Sensors and Actuators Reports最新文献

{"title":"Chemometric-assisted eMIP-modified screen-printed sensor for robust herbicide MCPA determination","authors":"Camilla Zanoni ,&nbsp;Raffaela Biesuz ,&nbsp;Lisa Rita Magnaghi ,&nbsp;Giancarla Alberti","doi":"10.1016/j.snr.2024.100193","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100193","url":null,"abstract":"<div><p>The paper describes the development and application of a screen-printed electrode cell with a graphite-ink working electrode modified by a molecularly imprinted electropolymerized polypyrrole for the voltammetric determination of the herbicide 4‑chloro-2-methylphenoxyacetic acid (MCPA). The method exploits the direct measurement of the analyte by applying the differential pulse voltammetry (DPV) technique, taking advantage of the irreversible oxidation peak at about +1.0 V vs. Ag/AgCl pseudo reference electrode. The presence of the molecularly imprinted polypyrrole enhances the sensor's selectivity and sensitivity. A chemometric approach has been crucial for quantitative analysis because of the peak's broad and not well-defined shape. Firstly, a proper pretreatment of the voltammetric signals is identified, proving the most effective is the first-derivative function transformation of the signal. The Partial Least Square regression (PLS) is the tool applied for MCPA quantification. A preliminary PLS model has been developed and validated in dihydrogen phosphate solution at pH 5.5, aiming to optimize the data treatment approach. Then, the same approach is used to develop a PLS model analyzing tap water samples fortified with MCPA and other pesticides as possible interferents to simulate contaminated natural waters. The model correctly predicted the analyte concentration in the range of 2.5–75 μM, assuring the reliability and robustness of the sensor for the possible quantification of MCPA in wastewater samples.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100193"},"PeriodicalIF":5.9,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000092/pdfft?md5=35136a51a40adac0d1a82c65914aa0d6&pid=1-s2.0-S2666053924000092-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140344424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing room-temperature gas sensing performance of metal oxide semiconductor chemiresistors through 400 nm UV photoexcitation","authors":"Suporna Paul ,&nbsp;Emily Resendiz Mendoza ,&nbsp;Dung Thi Hanh To ,&nbsp;Thomas F. Stahovich ,&nbsp;Jennifer Schaefer ,&nbsp;Nosang V. Myung","doi":"10.1016/j.snr.2024.100194","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100194","url":null,"abstract":"<div><p>One of the most significant drawbacks of metal oxide (MOS) based chemiresistive gas sensors is the requirement of high operating temperature (250–450 °C), which results in significant power consumption and shorter lifetime. To develop room temperature (21±2 °C) MOS chemiresistive gas sensors, the sensing performance of different MOS nanostructures (i.e.<em>,</em> tin (IV) oxide (SnO₂) nanoparticles (NPs), indium (III) oxide (In₂O₃) NPs, zinc oxide (ZnO) NPs, tungsten trioxide (WO₃) NPs, copper oxide (CuO) nanotubes (NTs), and indium tin oxide (In₉₀Sn₁₀O₃ (ITO)) NPs) were systematically investigated toward different toxic industrial chemicals (TICs) (i.e.<em>,</em> nitrogen dioxide (NO₂), ammonia (NH₃), hydrogen sulfide (H₂S), carbon monoxide (CO), sulfur dioxide (SO₂) and volatile organic compounds (VOCs) (i.e.<em>,</em> acetone (C₃H₆O), toluene (C₆H₅CH₃), ethylbenzene (C₆H₅CH₂CH₃), and p-xylene (C₆H₄(CH₃)₂)) in the presence and absence of 400 nm UV light illumination.</p><p>Sensing performance enhancement through photoexcitation is strongly dependent on the target analytes. Under 400 nm UV photoexcitation at 76.0 mW/cm² intensity, room temperature (21±2 °C) NO₂ sensing was readily achieved where SnO₂ NPs exhibited the highest sensor response (<em>S</em> = 474.4 toward 10 ppm_m (parts per million by mass)) with good recovery followed by ZnO NPs &gt; In₂O₃ NPs &gt; ITO NPs. Meanwhile, indirect bandgap n-type WO₃ NPs showed limited NO₂ sensing performance under illumination, whereas p-type CuO NTs showed relatively good sensing response. The most significant improvements in SnO₂ compared to other MOS nanoparticles might be attributed to the highest number of photogeneration electrons, which rapidly reacted with adsorbed <span><math><mrow><mi>N</mi><msubsup><mi>O</mi><mn>2</mn><mo>−</mo></msubsup></mrow></math></span> species to enhance the reaction kinetics. WO₃ NPs showed a unique sensing response toward aromatic compounds (e.g., ethylbenzene and p-xylene) under UV illumination, where maximum sensitivity was achieved under 36 mW/cm² irradiation. Changing light intensity from 0.0 to 36.4 mW/cm², WO₃ showed 15.4-fold and 6.3-fold enhancement in sensing response toward 25 ppm_m ethylbenzene and 100 ppm_m p-xylene, respectively. 