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Metal–Organic Framework-Assisted Construction of TiO <sub/>2</sub> /Co <sub/>3</sub> O <sub/>4</sub> Highly Ordered Necklace-like Heterostructures for Enhanced Ethanol Vapor Sensing Performance
摘要： In this work, we report a metal-organic frameworks (MOFs)-assisted strategy to synthesize necklace-like TiO2/Co3O4 nanofibers with highly ordered heterostructures via a facile approach including electrospinning and subsequent calcination. Polycrystalline TiO2 nanofiber and Co3O4 nanocage are consummate interconnected to form highly ordered heterogeneous nanostructure, which can be benefit for precisely accommodating the interface resistance of the p-n heterojunctions and future realization of improved materials performance. The ethanol gas-sensing investigation showed that TiO2/Co3O4 nanofibers sensors exhibited high ethanol response (Rair/Rgas -1 = 16.7 @ 150 ppm) and low operating temperature of 150 °C. The sensing enhancement mechanism of the TiO2/Co3O4 nanofibers is related to the formation of heterojunction at interfaces and the high catalytic activity of MOF-derived Co3O4. Furthermore, this versatile method is a promising approach to construct ordered heterostructures and extend the MOF-based heterogeneous materials toward wide applications.
关键词： Ordered Heterostructures,MOF-assisted,Ethanol vapor detect,Heterogeneous Nanofiber,Gas sensor
更新于2025-09-10 09:29:36
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High performance acetone sensor based on γ-Fe<sub>2</sub>O<sub>3</sub>/Al-ZnO nanocomposites
摘要： Ternary nanocomposites made of γ-iron oxide and aluminium-doped zinc oxide (γ-Fe2O3/Al-ZnO NCs), with different metal oxides ratio (0-100%) were prepared through a solvothermal sol-gel process. The synthesized γ-Fe2O3/Al-ZnO NCs were employed to prepare conductometric gas sensors, then their sensing performances toward acetone were also investigated. Results revealed enhanced sensing performance of nanocomposites than both pure γ-Fe2O3 and Al-ZnO phases. In particular, the γ-Fe2O3(33%)/Al-ZnO based gas sensor showed the best sensing properties, like a high response of Rair/Rgas = 29, a short response time of 3 s, in addition to an improved selectivity toward acetone vs. ethanol at an operating temperature of 200 °C. Overall, ternary γ-Fe2O3/Al-ZnO NCs appear to be promising for the development of conductometric acetone sensors.
关键词： Nanocomposite,Iron oxide,Aluminium doped zinc oxide,γ-Fe2O3,Al-ZnO,Acetone,Gas sensor
更新于2025-09-10 09:29:36
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Physisorption induced p-xylene gas-sensing performance of (C4H9NH3)2PbI4 layered perovskite
摘要： A novel organic-inorganic layered perovskite compound (C4H9NH3)2PbI4 has been synthesized through a simple and high-yield solution method. For the first time, this layered perovskite was used as a candidate material for gas sensors. Gas sensors based on (C4H9NH3)2PbI4 provided unique gas-sensing properties toward 1 - 800 ppm p-xylene (p-C8H10) at the working temperature of 140 °C, including fast response, quick response-recovery, good selectivity and repeatability. The as-prepared (C4H9NH3)2PbI4 gas sensor can detect as low as 1 ppm concentration of p-xylene with a response of 11.8 at 140 °C. In situ diffuse reflectance Fourier transform infrared (DRFTIR) measurement shows that the p-xylene sensing mechanism can be mainly attributed to physical adsorption, which is different from other common gas-sensing metal oxides that are based on adsorption-redox-desorption mechanism.
