19T10:03:36.544Z},\n accessed = {2023-10-19},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2023-10-19T14:06:48.230Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {Thin films of black aluminum (B–Al) were prepared by pulsed DC magnetron sputtering in a mixture of argon + nitrogen (Ar + N2) gases with concentration of nitrogen 6%. At this concentration the process of anti-reflective surface (UV to near IR diffuse reflectance below 4%) formation is favored. The properties of such layers have been investigated using methods allowing to follow near-surface processes by means of thermally stimulated desorption (TSD) and thermally stimulated exo-electron emission (TSEE) in ultra-high vacuum conditions (p < 2.10−7 Pa). It is shown that at certain temperatures some adsorbed particles are desorbed and at the same time negative charges are emitted. In some cases, the emission sites are common. Comparison of TSEE measurements at three different excitations (α, proton irradiation and UV illumination) was performed. Common measurements together with calculations of the activation energies of desorption as well as electron emission sufficiently describe the centers responsible for these processes. In particular, the atomic oxygen Oat, the AlOH radical and partly the atomic nitrogen Nat together with the AlN radical are shown to play a significant role in this surface process.},\n bibtype = {article},\n author = {Pokorný, P. and Novotný, M. and More-Chevalier, J. and Dekhtyar, Y. and Romanova, M. and Davídková, M. and Chertopalov, S. and Fitl, P. and Hruška, M. and Kawamura, M. and Kiba, T. and Lančok, J.},\n doi = {10.1016/j.vacuum.2022.111377},\n journal = {Vacuum}\n}\n
@article{\n title = {Surface Enhancement Using Black Coatings for Sensor Applications},\n type = {article},\n year = {2022},\n pages = {4297},\n volume = {12},\n websites = {https://www.mdpi.com/2079-4991/12/23/4297},\n month = {12},\n publisher = {Multidisciplinary Digital Publishing Institute},\n id = {3e19fdc3-4b24-3fa8-9481-bab04791472d},\n created = {2023-10-19T10:03:47.509Z},\n accessed = {2023-10-19},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2023-10-19T14:06:18.351Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {The resolution of a quartz crystal microbalance (QCM) is particularly crucial for gas sensor applications where low concentrations are detected. This resolution can be improved by increasing the effective surface of QCM electrodes and, thereby, enhancing their sensitivity. For this purpose, various researchers have investigated the use of micro-structured materials with promising results. Herein, we propose the use of easy-to-manufacture metal blacks that are highly structured even on a nanoscale level and thus provide more bonding sites for gas analytes. Two different black metals with thicknesses of 280 nm, black aluminum (B-Al) and black gold (B-Au), were deposited onto the sensor surface to improve the sensitivity following the Sauerbrey equation. Both layers present a high surface roughness due to their cauliflower morphology structure. A high response (i.e., resonant frequency shift) of these QCM sensors coated with a black metal layer was obtained. Two gaseous analytes, H2O vapor and EtOH vapor, at different concentrations, are tested, and a distinct improvement of sensitivity is observed for the QCM sensors coated with a black metal layer compared to the blank ones, without strong side effects on resonance frequency stability or mechanical quality factor. An approximately 10 times higher sensitivity to EtOH gas is reported for the QCM coated with a black gold layer compared to the blank QCM sensor.},\n bibtype = {article},\n author = {Hruška, Martin and More-Chevalier, Joris and Fitl, Přemysl and Novotný, Michal and Hruška, Petr and Prokop, Dejan and Pokorný, Petr and Kejzlar, Jan and Gadenne, Virginie and Patrone, Lionel and Vrňata, Martin and Lančok, Jan},\n doi = {10.3390/NANO12234297},\n journal = {Nanomaterials MDPI},\n number = {23}\n}\n
