Sensors and Actuators B: Chemical最新文献

{"title":"Construction of homologous cations SnO2/SnS heterojunction for ultra-sensitive NO detection","authors":"Tongtong Cheng,&nbsp;Yiqi Tang,&nbsp;Heping Zhang,&nbsp;Xingqi Song,&nbsp;Gongcheng Xu,&nbsp;Ying Zhou,&nbsp;Xinghui Hou","doi":"10.1016/j.snb.2025.138040","DOIUrl":"10.1016/j.snb.2025.138040","url":null,"abstract":"<div><div>SnO₂ is an n-type wide band gap (E_g = 3.6 eV) metal oxide semiconductor (MOS) that has been widely studied, due to its low cost, non-toxicity and simple preparation process, and it has become the most important sensitive material for the preparation of gas sensors. However, the SnO₂ sensor still has some defects of high operating temperature and low response, which hinders its practical application. In this work, SnO₂/SnS composites were prepared by hydrothermally growing SnS nanoparticles on the surface of electrospun hollow SnO₂ nanotubes with high porosity. Results show that the SnO₂/SnS gas sensor based on the heterojunction has a much higher response of 375 to 50 ppm NO at 130 ℃ than that of pure SnO₂ sensor, as well as rapid response/recovery (26 s/90 s), excellent selectivity (12 times that of H₂S), repeatability and stability (225–250 to 20 ppm NO). Its enhanced sensing property may be attributed to the synergistic effect of the formation of homologous cations heterojunction and unique micro-structure of SnO₂/SnS composite, which could facilitate efficient charge transfer and provide more active sites (such as vacancy, point defects) for NO adsorption and reaction. This experiment provides a new idea for the development of SnO₂ gas sensors with excellent properties, which can meet the detection of toxic and harmful gas.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138040"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A quinolinium-functionalized hemicyanine dye for ratiometric NAD(P)H sensing in live cells, kidney tissues, and Drosophila melanogaster","authors":"Sushil K. Dwivedi ,&nbsp;Henry Lanquaye ,&nbsp;May Waters ,&nbsp;Adonis Amoli ,&nbsp;Crystal Wang ,&nbsp;Peter Agyemang ,&nbsp;Omowunmi Rebecca Aworinde ,&nbsp;Tyler Gregersen ,&nbsp;Micaela Geborkoff ,&nbsp;Yan Zhang ,&nbsp;Athar Ata ,&nbsp;Thomas Werner ,&nbsp;Haiying Liu","doi":"10.1016/j.snb.2025.138043","DOIUrl":"10.1016/j.snb.2025.138043","url":null,"abstract":"<div><div>NAD⁺ (Nicotinamide adenine dinucleotide) and NADP⁺ (its phosphorylated variation) are key coenzymes regulating cellular metabolism, biosynthesis, and redox balance. Variations in NAD(P)H activity reflect metabolic activity and are associated with diseases like cancer, metabolic disorders, and neurodegeneration. Live tracking of NAD(P)H is important for comprehending these processes and their dysregulation in disease. However, existing ratiometric emission sensors are hindered by spectral interference from NADH emission, limiting their sensitivity and accuracy in complex biological systems. We present a ratiometric emission sensor based on a 3-quinolinium-hemicyanine dye with amine linkage, designed to address these limitations. By using a longer excitation wavelength (470 nm), the sensor avoids interference from NADH emission, enabling precise monitoring of NAD(P)H activity. Binding to NAD(P)H triggers a photo-induced electron transfer (PET) mechanism, resulting in an increase in visible emission at 519 nm and subtle reduction in near-infrared emission at 711 nm, providing a clear ratiometric signal. We demonstrate the sensor’s effectiveness in live cells, tissues, and whole organisms. In HeLa cells, exposure to glucose, maltose, fludarabine or cisplatin induced dose-dependent ratiometric emission changes, reflecting metabolic shifts and oxidative stress. The sensor also successfully detected NAD(P)H fluctuations in <em>Drosophila melanogaster</em> larvae and mammalian kidney tissues, including disease models like ADPKD (autosomal dominant polycystic kidney disease). Importantly, the sensor can distinguish