400 nm optical excitation has a limited effect on the sensing performance toward CO, SO_2, toluene, and acetone.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100194"},"PeriodicalIF":5.9,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000109/pdfft?md5=0eeb26cc61976edbc08e73fef27a62af&pid=1-s2.0-S2666053924000109-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140539614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanoplasmonic sensing for studies on liposomes and extracellular vesicles","authors":"Shishir Jaikishan,&nbsp;Marine Lavainne,&nbsp;Susanne K. Wiedmer","doi":"10.1016/j.snr.2024.100192","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100192","url":null,"abstract":"<div><p>Nanoplasmonic sensing (NPS) is a comparatively new and powerful technique, which is yet to achieve its full potential across various fields of sciences. The principle behind NPS is localized surface plasmon resonance. NPS has several advantages over traditional sensing techniques when it comes to selectivity, sensitivity, concentration of analyte required, and prohibitive costs involved. The phenomenon exhibits at the resolution depth between two and a few tens of nm, which is difficult in practice or expensive to attain with various modern microscopes. Additionally, NPS is a label free technique which can measure fast and real-time interactions at the solid-liquid interface. This review highlights the applications of NPS in lipid research and the emerging field of extracellular vesicles.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100192"},"PeriodicalIF":5.9,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000080/pdfft?md5=8df1e520ffdfe3c1645a0a4d4ed04a52&pid=1-s2.0-S2666053924000080-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140350780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced ozone gas detection with Sb doped ZnO nanorods synthesized on MEMS microheater","authors":"Yempati Nagarjuna ,&nbsp;Yu-Jen Hsiao ,&nbsp;Wen-Tse Hsiao ,&nbsp;Zheng-Xi Li ,&nbsp;Meichun Lin","doi":"10.1016/j.snr.2024.100191","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100191","url":null,"abstract":"<div><p>Metal oxide semiconductors infused with noble metals or metalloids are studied and employed in semiconductor sensors applications to a greater extent. In this study, antimony (Sb) is doped with ZnO in 4 different concentrations to compare the optimal parameters in gas sensing properties. Sb/ZnO nanostructure is synthesized by hydrothermal process and deposited on MEMS (Micro electro mechanical system) microheater device. The morphology of the nanostructure is analyzed for planar structure, oxidation states and the presence of Sb/ZnO is successfully verified. Ozone is a powerful oxidizing gas which is a health hazard in public places, so low concentrations of ozone is tested with Sb/ZnO sensor at various parameters. Since Sb acts as catalyst to promote the gas sensing properties, the sensor responses have been enhanced compared to pure ZnO sensor. Sensor performed its best at 200 °C and has the lowest detection gas concentration of 10 ppb. Sb/ZnO showed good selectivity over ozone gas.