@article{\n title = {Chemiresistors based on li-doped cuo–tio2 films},\n type = {article},\n year = {2021},\n pages = {246},\n volume = {9},\n websites = {https://www.mdpi.com/2227-9040/9/9/246},\n month = {9},\n publisher = {Multidisciplinary Digital Publishing Institute},\n id = {e9fe0232-7ff7-39fc-a1da-e5451d4db033},\n created = {2023-10-19T10:03:50.433Z},\n accessed = {2023-10-19},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2023-10-19T14:06:00.382Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {Chemiresistors based on thin films of the Li-doped CuO–TiO2 heterojunctions were synthesized by a 2-step method: (i) repeated ion beam sputtering of the building elements (on the Si substrates and multisensor platforms); and (ii) thermal annealing in flowing air. The structure and composition of the films were analyzed by several methods: Rutherford Backscattering (RBS), Neutron Depth Profiling (NDP), Secondary Ion Mass Spectrometry (SIMS), and Atomic Force Microscopy (AFM), and their sensitivity to gaseous analytes was evaluated using a specific lab-made device operating in a continuous gas flow mode. The obtained results showed that the Li doping significantly increased the sensitivity of the sensors to oxidizing gases, such as NO2, O3, and Cl2, but not to reducing H2. The sensing response of the CuO–TiO2–Li chemiresistors improved with increasing Li content. For the best sensors with about 15% Li atoms, the detection limits were as follows: NO2 → 0.5 ppm, O3 → 10 ppb, and Cl2 → 0.1 ppm. The Li-doped sensors showed excellent sensing performance at a lower operating temperature (200 °C); however, even though their response time was only a few minutes, their recovery was slow (up to a few hours) and incomplete.},\n bibtype = {article},\n author = {Torrisi, Alfio and Vacík, Jiří and Ceccio, Giovanni and Cannavò, Antonino and Lavrentiev, Vasily and Horák, Pavel and Yatskiv, Roman and Vaniš, Jan and Grym, Jan and Fišer, Ladislav and Hruška, Martin and Fitl, Přemysl and Otta, Jaroslav and Vrňata, Martin},\n doi = {10.3390/chemosensors9090246},\n journal = {Chemosensors},\n number = {9}\n}\n
@article{\n title = {Study of photoregeneration of zinc phthalocyanine chemiresistor after exposure to nitrogen dioxide},\n type = {article},\n year = {2021},\n pages = {237},\n volume = {9},\n websites = {https://www.mdpi.com/2227-9040/9/9/237},\n month = {8},\n publisher = {MDPI AG},\n id = {3a4b9a0f-a61d-3edc-abe5-ef1fc8ceb817},\n created = {2023-10-19T10:03:53.465Z},\n accessed = {2023-10-19},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2023-10-19T14:05:44.089Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {In this work, we present a complex study of photoregeneration of a zinc phthalocyanine (ZnPc) sensor by illumination from light-emitting diodes (LEDs). It includes an investigation of photoregeneration effectivity for various wavelengths (412–723 nm) of incident light carried out at sensor operating temperatures of 55 °C. It is demonstrated that the efficiency of photoregeneration is increasing with a decrease in the light wavelength. In the region of longer wavelengths (723–630 nm), the regeneration degree (RD) was low and ranged from 12% to 15%. In the region of shorter wavelengths (518–412 nm), the RD rose from 35% for 518 nm to 94% for 412 nm. The efficiency of photoregeneration is also shown to be higher in comparison with the temperature regeneration efficiency. In order to understand the chemism of photoregeneration processes, the electrical measurements are supplemented with Raman and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) studies. The spectroscopic results showed that nitrogen dioxide bonds to the Zn atom in ZnPc in the form of NO2− and NO−, i.e., partial decomposition of NO2 molecules occurs during the interaction with the surface. NAP-XPS spectra proved that light illumination of the ZnPc surface is essential for almost complete desorption of NOx species. At the same time, it is demonstrated that in case of long-time exposure or exposure of a ZnPc chemiresistor with a high concentration of NO2, the oxygen, released due to the NO2 decomposition, slowly but irreversibly oxidizes the layer. This oxidation process is most probably responsible for the sensor deactivation observed in sensor experiments with high NO2 concentrations. Based on these studies, the mechanism of nitrogen dioxide interaction with zinc phthalocyanine both under LED illumination and in dark conditions is proposed, and a special method for the sensor operation called “constant exposure dose” is established.},\n bibtype = {article},\n author = {Tomeček, David and Piliai, Lesia and Hruška, Martin and Fitl, Přemysl and Gadenne, Virginie and Vorokhta, Mykhailo and Matolínová, Iva and Vrňata, Martin},\n doi = {10.3390/chemosensors9090237},\n journal = {Chemosensors},\n number = {9}\n}\n
