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Active {1?1?1}-faceted ultra-thin NiO single-crystalline porous nanosheets supported highly dispersed Pt nanoparticles for synergetic enhancement of gas sensing and photocatalytic performance
摘要： Proper morphology, surface and interface structure designing are required to obtain e?cient gas sensing and photocatalytic materials. In the present work, ultra-thin NiO single-crystalline porous nanosheets with dominant {1 1 1} crystal facets (denoted as SP-NiO) and hierarchical NiO porous microspheres (denoted as HP-NiO) supported highly dispersed Pt nanoparticles with controllable sizes were designed and synthesized. Their gas sensing and photocatalytic performance were investigated. It was found that both the formaldehyde sensing and methyl orange photocatalytic degradation performance were greatly enhanced by decorating Pt nanoparticles on SP-NiO, while Pt nanoparticles decoration contributed little to the improved photocatalytic performance of HP-NiO. The results indicated that surface structure of the NiO support could also produce signi?cant impact on the activity of Pt/NiO heterojunctions. Moreover, Pt decorated SP-NiO with stable structure showed a marked long-term stability with negligible attenuation of gas sensitivity (less than 5%) for 45 days, while Pt decorated HP-NiO exhibited obvious attenuation of gas sensitivity (more than 30%) due to the structural collapse. The work not only o?ers promising materials for gas sensing and photocatalytic application, but also brings new dawn for the designing of e?cient p-type metal oxides gas sensing and photocatalytic materials through the synergistic e?ect of single-crystalline porous structures modulation, crystal facets engineering and facet-selective deposition of highly-dispersed Pt nanoparticles.
关键词： Photocatalysis,Ultra-thin,{1 1 1} crystal facets,NiO,Gas sensing
更新于2025-09-10 09:29:36
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Gas Sensing Mechanism of Silica with Photonic Bandgap Shift
摘要： Two physical models, Replacing model and Filling model, have been proposed to explain the mechanism of effective refractive index change of photonic crystals (PCs). Theoretically, photonic bandgap (PBG) would shift when PCs are exposed to different environment, which leads to change of effective refractive index of PCs. However, the mechanism of effective refractive index change is distinct when PCs are placed in different gases or vapors. Here, silica PCs were successfully fabricated by self-assembled method. The PGB of silica PCs exhibit similar redshift in volatile organic compounds (VOCs) or small-molecule gases. We propose Replacing model to elaborate silica PCs exposed to VOCs, while Filling model to explain silica PCs exposed to small-molecule gases. Additionally, the redshift of PBG was transformed into volume fraction of adsorbed gas in order to achieve selective sensing of silica PCs. The approach could be exploited for application in sensing.
关键词： refractive index,photonic crystals,photonic bandgap,silica,gas sensing
更新于2025-09-10 09:29:36
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Synthesis of Sn-doped ZnO hierarchical particles and their gas-sensing properties
摘要： In this work, un-doped and Sn-doped hierarchical ZnO particles with high dispersity were successfully fabricated by a facile liquid reaction. The prepared samples are characterised by X-ray diffraction and scanning electron microscopy. The as-synthesised hierarchical ZnO particles with a diameter of ～1.5 μm were obtained by considerably intersecting thin nanosheets of ～20 nm thickness. The morphology of ZnO structures can be varied by adjusting reaction parameters, e.g. reaction temperature, calcination temperature, and dopant concentration. On the basis of experimental results, the gas-sensing measurement displays that the sensor based on Sn-doped ZnO microstructures have a low detection of 10 ppm ethanol at an operational temperature of 250°C, demonstrating its outstanding gas-sensing performance. Therefore, the ?ower-like Sn-doped ZnO have prospective applications in a multifunction ethanol sensor. Moreover, the fabrication method reported in the work is facile, ?exible and operable, it is possible to extend to synthesise other types of metal oxide-based applications in various ?elds.
关键词： Sn-doped ZnO,hierarchical particles,facile liquid reaction,gas-sensing properties,ethanol sensor
更新于2025-09-10 09:29:36
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[IEEE 48th European Solid-State Device Research Conference (ESSDERC 2018) - Dresden (2018.9.3-2018.9.6)] 2018 48th European Solid-State Device Research Conference (ESSDERC) - Towards IC-based quantum sensing - recent achievements and future research trends
摘要： This paper describes some of the recent trends in the use of integrated circuit (IC) technology for the design of smart quantum sensors. To this end, after a brief introduction into the topic of quantum sensing including its intrinsic advantages and associated challenges, a number of emerging applications including the fields of IC-based inductive electron and nuclear spin detection as well as Rydberg gas sensing and NV center based sensing are used to highlight the great potential of the IC-based quantum sensing approach.