关键词： (C4H9NH3)2PbI4,physisorption,layered perovskite,gas sensor,organic-inorganic,p-xylene
更新于2025-09-10 09:29:36
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Design and analysis of electrostatic-charge plasma based dopingless IGZO vertical nanowire FET for ammonia gas sensing
摘要： In this paper, Dopingless Gate All Around (GAA) Vertical Nanowire Field Effect Transistor (VNWFET) is designed with artificial material Indium Gallium Zinc Oxide (IGZO) as a channel material. IGZO channel has high electron mobility compared to more traditional amorphous semiconductors. In VNWFETs, since the channel length (Lch) is characterized vertically, it can be relaxed without area penalty on-chip, which in turn also allows some relaxation in the nanowire diameter while keeping optimum short-channel-effects control. Electrostatic-Charge Plasma technique is used to form a source-drain region on an intrinsic body of IGZO material. At the source side, the N+ region is formed by selecting the appropriate work function of the metal electrode, and at the drain side, the N+ region is formed by giving biasing to the metal electrode. N+ channel dopingless VNWFET with the catalytic metal gate is proposed for ammonia gas sensing. Cobalt, Molybdenum, and Ruthenium are used as a gate electrode in ammonia gas detection due to their high reactivity towards ammonia. Also, we have compared their ON and OFF sensitivity of the proposed device toward the gas adsorption. Due to the presence of gas on the gate, the metal work function of gate metal changes which varies the OFF-current (IOFF), ON-current (ION) and Threshold voltage (Vth) as these are considered as sensitivity parameters for sensing the ammonia gas molecules. The dimensional parameters (radius, and length) and dielectric materials are varied to check the change in device sensitivities. Results show that as the work function varies increases 50, 100, 150, 200meV and 250meV for catalytic metal at the gate, the sensitivity is increased.
关键词： Vertical nanowire FET (VNWFET),Indium Gallium Zinc Oxide (IGZO),Electrostatic-Charge Plasma (E-CP),Ammonia Gas sensor
更新于2025-09-10 09:29:36
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One-pot synthesis of cubic ZnSnO3/ZnO heterostructure composite and enhanced gas-sensing performance
摘要： In this work, we have successfully prepared cubic ZnSnO3/ZnO heterostructure composite (CZS/ZO) by a one-pot hydrothermal method. This composite easily forms a hollow structure through an alkali etching process while keeping its shape unchanged. The possible growth mechanisms have been studied and the material proves to have excellent gas sensing properties. The response of hollow cubic ZnSnO3/ZnO NPs (HZS/ZO) is up to 101 in 50 ppm triethylamine (TEA) gas at a working temperature of 160 (cid:1)C; the lower limit of detection is 1 ppm. Moreover, the materials exhibit high selectivity and good stability. The role of ZnSnO3/ZnO n-n heterojunction in enhancing gas sensitivity is discussed.
关键词： Heterostructure composite,Triethylamine,Hollow cubic ZnSnO3/ZnO,Gas-sensor
更新于2025-09-10 09:29:36
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DNA-CTMA functionalized GaN surfaces for NO2 gas sensor at room temperature under UV illumination
摘要： Considering the power consumption and safety risks in the presence of combustible gases, sensor operation at room temperature (RT～28 °C) has drawn much interest in recent days. Di?erent strategies have been found to meet the e?ective sensor performance at RT. Here, we report a riveting combination of DNA?CTMA/GaN (DGaN) hybrid structure for high-sensitive NO2 gas sensor at RT. The surface modi?cations are caused by the functional groups of DNA?CTMA interactions with GaN. The XPS studies reveal that the native oxides of GaN surface are binding with the functional groups of DNA?CTMA. The DGaN hybrid structure display higher response to various concentrations (100–10 ppm) of NO2 compared to the pristine GaN ?lm. The e?ect of UV illumination on NO2 gas sensing performance of DGaN is also manifested, and the response of the sensor is enhanced under UV illumination in comparison with those of dark condition. From our observations, the amine groups and the negatively charged hydroxyl groups in DNA?CTMA helps for the higher response of gas sensor by the hybrid structure which makes them a good candidate for high-response NO2 gas sensors at RT.
关键词： DNA-CTMA,UV exposure,GaN,Gas sensor
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - ITO-Nano-Titania Gas Sensors at Adsorption of Ethanol, Acetone and Water Molecules
摘要： The measurements capacitance-voltage characteristics and capacitance kinetics were applied for investigation of physical principle of sensor response in the ITO – nanostructured titanium dioxide heterojunction. The studies were fulfilled for ethanol, acetone and water vapor under various frequencies of probing signal. It was shown that processes of surface states recharging are making the most significant contribution to the total capacitance of the studied heterojunction and playing a major role in forming of sensor response to the molecules of the used analytes.