NAD(P)H dynamics from high NADH levels, overcoming a key limitation of current sensors. Co-localization with a mitochondrial dye confirmed the sensor’s selective targeting to mitochondria, highlighting its suitability for studying mitochondrial energy processes and redox changes. This ratiometric sensor provides a sensitive, interference-free tool for live tracking of NAD(P)H kinetics in complex biological systems. Its high sensitivity, accuracy, and versatility offer new opportunities for investigating cellular metabolism, disease mechanisms, and therapeutic interventions in both cellular and <em>in vivo</em> models.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"442 ","pages":"Article 138043"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CoTsPc assisted PANI functionalized Ti3C2Tx MXene gas sensor for ppb-level NO detection at room temperature","authors":"Kun Zeng ,&nbsp;Xiaolin Wang ,&nbsp;Xinyi Wang ,&nbsp;Runze Zhang ,&nbsp;Bin Wang","doi":"10.1016/j.snb.2025.138033","DOIUrl":"10.1016/j.snb.2025.138033","url":null,"abstract":"<div><div>The massive emission of NO presents a significant risk to both human health and ecological systems. Given its strong reactivity and oxidizing properties, traditional NO gas sensors are no longer able to meet the growing demand for applications. Consequently, designing and developing room-temperature NO sensors with high response, low detection limit, and distinct selectivity is crucial. Herein, a MXene/CoTsPc-PANI gas sensor with excellent performance was constructed using a convenient and environmentally friendly aqueous phase synthesis strategy. It uses a few-layered Ti₃C₂T_x MXene as the conductive substrate material, and utilizes π-π and electrostatic bidirectional interactions to efficiently assemble Cobalt(II) tetra-β-sulfophthalocyanine-polyaniline (CoTsPc-PANI) into the MXene matrix. CoTsPc-PANI functionalized modification of MXene resulted in faster charge migration behavior, numerous active sites, and a significant specific surface area. In particular, the MXene/1.0CoTsPc-0.4PANI sensor exhibits extremely high NO sensitivity (LOD=45.8 ppb), unique selectivity (selectivity coefficient for NO₂ is 23.5), and high response (R_(100 ppm _NO)= 244.7 %, 45, 24 and 31 times the response of MXene, PANI and CoTsPc sensors, respectively) at room temperature. At the same time, the MXene/1.0CoTsPc-0.4PANI sensor showed excellent accuracy in aiding the detection of NO content in vehicle exhaust (6.9 % relative error to measurements taken at automobile inspection stations). Finally, the MXene/1.0CoTsPc-0.4PANI flexible gas sensor exhibits the same excellent NO sensing performance as the above sensors (relative error &lt;3.0 %). This study provides new ideas for designing MXene-based sensing materials with potential applications in automotive exhaust NO content detection and flexible gas sensors.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138033"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A fluorescence/colorimetric/smartphone three-channel sensor array based on XSQ-CDs(Fe) for efficient and precise identification of goji berry origin","authors":"Linjie Wang ,&nbsp;Yang Ji ,&nbsp;Lu Wang ,&nbsp;Xiaoya Liu ,&nbsp;Lajiatai ,&nbsp;Dongzhi Suonanmu ,&nbsp;Qingjia Ren ,&nbsp;Fei Wang ,&nbsp;Caolong Li","doi":"10.1016/j.snb.2025.138042","DOIUrl":"10.1016/j.snb.2025.138042","url":null,"abstract":"<div><div>Rapid and accurate identification of Chinese wolfberries (Goji) origin is of great significance for the quality supervision of goji and the protection of consumer rights. In this research, as-synthesized XSQ-CDs(Fe) with excellent peroxidase-like activity can catalyze colorless TMB to form blue oxidation product (TMBox) which can inhibit the intrinsic fluorescence of XSQ-CDs(Fe) owing to inner filter effect (IFE). However, some antioxidants can inhibit the catalytic oxidation of TMB into TMBox, resulting in partial recovery of intrinsic fluorescence of XSQ-CDs(Fe) and gradual decrease