An NO2 sensor based on WO3 thin films for automotive applications in the microwave frequency range

Paleczek, Anna; Grochala, Dominik; Staszek, Kamil; Gruszczyński, Sławomir; Maciak, E.; Opilski, Z.; Kałużyński, Piotr; Wójcikowski, Marek; Cao, Tuan Vu; Rydosz, Artur

doi:10.1016/j.snb.2022.132964

Cited by 12 publications

(5 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2.0% Mo doped WO 3 displayed a high response up to 54.55% towards acetaldehyde gas [2]. In addition WO 3 thin films are employed for automotive applications in the microwave frequency range [3]. New class of sensors has been developed to work in the 1.5-4.5 GHz frequency domain for sensing NO 2 gas in the range of 0-20 ppm [3].…”

Section: Introductionmentioning

confidence: 99%

“…In addition WO 3 thin films are employed for automotive applications in the microwave frequency range [3]. New class of sensors has been developed to work in the 1.5-4.5 GHz frequency domain for sensing NO 2 gas in the range of 0-20 ppm [3]. These sensors were able to work at ambient temperatures with no need for sensor warming [3].…”

Section: Introductionmentioning

confidence: 99%

“…New class of sensors has been developed to work in the 1.5-4.5 GHz frequency domain for sensing NO 2 gas in the range of 0-20 ppm [3]. These sensors were able to work at ambient temperatures with no need for sensor warming [3]. Moreover, WO 3 thin films occupy their position as promising electronic components.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced structural, optical and electrical properties of polycrystalline WO₃ thin films achieved by aluminum nanosheets coating

Qasrawi,

Khanfar

2024

Phys. Scr.

View full text Add to dashboard Cite

Herein the effects of aluminum nanosheets on the structural, morphological, optical and electrical properties of tungsten oxide thin films are reported. Polycrystalline phase of the thermally evaporated WO3 was achieved by the pulsed laser welding technique. The polycrystalline films are then coated with Al nanosheets of thicknesses of 100 nm and 150 nm by the ion coating technique. It is observed that Al induces the domination of the hexagonal structure of WO3 over the tetragonal. Associated with the enhanced crystallinity the light absorption in the films increased by more than 60 % and the energy band gap narrowed significantly. Namely the energy band gap of the as grown WO3 decreased from 3.15 eV to 2.85 eV and 2.59 eV as the Al layer thickness increased from 100 to 150 nm, respectively. It is also observed that crystalline films of WO3 exhibited lower electrical resistivity compared to films fabricated by other techniques. The temperature dependent electrical resistivity measurement was carried out in the temperature range of 310-420 K. It showed room temperature values of 2.5 (Ωcm), 2.2 (Ωcm) and 1.9 (Ωcm) and impurity levels centered at 0.25 eV, 0.34 eV and 0.16 eV for uncoated and films coated with Al nanosheets of thicknesses of 100 nm and 150 nm, respectively. The enhanced crystallinity that is accompanied with narrower energy band gap and lower electrical resistivity values make crystalline WO3 films promising for optoelectronic applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced structural, optical and electrical properties of polycrystalline WO₃ thin films achieved by aluminum nanosheets coating

Qasrawi,

Khanfar

2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…A coplanar sensor working in the microwave frequency range of 1.5−4.5 GHz is designed, and a layer of WO 3 film is coated on the surface to achieve the detection of NO 2 at 0−20 ppm concentration. 4 Wireless measurement of ammonia (NH 3 ) is realized based on RFID technology and carboxyl group-functionalized polypyrrole (C-PPy) nanoparticles (NPs), 5 and the author also tested the stability of the sensor in the condition of bending or deformation to demonstrate its application value in wearable devices. A SnO 2 /bionic porous (BP) carbon composites-based thick film material is prepared, and an ultra-narrowband microwave filter based on microwave transmission technology is designed to verify the sensing performance of ammonia at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The changes in dielectric properties caused by the contact between the gas and material are converted into observable microwave parameters through the microwave sensor to achieve the purpose of gas detection. A coplanar sensor working in the microwave frequency range of 1.5–4.5 GHz is designed, and a layer of WO 3 film is coated on the surface to achieve the detection of NO 2 at 0–20 ppm concentration . Wireless measurement of ammonia (NH 3 ) is realized based on RFID technology and carboxyl group-functionalized polypyrrole (C-PPy) nanoparticles (NPs), and the author also tested the stability of the sensor in the condition of bending or deformation to demonstrate its application value in wearable devices.…”