关键词： titanium dioxide,surface states,adsorption,capacitance-voltage characteristics,capacitance kinetics,gas sensor,electronic traps,hysteresis
更新于2025-09-10 09:29:36
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Dual Fabry–Pérot Interferometric Carbon Monoxide Sensor Based on the PANI/Co3O4 Sensitive Membrane-Coated Fibre Tip
摘要： A novel dual Fabry–Pérot (F-P) interferometric carbon monoxide gas sensor based on polyaniline/Co3O4 (PANI/Co3O4) sensing film coated on the optical fibre end face is proposed and fabricated. Its structure is composed of standard single-mode-fibre (SMF), endlessly photonic crystal fibre (EPCF), and PANI/Co3O4 sensing membrane (PCSM). Therefore, they form three F-P reflectors, the reflector between SMF and EPCF, that between EPCF and PCSM, and interface between PCSM and air. So, the dual F-P interferometer is achieved. The results show that in the range of 0–70 ppm, the interference spectra appear red shift with the increasing carbon monoxide concentration. In addition, the high sensitivity of 21.61 pm/ppm, the excellent linear relationship 2 = 0.98476), and high selectivity for carbon monoxide (R are achieved. The response and recovery time are 35 and 84 s, respectively. The sensor has the advantages of high sensitivity, strong selectivity, low cost, and simple structure and is suitable for sensitive detection of trace carbon monoxide gas.
关键词： Photonic Crystal Fibre,Polyaniline,Dual Fabry–Pérot Interferometer,Co3O4,Gas Sensor,Carbon Monoxide
更新于2025-09-09 09:28:46
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Highly efficient ethanol gas sensor based on hierarchical SnO2/Zn2SnO4 porous spheres
摘要： In this work, hierarchucal porous SnO2/Zn2SnO4 nanospheres were succesfully prepared via a facile one-step hydrothermal method with subsequent calcination process. Scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed in order to investigate the structural and morphological properties of the as-prepared composites. The results showed that the SnO2/Zn2SnO4 composites were cpmposed of many porous nanospheres with a uniform diameter of about 500 nm. Moreover, the as-prepared products were used as sensing material for the fabrication of gas sensor. The sensing performance of the sensor was systematically evaluated, and the sensor exhibited excellent ethanol-sensing property. The optimum operating temperature was 250 oC with a reponse of 30.5 toward 100 ppm ethanol. Also, the sensor showed good selectivity, stability and a low detection limit of 0.5 ppm (response 1.4). The good sensing performance of SnO2/Zn2SnO4 nanospheres can be attibuted to the porous structure as well as the heterojunction formed between SnO2 and ZnSn2O4.
关键词： SnO2/Zn2SnO4,Porous sphere,Hydrothermal method,Ethanol,Gas sensor
更新于2025-09-09 09:28:46
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Highly sensitive gas sensor based on Er-doped SnO2 nanostructures and its temperature dependent selectivity towards hydrogen and ethanol
摘要： In the present work, impact of Er3+ doping on the response and selectivity of SnO2 based gas sensor has been investigated in detail. X-ray diffraction (XRD) results confirmed formation of a tetragonal rutile structure of undoped and erbium doped SnO2 nanoparticles. It has been observed that specific surface area of nanoparticles has increased with increase in dopant concentration. The oxidation states and presence of erbium in SnO2 lattice has been confirmed by X-ray photoelectron spectroscopy (XPS). Photoluminescence (PL) analysis revealed that concentration of oxygen vacancies increases with increase in dopant incorporation. It has been observed that 3% Er-doped SnO2 sensor exhibited enhanced sensor response and temperature dependent selectivity towards ethanol and hydrogen at 240 and 360℃ respectively. The enhanced sensor response of the fabricated sensor has been ascribed to large surface area, enormous oxygen vacancies and elevated surface basicity of doped nanoparticles used. The tunable dual selectivity of 3% doped sensor towards ethanol and hydrogen makes it a perfect candidate for ethanol-hydrogen sensing for ethanol steam reforming systems combined to fuel cells.
关键词： hydrogen,nanoparticles,ethanol,gas sensor,selectivity
更新于2025-09-09 09:28:46