of UV–vis signal corresponding to TMBox, accompanied by visible color variations in the system. Intriguingly, different antioxidants have diverse responses to the fluorescence, UV–vis, and color signals of whole system. By coupling linear discriminant analysis (LDA) and hierarchical clustering analysis (HCA) means, a fluorescence, colorimetric, and smartphone three-channel sensor array based on XSQ-CDs(Fe) has been fabricated for the quantification and differentiation of GSH, AA, and Cys. More significantly, this three-channel sensor array can be applied to accurately distinguish the origin of each goji based on their antioxidant content, supplying powerful technical support for the quality supervision of goji berries and even other foods.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138042"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature-turned dual-selective nitric dioxide/hexanol sensor based on graphitic carbon-modified ZnO tubes synthesized by camphor wood template","authors":"Yuan-Yuan Sun,&nbsp;Yu-Ying Xin,&nbsp;Guo-Li Chen,&nbsp;Xian-Fa Zhang,&nbsp;Zhao-Peng Deng,&nbsp;Ying-Ming Xu,&nbsp;Li-Hua Huo,&nbsp;Shan Gao","doi":"10.1016/j.snb.2025.138049","DOIUrl":"10.1016/j.snb.2025.138049","url":null,"abstract":"<div><div>How to develop a multifunctional gas sensor is great challenge owing to the vast majority of reports for only monitoring one harmful gas. For this purpose, based on the economy-friendly engineering strategy, two kinds of tubular materials were simply synthesized by calcining zinc salt immersed camphor wood slices in air. Among them, the GC/ZnO tubular morphology obtained by sintering at 425 °C was assembled from 5.1 wt% <em>in-situ</em> generated graphitic carbon (GC) and small-size ZnO nanoparticles, which possesses hierarchical mesoporous distribution, large specific surface area and abundant oxygen vacancies. The synergistic effect of the above factors can promote the diffusion of gas molecules, expose more reactive sites, and modulate the state of surface adsorbed oxygen species, thereby efficiently improving its sensitive ability to two types of hazardous gases. At low temperature of 50 °C, the response of GC/ZnO sensor for 10 ppm NO₂ gas is as high as 880, and it exhibits response of 218 toward 100 ppm <em>n</em>-hexanol vapor at 252 °C. At the meantime, the sensor shows other good comprehensive gas-sensing properties. This is the first report of a chemiresistive sensor that simultaneously enables dual-selectivity of NO₂ and <em>n</em>-hexanol. Furthermore, the temperature-turned sensing mechanism is also explored in detail.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138049"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MOF-derived Bi2O3/In2O3 hollow nanotube heterojunctions: A synergistic platform for ultra-sensitive H2S sensing with ppb detection and rapid recovery","authors":"Shaobin Yang ,&nbsp;Zhen Sun ,&nbsp;Huilin Sun ,&nbsp;Peishuo Wang ,&nbsp;Ziwen Yang ,&nbsp;Tangyin Cui ,&nbsp;Lanlan Guo ,&nbsp;Xueli Yang","doi":"10.1016/j.snb.2025.138054","DOIUrl":"10.1016/j.snb.2025.138054","url":null,"abstract":"<div><div>Hydrogen sulfide(H₂S), as a highly toxic gas, is crucial for real-time monitoring of the atmospheric environment, so it is particularly important to prepare sensors with fast response/recovery and low detection limits. In this study, MOF-derived Bi₂O₃/In₂O₃ hollow nanotube heterojunctions were developed for ultrasensitive H₂S detection. Due to the formation of p-n heterojunctions and abundant oxygen vacancies, the Bi₂O₃/In₂O₃ sensing material exhibits excellent H₂S sensing performance. 