@article{\n title = {New insights towards high-temperature ethanol-sensing mechanism of zno-based chemiresistors},\n type = {article},\n year = {2020},\n pages = {1-14},\n volume = {20},\n websites = {https://www.mdpi.com/1424-8220/20/19/5602},\n month = {9},\n id = {203ead0d-0ae8-3a6f-8540-daed3dc8a55d},\n created = {2023-10-19T10:03:55.772Z},\n accessed = {2023-10-19},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2023-10-19T14:05:04.519Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n private_publication = {false},\n abstract = {In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 °C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O2/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analytes in the ambient air. To better understand the EtOH-sensing mechanism, the NAP-XPS spectra were also studied on exposure to O2/EtOH/H2O and O2/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that the reaction of EtOH with chemisorbed oxygen on the surface of ZnO NRs follows the acetaldehyde pathway. It was also demonstrated that, during the sensing process, the surface becomes contaminated by different products of MeCHO decomposition, which decreases dc-sensor performance. However, the ac performance does not seem to be affected by this phenomenon.},\n bibtype = {article},\n author = {Piliai, Lesia and Tomeček, David and Hruška, Martin and Khalakhan, Ivan and Nováková, Jaroslava and Fitl, Přemysl and Yatskiv, Roman and Grym, Jan and Vorokhta, Mykhailo and Matolínová, Iva and Vrňata, Martin},\n doi = {10.3390/s20195602},\n journal = {Sensors (Switzerland)},\n number = {19}\n}\n
@article{\n title = {Phthalocyanine Photoregeneration for Low Power Consumption Chemiresistors},\n type = {article},\n year = {2018},\n pages = {2558-2565},\n volume = {3},\n websites = {https://pubs.acs.org/doi/10.1021/acssensors.8b00922},\n month = {12},\n day = {28},\n id = {b6c29ff8-c537-32a6-b24a-2abbe2f3e2e9},\n created = {2023-10-19T10:03:58.365Z},\n file_attached = {false},\n profile_id = {d93fd8e4-0fb0-3e3d-a377-1ecd109e9ef5},\n group_id = {b5b4ee09-415c-31ca-8d64-00b0be9b2541},\n last_modified = {2023-10-19T14:04:50.563Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Tomecek2018a},\n private_publication = {false},\n abstract = {It is well-known that the applicability of phthalocyanine chemiresistors suffers from long recovery time after NO2 exposure. This circumstance enforces the necessity to operate the sensors at elevated temperatures (150–200 °C), which shortens the sensor lifetime and increases its power consumption (regardless, a typical measurement period is longer than 15 min). In this paper, we propose a new method for fast and effective recovery by UV–vis illumination at a low temperature (55 °C). The method is based on short illumination following short NO2 exposure. To support and optimize the method, we investigated the effects of light in the wavelength and intensity ranges of 375–850 nm and 0.2–0.8 mW/mm2, respectively, on the rate of NO2 desorption from the phthalocyanine sensitive layer during the recovery period. This investigation was carried out for a set of phthalocyanine materials (ZnPc, CuPc, H2Pc, PbPc, and FePc) operating at slightly elevated temperatures (55–100 °C) and was further supported by the analysis of UV–vis and FTIR spectral changes. We found out that the light with the wavelength shorter than 550 nm significantly accelerates the NO2 desorption from ZnPc, CuPc, and FePc, and allows bringing the measurement period under 2 min and decreasing the sensor power consumption by 75%. Possible mechanisms of the light-stimulated desorption are discussed.},\n bibtype = {article},\n author = {Tomecek, David and Hruska, Martin and Fitl, Premysl and Vlcek, Jan and Maresova, Eva and Havlova, Sarka and Patrone, Lionel and Vrnata, Martin},\n doi = {10.1021/acssensors.8b00922},\n journal = {ACS Sensors},\n number = {12}\n}\n