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100191"},"PeriodicalIF":5.9,"publicationDate":"2024-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000079/pdfft?md5=6c7d67d9e78aaef90afb98364f8dd800&pid=1-s2.0-S2666053924000079-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140320437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-cost high-resolution distributed optical fiber system for spectrophotometric analysis of liquid samples: Application to detection of azo dyes","authors":"Genni Testa,&nbsp;Gianluca Persichetti,&nbsp;Romeo Bernini","doi":"10.1016/j.snr.2024.100190","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100190","url":null,"abstract":"<div><p>A distributed optical fiber system for spectrophotometric analysis of liquid samples based on light diffusing fiber (LDF) is presented. The sensor is based on a high-density white light emitting diode (LED) strip, which is side coupled to a glass based light-diffusing fiber (LDF) that acts as distributed optical receiver. The light emitted from a single LED propagates through the sample medium, is collected by the LDF and is then detected at the end of the fiber by a mini spectrometer. By sequentially turning on one LED at a time, the system permits the spectrophotometric analysis of the sample medium along the entire fiber length. This approach is capable of a continuous monitoring of absorbance spatial profile of liquid sample in the whole visible spectrum with a single low-cost spectrometer. The experimental results confirm the possibility of distributed measurements with a spatial resolution of about 12 mm over 1 m of measurement range. The approach has been successfully employed to the distributed detection and localization of azo dyes in water with a limit of detection lower than 1 ppm.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100190"},"PeriodicalIF":5.9,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000067/pdfft?md5=8fa9515691ea2ca0e20085774cb67d4f&pid=1-s2.0-S2666053924000067-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140141586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent progress in per- and polyfluoroalkyl substances (PFAS) sensing: A critical mini-review","authors":"Dorian Thompson ,&nbsp;Niloofar Zolfigol ,&nbsp;Zehui Xia ,&nbsp;Yu Lei","doi":"10.1016/j.snr.2024.100189","DOIUrl":"10.1016/j.snr.2024.100189","url":null,"abstract":"<div><p>Per- and polyfluoroalkyl substances (PFAS) are a class of fluorinated pollutants found widely in numerous industrial and consumer products. Their excellent heat, oil, and water resistance and slow degradation rate in nature lead to their persistent environmental accumulation with potential adverse impacts on various organisms, including humans. Although the current EPA-approved PFAS detection method is elegant and ultrasensitive, its broader application is greatly limited due to the associated high costs, lengthy detection times, and skilled personnel requirements. Hence, there is a strong demand for rapid, robust, low-cost, and accessible PFAS detection methods to expedite the treatment of contaminated media and control exposure to these emerging substances. Since the publication of our first PFAS sensing review in 2021, numerous new PFAS sensors have been developed and reported. Consequently, this critical review primarily focuses on recent advancements in PFAS sensing platforms, encompassing optical-based, electrochemical-based, and other novel sensing principle-based systems, as well as those that complement liquid chromatography coupled with tandem mass spectrometry, the gold standard for PFAS detection. The underlying detection mechanisms, sensing performances, and potential areas for improvement are thoroughly discussed. We hope that this article offers readers a review of alternative PFAS detection systems developed in recent years and inspires future innovations in field-deployable PFAS sensing technology.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100189"},"PeriodicalIF":5.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000055/pdfft?md5=fe77429733566de3e62932f7d29854cb&pid=1-s2.0-S2666053924000055-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electric cell-substrate impedance sensing in cancer research: An in-depth exploration of impedance sensing for profiling cancer cell behavior","authors":"Hassan Moghtaderi ,&nbsp;Golfam Sadeghian ,&nbsp;Hamed Abiri ,&nbsp;Faizullah Khan ,&nbsp;Md Mizanur Rahman ,&nbsp;Ahmed Al-Harrasi ,&nbsp;Shaikh Mizanoor Rahman","doi":"10.1016/j.snr.2024.100188","DOIUrl":"10.1016/j.snr.2024.100188","url":null,"abstract":"<div><p>Impedance assessment in living biological cells has gained popularity as a label-free, real-time, and quantitative analytical approach for determining cellular states. Electric cell substrate impedance sensing (ECIS) provides