- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
H2 gas sensor based on PdOx-doped In2O3 nanoparticles synthesized by flame spray pyrolysis
摘要： In this work, 0–1.0 wt% PdOx-doped In2O3 nanoparticles were successfully synthesized by flame spray pyrolysis (FSP) in a single step for the first time and investigated for gas-sensing applications. The sensing films were fabricated by spin coating and tested towards hydrogen (H2) at various temperatures ranging from 150 to 350 °C in dry air. The powder and sensing film properties were analyzed by X-ray analyses, nitrogen adsorption and electron microscopy. The spherical and cubic In2O3 nanoparticles with diameters ranging from 2 to 20 nm were observed with no apparent secondary phase of Pd or PdOx. Detailed analyses suggested that Pd species might be in the form of PdOx crystallites embedded in and on grain boundaries of In2O3 nanoparticles. From gas-sensing measurements, hydrogen-sensing characteristics of In2O3 nanoparticles were significantly improved by PdOx doping particularly at the optimal Pd content of 0.50 wt%. The optimal PdOx-doped In2O3 sensing film showed a high response of 3526 towards 10,000 ppm H2 at the optimal working temperature of 250 °C. In addition, PdOx doped In2O3 sensing films displayed good stability and high H2 selectivity against various toxic and flammable gases including H2S, NO2, C2H4O, C2H4, C2H5OH and C2H2.
关键词： Flame spray pyrolysis,PdOx doped In2O3,H2 sensor,Semiconducting metal oxide
更新于2025-09-23 15:22:29
-
Improved Sensing Capability of Integrated Semiconducting Metal Oxide Gas Sensor Devices
摘要： Semiconducting metal oxide (SMO) gas sensors were designed, fabricated, and characterized in terms of their sensing capability and the thermo-mechanical behavior of the micro-hotplate. The sensors demonstrate high sensitivity at low concentrations of volatile organic compounds (VOCs) at a low power consumption of 10.5 mW. In addition, the sensors realize fast response and recovery times of 20 s and 2.3 min, respectively. To further improve the baseline stability and sensing response characteristics at low power consumption, a novel sensor is conceived of and proposed. Tantalum aluminum (TaAl) is used as a microheater, whereas Pt-doped SnO2 is used as a thin film sensing layer. Both layers were deposited on top of a porous silicon nitride membrane. In this paper, two designs are characterized by simulations and experimental measurements, and the results are comparatively reported. Simultaneously, the impact of a heat pulsing mode and rubber smartphone cases on the sensing performance of the gas sensor are highlighted.
关键词： electro-thermal-mechanical simulation,semiconducting metal oxide,ultra-low power,gas sensor,smartphone,microheater
更新于2025-09-19 17:15:36
-
Porosity Controlled 3D SnO2 Spheres via Electrostatic Spray: Selective Acetone Sensors
摘要： Tailoring of semiconducting metal oxides (SMOs) nanostructures with high porosity is of importance for enhanced gas sensing performance. Hierarchically-assembled SMOs possess high surface area but often suffer from low porosity. Here, bimodal pore-loaded hierarchical SnO2 (PH-SnO2) spheres were successfully synthesized via electrostatic spraying method (e-spraying) combined with colloidal templating route using polystyrene beads. The resulting porous PH-SnO2 spheres were used as sensing layers for detection of acetone, which exhibited improve the sensing performance. As a result, the Pt-functionalized PH-SnO2 (Pt-PH-SnO2) spheres showed dramatically improved acetone detection capability with a response (Rair/Rgas) about 20% enhanced response compared with hierarchical SnO2 (H-SnO2) spheres without through a simple dispersion of catalytic nanoparticle (NPs) in the e-spraying solution to pores. In addition, e-spraying is a fascinating technique for uniform catalytic functionalization selectivity. In this work, the unique combination of e-spraying and PS templating route paves of 44.83 at 5 ppm as compared to PH-SnO2 spheres (Rair/Rgas = 6.61) as well as superior the way for robust and facile synthetic method for bimodal pore loaded 3D hierarchical SMOs, and demonstrates the feasibility for application in exhaled breath sensors.
关键词： Semiconducting metal oxide,Bimodal pores,Electrostatic spraying,PS template,Pattern recognition,Chemical sensors
更新于2025-09-12 10:27:22
-
Ammonia Sensing Characteristics of a Tungsten Trioxide Thin-Film-Based Sensor
摘要： A tungsten trioxide (WO3) thin-film-based ammonia sensor device prepared using radio frequency sputtering is reported and studied. A very thin WO3 film (~10 nm) is employed in the studied device. Experimentally, the studied device exhibits a high ammonia sensing response of 13.7 (at 1000-ppm NH3/air, 250 °C), an extremely low detection level (≤10-ppb NH3/air, 250 °C), a relatively low optimal operating temperature of 250 °C, and a widespread sensing concentration range. Furthermore, the device shows advantages including a simple structure, easy fabrication, and relatively lower operating temperature (≤250 °C). Thus, the proposed WO3 thin-film-based sensor device is promising for high-performance ammonia sensing applications.
关键词： Ammonia,detection level,semiconducting metal oxide (SMO),sensing response,tungsten trioxide (WO3),sputtering
更新于2025-09-09 09:28:46
-
Enhanced Sensing Performance of Integrated Gas Sensor Devices
摘要： Semiconducting metal oxide (SMO) gas sensors, dedicated to wearable devices were designed, fabricated, and characterized in terms of power consumption, thermal distribution, and sensing capability. The sensors demonstrate a sensitivity down to ppb-level VOC concentrations at a low power consumption of 10.5 mW. To further enhance the baseline stability and sensing response characteristics at low power consumption, a new sensor structure is proposed. The design implements novel aspects in terms of fabrication and microheater geometry, leading to improved sensor performance which enables new applications for SMO gas sensors. In this work, two designs were analyzed using experimental characterization and simulation. The results of the analyses of the two sensors are comparatively reported.
关键词： microheater,electo-thermal simulation,gas sensor,semiconducting metal oxide
更新于2025-09-04 15:30:14