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Updated: Jan 19, 2026
Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
Published on: March 24, 2023
High Sensitivity NO₂ Gas Sensor Based on 3D WO₃ Microflowers Assembled by Numerous Nanoplates
Pei-Jiang Cao1, Meng Li1, Ch N Rao1
1Shenzhen Key Laboratory of Special Functional Materials, Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Guangdong Research Center for Interfacial Engineering of Functional Materials, and College of Materials Science and Engineering, Shenzhen University; Shenzhen 518055, China.
Abstract:
Tungsten oxide microflowers (WO₃ MFs) were fabricated by a simple hydrothermal process through adjusting the pH of the solution by HCl. These MFs possess the outer diameters of about 2 μm and are composed of numerous nanoplates with the average pore size of 10.9 nm. Chemiresistive activity of as-fabricated WO₃ MFs sensor was attempted towards oxidizing and reducing target gases, revealing a superior selectivity to NO₂ with a maximum response of 22.95 (2 ppm NO₂) @105 °C compared to other target gases. One of the key features of as-fabricatedWO₃ MFs sensor is the lower detection limit of 125 ppb and operating temperature of 105 °C to NO₂ with better reproducibility, signifying commercial prospective of the developed sensor materials. Finally, the gas sensing mechanism of WO₃ MFs sensor has been proposed.
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