Section: Introductionmentioning

confidence: 99%

Integrated Passive Device-Based Gas Sensor Combined with PANI/SnO₂ Composites for Ammonia Detection

Tang,

Xu,

Wang

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

This paper investigates the application of microwave-transduction-based sensors in gas detection. An optimized microwave resonator sensor based on integrated passive device (IPD) technology coated with PANI/SnO2 composites that changes its dielectric properties under ammonia (NH3) exposure is developed. PANI/SnO2 is an organic–inorganic composite that exhibits good response and recovery capability to ammonia at room temperature, establishing the foundation for a microwave detection scheme. The performance of the gas sensor under a 10–120 ppm ammonia environment is studied by observing the microwave parameters of the microwave sensor, with the frequency shifts of 0.299 and 0.925 MHz/ppm at low (10–60 ppm) and high (60–120 ppm) concentration levels at room temperature (20 °C) and 40% relative humidity (RH). In addition, a capacitive device based on micro–nano processing technology is fabricated to study the gas sensing mechanism and observe the relationship between PANI/SnO2 composites under different ammonia environments and the variation of dielectric properties.

show abstract

Enhanced Gas Sensing Characteristics of a Polythiophene Gas Sensor Blended with UiO‐66 via Ligand Functionalization

Hong,

Jo,

et al. 2024

Adv Elect Materials

View full text Add to dashboard Cite

Conjugated polymers exhibit significant potential for use in gas sensors owing to their flexibility and straightforward preparation. However, the performance of organic gas sensors based on such materials is currently suboptimal owing to their poor charge‐transport properties and limited selectivity. To address this limitation, a novel strategy that involves blending a chemically modified metal–organic framework (MOF) material, UiO‐66, with a conjugated polymer is developed. The MOF porous material is chemically modified with polar nitrogen‐containing functional groups (amino and nitro groups) to create gas molecule adsorption sites. To evaluate the impact of these modifications on the sensing performance, experiments that combined the sensing performance with a density functional theory simulation are conducted. The findings reveal that gas sensors fabricated using an amine‐functionalized MOF blended with conjugated polymers exhibit significantly higher sensitivity than home polymer devices, the sensing performance of the UiO‐66‐NH2/P3HT blend film improved by a factor of two with a sensitivity of ≈2%/ppm and an LOD of 0.001 ppt. Additionally, these devices exhibit exclusive NO2‐sensing performance for other gases such as CO2 and SO2.

show abstract

An NO2 sensor based on WO3 thin films for automotive applications in the microwave frequency range

Cited by 12 publications

References 92 publications

Enhanced structural, optical and electrical properties of polycrystalline WO₃ thin films achieved by aluminum nanosheets coating

Enhanced structural, optical and electrical properties of polycrystalline WO₃ thin films achieved by aluminum nanosheets coating

Integrated Passive Device-Based Gas Sensor Combined with PANI/SnO₂ Composites for Ammonia Detection

Enhanced Gas Sensing Characteristics of a Polythiophene Gas Sensor Blended with UiO‐66 via Ligand Functionalization

Contact Info

Product

Resources

About

An NO2 sensor based on WO3 thin films for automotive applications in the microwave frequency range

Cited by 12 publications

References 92 publications

Enhanced structural, optical and electrical properties of polycrystalline WO3 thin films achieved by aluminum nanosheets coating

Enhanced structural, optical and electrical properties of polycrystalline WO3 thin films achieved by aluminum nanosheets coating

Integrated Passive Device-Based Gas Sensor Combined with PANI/SnO2 Composites for Ammonia Detection

Enhanced Gas Sensing Characteristics of a Polythiophene Gas Sensor Blended with UiO‐66 via Ligand Functionalization

Contact Info

Product

Resources

About

Enhanced structural, optical and electrical properties of polycrystalline WO₃ thin films achieved by aluminum nanosheets coating

Enhanced structural, optical and electrical properties of polycrystalline WO₃ thin films achieved by aluminum nanosheets coating

Integrated Passive Device-Based Gas Sensor Combined with PANI/SnO₂ Composites for Ammonia Detection