5 wt% Bi₂O₃ modified In₂O₃ significantly improves the recovery characteristics with the degree of recovery elevated from 25 % to 100 %, which overcomes the problem of poor recovery of the H₂S sensors at the present stage. At the same time, 5 wt% Bi₂O₃/In₂O₃ also has a high response (40.4–10 ppm), low detection limit (50 ppb), excellent selectivity, excellent cyclability and long-term stability. In addition, the Bi₂O₃ loading significantly improves the humidity resistance of the pristine In₂O₃, maintaining a response of 60 % of normal humidity at 80 %RH, which suggests that the sensor has the potential to operate in high humidity environment. The rational configuration of the Bi₂O₃ and In₂O₃ heterojunction interface facilitates the electron transfer and the activation of the oxygen on the surface, which leads to the improvement of the gas sensing performance. This work provides a new strategy for the preparation of high-performance H₂S sensing materials, which can help to solve the problems of high detection limit, poor selectivity, and difficult recycling of H₂S sensors, and has a wide range of applications in the field of environmental monitoring.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138054"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Superior hydrogen gas detection of the AlGaN/GaN HEMT device enabled by PTFE decoration and alloy strategy","authors":"Aihua Zhong ,&nbsp;Yangquan Liu ,&nbsp;Zhiheng Ma ,&nbsp;Jingting Luo ,&nbsp;JiaQiang Xu","doi":"10.1016/j.snb.2025.138050","DOIUrl":"10.1016/j.snb.2025.138050","url":null,"abstract":"<div><div>Palladium (Pd) is rather attractive for hydrogen (H₂) gas detection, however, the Pd based gas sensors surfers from serious hysteresis. Herein, we proposed to utilize an Au₃₀Pd₇₀ alloy, instead of the Pd, to construct an Au₃₀Pd₇₀-gate AlGaN/GaN device based H₂ gas sensor. Results show that the hysteresis is pronouncedly suppressed from <span><math><mo>±</mo></math></span>8.0 % to <span><math><mo>±</mo></math></span>3.3 %. Moreover, polytetrafluoroethylene (PTFE) was decorated on the Au₃₀Pd₇₀ alloy gate to assist the adsorption and detection of the H₂ gas. It is found out that a 10 nm thick decoration of PTFE could significantly shortens the response time. Density functional theory (DFT) and Grand Canonical Monte Carlo (GCMC) methods were utilized to reveal the underlying mechanism of the PTFE decoration. Interestingly, the simulation results reveal that PTFE can not only act as a potential trap to accelerate the transportation of H₂ molecules from air to the PdAu surface, but the unsaturated PTFE chains in the PTFE layer can also alter the electronic structure of the PdAu surface, thereby accelerating the dissociation of H₂ molecules and significantly speeding up the detection process. The synergistic effect of these two phenomena could significantly shorten the response time and enhance the response values, providing novel strategy for superior gas sensors.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138050"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Label-free CRISPR/Cas12a fluorescent aptasensor for AFB1 detection based on guanine nanowire assisted three dimensional DNA networks with catalytic hairpin assembly","authors":"Dandan Xu,&nbsp;Luna Guo,&nbsp;Zishuo Xie,&nbsp;Peng He,&nbsp;Weiling Song,&nbsp;Hong Zhou","doi":"10.1016/j.snb.2025.138041","DOIUrl":"10.1016/j.snb.2025.138041","url":null,"abstract":"<div><div>Aflatoxin B1 (AFB1) is a typical mycotoxin in contaminated grain and food, posing carcinogenic and harmful threats to human health. Exploiting sensitive analytical method for AFB1 determination is especially important. Herein, a label free CRISPR/Cas12a derived fluorescence aptasenor was constructed to detect AFB1 using G-wire assisted DNA tetrahedral catalytic hairpin assembly (CHA) system as signal amplification strategy and crystal violet (CV) stained G-quadruplex (G4) as signal reporter. The aptamer was designed to not only recognize target but also activate CRISPR/Cas12a system. In the presence of target, the binding of aptamer to AFB1 was occurred to suppress the trans-cleavage activity of CRISPR/Cas12a, resulting the three-dimensional DNA network aggregation. Owing to the automatic CHA process, the free G4 sequences were self-assembled into G-wire superstructure by the introduction of Mg^2 +. As a result, the detection limit of AFB1 reached 0.84 pg/mL, with a liner range of 0.001 – 50 ng/mL. In addition, the proposed aptasenor also achieved excellent selectivity, reproducibility, stability and recoveries (97 − 101.3 %), making it promising for food quality testing.