Development of a highly sensitive and portable particulate matter SAW sensor and interface electronics

Development of Highly Stable and Sensitive SAW UV Sensor Based on Ta2O5 Coated 1D ZnO/SnO2 Core–Shell Nanostructures

“…The detailed process of COM modeling has been reported in our previous papers. [24][25][26] Figure 2 shows the simulated results of the COM modeling using the determined structural parameters of two-port SAW delay line. The determined structure provided a small loss of ≈8.2 dB at the center frequency of 284 MHz and a large side lobe of −46.5 dB.…”

Trends and Applications of Surface and Bulk Acoustic Wave Devices: A Review

“…Since then, by depositing different sensitive layers, SAW device-based gas sensors have been developed for detection of H 2 [ 86 ], H 2 S [ 87 , 88 ], NO 2 [ 89 , 90 ], CO 2 [ 89 ], CH 4 [ 91 ], SO 2 [ 92 ], NH 3 [ 93 ], O 3 [ 94 ], O 2 [ 95 ], CO [ 96 ], volatile organic compounds (VOCs) [ 97 , 98 , 99 ], explosives [ 100 , 101 ], etc. In 2022, Singh et al [ 102 ] reported a SAW-based particulate matter (PM2.5) sensor which is wearable and shows a high detection sensitivity. Another important advantage of SAW device-based sensors is that they are passive components with the potential to be interrogated wirelessly.…”

System Integration of an Optimally Designed Virtual Impactor with a QCM Sensor as a One-Stop PM2.5 Classification and Detection Platform

“…However, as this method does not directly provide the mass concentration of PM, accurate measurement is impossible. Moreover, the measurement accuracy is easily affected by the PM size, composition, and humidity of the ambient air. , The TEOM method can realize precise measurement of PM mass concentration, but it is generally bulky and expensive and takes a long time for measurement. − The β-attenuation method is used for PM mass measurement based on a correlation between the intensity of the β radiation and the deposited PM mass on a filter. − This method can provide accurate measurements but is subject to interference error and influenced by the dust composition, particle size distribution, and density . In addition, as it uses a radiometric source to emit β particles, it is expensive and bulky.…”

“…Airborne particulate matter has attracted significant attention due to its adverse effects on humans and the environment. − The toxicity of PM depends mostly on its size and composition, such as chemical or trace element content, acid and sulfate content, etc. − The PM size is often of major importance. PM pollution, especially PM 2.5 particles, which have an aerodynamic diameter smaller than or equal to 2.5 μm (called fine particles), poses a serious threat to human health, as they can penetrate the human respiratory system and cause alveolar inflammation or cardiovascular and cerebrovascular diseases. − Besides, PM 2.5 particles can transport bacteria, fungi, and heavy metals, increasing the possibility of instigating and transmitting diseases. − Except for health risks, these fine particles can affect the earth’s radiative balance by scattering and absorbing solar radiation and causing reduced visibility. , Therefore, from the point of view of protecting the environment and human health, it is particularly important to monitor the PM 2.5 concentration.…”

“…Various methods have been developed for the detection of PM concentration, including the gravimetric method, light scattering method, tapered element oscillating microbalance (TEOM) method, β-attenuation method, acoustic sensing method, and so on. ,− The gravimetric method consists of selecting particles by inertial separation, followed by filtration and gravimetric analysis of collected particles on the filter. , This method has the advantages of a simple measuring principle, reliable data, and freedom from the interference of particle characteristics. However, it requires a long time for sampling, and the PM mass is hard to detect in real time.…”