关键词： integrated circuit,quantum sensing,NV center based sensing,inductive electron and nuclear spin detection,smart quantum sensors,Rydberg gas sensing
更新于2025-09-09 09:28:46
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Improving gas sensing by CdTe decoration of individual aerographite microtubes
摘要： Novel gas sensors have been realized by decorating clusters of tubular Aerographite with CdTe using magnetron sputtering techniques. Subsequently, individual microtubes were separated and electrically contacted on a SiO2/Si substrate with pre-patterned electrodes. Cathodoluminescence, electron microscopy and electrical characterization prove the successful formation of a polycrystalline CdTe thin film on Aerographite enabling an excellent gas response to ammonia. Furthermore, the dynamical response to ammonia exposure has been investigated, highlighting the quick response and recovery times of the sensor, which is highly beneficial for extremely short on/off cycles. Therefore, this gas sensor reveals a large potential for cheap, highly selective, reliable and low-power gas sensors, which are especially important for hazardous gases such as ammonia.
关键词： ammonia,electron microscopy,nanocomposite,hybrid material,gas sensing
更新于2025-09-09 09:28:46
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ZnO Nanostructure Based QCM Sensor to Detect Ethanol at Room Temperature Fabricated by All Wet Process
摘要： QCM is one of major sensing methods for volatile organic compounds (VOC) at room temperature. Nanostructure is effective to increase the sensitivity because of its large surface area. We introduced ZnO nanostructure to detect ethanol gas. ZnO nanostructure was fabricated by all wet process such as electrodeposition and chemical bath deposition (CBD). In this case, seed layer was obtained by electrodeposition, and nanostructure was formed by the CBD. The thickness of seed layer was controllable by charge amount on the electrodeposition, and that of nanostructure was controllable by deposition time on the CBD. As the results, the sensitivity increased with the thickness of the seed layer when the deposition time on CBD was set as 30 min. These results indicate that we can obtain high sensitive VOC sensor by using all wet process which is fit to large scale production with cost-effective.
关键词： nanostructure,QCM,gas sensing
更新于2025-09-09 09:28:46
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Planar Microstrip Ring Resonator Structure for Gas Sensing and Humidity Sensing Purposes
摘要： A planar microstrip ring resonator structure on alumina was developed. It was covered with a zeolite film. The device was successfully operated at around 8.5 GHz at room temperature as a humidity sensor. In the next step, an additional planar heater will be included on the reverse side of the resonator structure to allow for testing of gas sensitive materials under sensor conditions.
关键词： zeolite in operando spectroscopy,radio frequency gas sensing (RF),microwave sensors
更新于2025-09-09 09:28:46
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Progresses in Chemical Sensor || Air-Suspended Silicon Micro-Bridge Structures for Metal Oxide- Based Gas Sensing
摘要： Maintaining specific temperature is a key parameter for most of the gas sensing materials, particularly for metal oxide-based thin film layers, to operate them more efficiently to detect different gaseous (or vapor) species at ppm and ppb concentration levels. For field applications, battery-operated micro-gas-sensors, power dissipation and the required temperature stability are to be maintained with a close tolerance for better signal stability and also to analyze the generated data from the sensing element. This chapter mainly focuses on several metal oxide films to highlight the base temperature and its creation on silicon-based platforms. Air-suspended structures are highlighted, and a comparison is drawn between simple and MEMS-based structures from the power dissipation point of view. Ease of fabrication and operation limitations are explained with fabrication issues.
关键词： Platinum resistance thermometer,Gas sensing devices,Platinum micro-heater,Surface micromachining,MEMS,Metal oxide thin films
更新于2025-09-09 09:28:46
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Gas Sensing Characterization of Single-Nanowire Sensor Array Systems Based on Non-Functionalized and Pt-Functionalized Tungsten Oxide
摘要： Here we present the gas sensing characterization of single-nanowire sensor array systems based on either non-functionalized or Pt-functionalized single tungsten oxide nanowires towards various concentrations of nitrogen dioxide and ethanol. The sensor systems demonstrate stable and reproducible responses to the tested analytes, showing consistency with previous systems based on multiple-nanowire based films and validating the fabrication process of these devices.
关键词： sensor array,single-nanowire,tungsten oxide,gas sensing
更新于2025-09-09 09:28:46
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Core-Shell Electrospun Polycrystalline ZnO Nanofibres for Ultra-Sensitive NO2 Gas Sensing
摘要： This paper discusses the growth of polycrystalline, self-supporting ZnO nanofibres which can detect nitrogen dioxide (NO2) gas down to 1 part per billion (ppb), one of the smallest detection limits reported for NO2 using ZnO. A new and innovative method has been developed for growing polycrystalline ZnO nanofibres. These nanofibres have been created using core-shell electrospinning of inorganic metal precursor zinc neodecanoate, where growth occurs at the core of the nanofibres. This process produces contamination-free, self-supporting, polycrystalline ZnO nanofibres of the average diameter and grain size 50 nm and 8 nm respectively, which are ideal for gas sensing applications. This process opens up an exciting opportunity for creating nanofibres from a variety of metal oxides, facilitating many new applications especially in the areas of sensors and wearable technologies.
关键词： NO2 gas sensing,polycrystalline fibres,ZnO nanofibres,Electrospinning
更新于2025-09-09 09:28:46