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138041"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spontaneous formation of plasmonic nanoparticles by transition metal dichalcogenides for SERS biosensing with deep learning analysis","authors":"Wansun Kim ,&nbsp;Woo Jeng Kim ,&nbsp;Hyerin Lee ,&nbsp;Gi-Ja Lee ,&nbsp;Kyung Min Byun ,&nbsp;Taesung Joo ,&nbsp;Yeon-Hee Kim ,&nbsp;Sang Woong Moon ,&nbsp;Samjin Choi","doi":"10.1016/j.snb.2025.138056","DOIUrl":"10.1016/j.snb.2025.138056","url":null,"abstract":"<div><div>The demand for deep learning-based surface-enhanced Raman scattering (SERS) sensing, which requires rapid processing of large datasets, has been increasing. This has highlighted the critical need for uniform hotspot regions with enhanced sensitivity. We assessed the difference between the redox potential of the electrolytes and the Fermi level of the semiconductors. Plasmonic nanoparticles were synthesized through the reduction of gold ions in the electrolyte. This was achieved without additional reductants and facilitated by electrons generated at the semiconductor-liquid interface. Further, the incorporation of surfactants promoted the formation of large-area multi-layered gold nanoparticles and significantly enhanced the SERS effect. We assessed the solid-state properties of various transition metal dichalcogenides, investigated the efficiency of area multi-layered gold nanoparticle formation in equilibrium with the electrolytes, and observed an optimized large-area SERS effect that enabled the rapid mobilization of large datasets. This approach demonstrates the feasibility of employing deep learning algorithms to assess the prognosis of neovascular age-related macular degeneration and diagnose early-stage gestational diabetes mellitus by analyzing human biological fluids. Our study highlights the practical potential of high-speed SERS biosensing for material analysis and next-generation non-invasive medical diagnosis.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138056"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ grown CuO/TiO2 vertical bilayer nanorods array for sensitive CO detection at lower temperature","authors":"Rushun Xue ,&nbsp;Lingmin Yu ,&nbsp;Man Gong ,&nbsp;Chuantao Zhang ,&nbsp;Senlin Li ,&nbsp;Shanglin Yang ,&nbsp;Xuefeng Xiao ,&nbsp;Ning Nan ,&nbsp;Chun Li ,&nbsp;Xinhui Fan","doi":"10.1016/j.snb.2025.138047","DOIUrl":"10.1016/j.snb.2025.138047","url":null,"abstract":"<div><div>CuO is a typical p-type semiconductor with the advantage of narrow bandgap, making it a gas sensing material for detecting CO gas at lower operating temperatures.However, the poor response value limits its application. As a classical wide-band gap n-type gas sensing metal oxide semiconductor, TiO₂ has the advantages of high response to CO. However, high operating temperature becomes the big obstacle to overcome. Therefore, sensitive CO detection at lower temperature will be achieved by integration of CuO with TiO₂. In this paper, in-situ two step hydrothermal method was used to prepare CuO/TiO₂ vertical bilayer nanorod arrays grown in situ. The gas sensing results show that the response value of the CuO/TiO₂ vertical bilayer nanorod arrays is 6.1 times (14.9, 300 ppm) higher than that of single CuO nanotentacle arrays (2.1, 300 ppm), and the operating temperature is reduced to 100 °C compared with pure TiO₂ nanorod arrays (360 °C). This strategy provides a new idea for the fabrication of CO gas sensors with high response and low operating temperature.</div></div>","PeriodicalId":425,"journal":{"name":"Sensors and Actuators B: Chemical","volume":"441 ","pages":"Article 138047"},"PeriodicalIF":8.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}