valuable insights into cell adhesion, the intricate interactions between cells and their underlying substrate, and cellular communication. Further, the ECIS method's high sensitivity enables the observation of biological events at the single-cell level and the precise determination of cell-substrate distances at the nanoscale. Importantly, using cellular electrical properties as a valuable marker, ECIS can shed light on how cancer cells proliferate, migrate, and invade. In this article, we discuss electric cell-substrate impedance sensing as it relates to electrode design, manufacturing, and application in impedance measurement. The present review also outlines our current understanding of the advantages of ECIS in studying cancer cell behavior and drug screening and their prospective future modifications. Impedance-sensing approaches in biology have many potential applications, including point-of-need diagnostics, highly specialized devices, and seamless integration. In summary, this impedance-based technology might one day be an attractive diagnostic tool in cancer research.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100188"},"PeriodicalIF":5.9,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000043/pdfft?md5=187f7e1ca8bce2a58395e97d0b88ebae&pid=1-s2.0-S2666053924000043-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139921459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The graphene quantum dots encased in the molecularly imprinted polymer as a new fluorescent nanosensor for the detection of biotin","authors":"Parizad Mohammadnejad ,&nbsp;Seyed Mohamadreza Milani Hosseini ,&nbsp;Beheshteh Sohrabi","doi":"10.1016/j.snr.2024.100187","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100187","url":null,"abstract":"<div><p>In aqueous solution, a non-toxic fluorescent nanosensor incorporating graphene quantum dots encased in molecularly imprinted polymer (GQDs-encased in MIP) is manufactured through a straightforward sol-gel process. During the polymerization process, the functional monomer 3-aminopropyltriethoxysilane (APTES) and the cross-linker tetraethyl orthosilicate (TEOS) were utilized to bind the biotin in a polymer network. The resulting GQDs@MIP nanocomposite outperformed the similar non-imprinted polymer (GQDs-encased in NIP) in terms of biotin selectivity. Under ideal conditions, the produced GQD-encased in MIP are employed to detect biotin by quenching their fluorescence caused by the target analyte via photo induced electron transfer (PET). The quenching curves of each GQDs-encased in polymer were fitted with the Stern-Volmer-type equation, and GQDs-encased in MIP had a broader linear range and a lower limit of detection than GQDs-encased in NIP. GQDs-encased in MIP fluorescence response is linear with respect to biotin concentration over a wide linear range of at least 0.4 μmol <em>L</em> ⁻ ¹ to 6.7 μmol <em>L</em> ⁻ ¹. The detection limit for biotin determination was 315 nmol <em>L</em> ⁻ ¹. The suggested GQDs-encased in MIP is promising for the measurement of trace biotin in human serum samples because to its non-toxicity, simplicity, and low cost, as well as its strong analytical performance.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100187"},"PeriodicalIF":5.9,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000031/pdfft?md5=4ad9546815ca2631f7ac78bff6169dd6&pid=1-s2.0-S2666053924000031-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139748978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser-Induced graphene-based Fabry-Pérot cavity label-free immunosensors for the quantification of cortisol","authors":"Hugo Coutinho Gomes ,&nbsp;Xuecheng Liu ,&nbsp;António Fernandes ,&nbsp;Catarina Moreirinha ,&nbsp;Ragini Singh ,&nbsp;Santosh Kumar ,&nbsp;Florinda Costa ,&nbsp;Nuno Santos ,&nbsp;Carlos Marques","doi":"10.1016/j.snr.2024.100186","DOIUrl":"https://doi.org/10.1016/j.snr.2024.100186","url":null,"abstract":"<div><p>There is a strong and growing need to monitor stress biomarkers in human beings and animals for real-time wellness assessment, which is a key indicator of health. Toward this, we report an optical fiber immunosensor based on laser-induced graphene (LIG) for the potential quantification and monitoring of cortisol hormone. The developed sensors were created using the Fabry-Pérot cavity principle. The cavities were filled with polyimide (PI) and, in some cases, PI mixed with gold nanoparticles. The interferometers were tested for temperature and refractive index, and an increase of two times in the sensitivity to the refractive index was observed due to the addition of the gold nanoparticles. In addition, the PI cavity was partially transformed into LIG using a CO₂ 20 kHz pulsed laser. The resulting LIG morphology was quite porous and presented a leafy texture. The presence of LIG creates a second cavity within the interferometer, and as a consequence, the spectral response of the interferometers resembled the Vernier effect. The refractive index behavior of the LIG-modified interferometers shows improvements in sensitivity up to 15.3 times due to the creation of the LIG cavity. The interferometers were then functionalized with anti-cortisol to promote an affinity for cortisol. Excellent sensitivities of up to -34.7 ± 0.7 nm/log(ng/mL) were achieved within few ng/mL concentration ranges (within the 0.5 to 3 ng/mL). The results obtained show an increase of up to 50 times in sensitivity when compared with other cortisol sensors. The achieved limit of detection was 0.1 ng/mL for the proposed sensors. The sensors’ responses were also shown to be immune to the interference from substances such as glucose, sucrose, fructose, and ascorbic acid. This study lays the foundation for new cortisol biosensors demonstrating a great potential for detection in a simple and highly sensitive way, opening its path for relevant biomedical and environmental monitoring applications in real samples. As a future outline, selectivity studies employing the detection of cortisol in the presence of interfering agents, both using synthetic and real samples, will be accomplished in order to fully investigate the potential of these sensing tools in real-life scenarios.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100186"},"PeriodicalIF":5.9,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266605392400002X/pdfft?md5=f8de91b271ec83e5be5ff02dd833e500&pid=1-s2.0-S266605392400002X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139505449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Room temperature hydrogen sulfide gas detection using copper oxide nanotube/indium tin oxide nanoparticle heterojunctions","authors":"Suporna Paul ,&nbsp;Emily Resendiz Mendoza ,&nbsp;Dung Thi Hanh To ,&nbsp;Thien Toan Tran ,&nbsp;Thomas Stahovich ,&nbsp;Jennifer Schaefer ,&nbsp;Nosang V. Myung","doi":"10.1016/j.snr.2024.100185","DOIUrl":"10.1016/j.snr.2024.100185","url":null,"abstract":"<div><p>Various copper oxide nanotube/indium tin oxide (CuO/ITO) nanocomposite-based chemiresistive gas sensors were fabricated and tested toward hydrogen sulfide (H₂S) in the presence and absence of ultra-violet (UV) light excitation at room temperature. Among these different combinations, 60:40 wt.% of CuO:ITO showed the highest sensing performance toward H₂S gas (i.e.<em>,</em> sensor response (<em>S)</em> = 5.7 toward 40 ppm_m (parts per million by mass) H₂S gas), which is ̴5.7 times higher than pristine CuO and ITO counterparts. The enhancement in the gas sensing performance by mixing ITO and CuO nanostructures might be due to the formation of p/n heterojunction between ITO nanoparticles and CuO nanotubes. The low limit of detection (LLOD) of 500 ppb_m (part per billion by mass) of <em>S</em> = 1.2 was experimentally achieved by photo exciting sensing materials using 400 nm UV light. This might be attributed to the faster adsorption of H₂S molecules and higher carrier concentration under light illumination. These sensors also maintained good H₂S sensing performance in the presence of water vapors which makes these sensors suitable for practical application. This work paves a way to fabricate low-power H₂S gas sensors by eliminating heaters.</p></div>","PeriodicalId":426,"journal":{"name":"Sensors and Actuators Reports","volume":"7 ","pages":"Article 100185"},"PeriodicalIF":5.9,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666053924000018/pdfft?md5=81b380cc4bd20ff9f21f22067f38ae5d&pid=1-s2.0-S2666053924000018-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139082712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}