Novel scheme to improve SnO2/SAW sensor performance for NO2 gas by detuning the sensor oscillator frequency

Raj, V. Bhasker; Nimal, A.T.; Tomar, Monika; Sharma, M.U.; Gupta, Vinay

doi:10.1016/j.snb.2015.05.043

Cited by 34 publications

(18 citation statements)

References 25 publications

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“…Therefore, we believe that the changes in elasticity are the dominant sensing mechanism for Pb(NO3)2-treated PbS/SAW gas sensor. The increase in elasticity of the sensing film due to the entrapment of target gas molecules in pores at grain boundaries was also reported by other researchers [40,41].…”

Section: Resultssupporting

confidence: 77%

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Kan

Chen

et al. 2019

Sensors and Actuators B: Chemical

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Section: Resultssupporting

confidence: 77%

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Kan

Chen

et al. 2019

Sensors and Actuators B: Chemical

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“…Table 4 shows some of the SAW NO x sensors reported in the literature. (36)(37)(38) Compared with other SAW sensors in early works, the frequency response in the present work is significant towards 20 ppb NO concentration. Hence, the present EWC/SPUDT SAW sensor coated with a Cu 2+ /PANI/WO 3 layer is able to sensitively detect NO gas concentrations of the order of partsper-billion at room temperature.…”

Section: Saw Sensormentioning

confidence: 72%

Enhanced Sensitive Surface Acoustic Wave Device Designed for Nitric Oxide Gas Detection

Chung¹,

Hwang²,

Chiu³

et al. 2019

Sensors and Materials

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Surface acoustic wave (SAW) devices equipped with an electrode-width-controlled (EWC)/ single-phase unidirectional transducer (SPUDT) and fabricated on ST-X quartz were proposed and found to have low insertion loss and single-mode capability. The devices were then used to determine parts-per-billion levels of nitric oxide (NO). A new modified equivalent circuit (EC) model was used to model and analyze the characteristics of SAW devices prior to their fabrication. The small-signal frequency responses (S 21) obtained by simulation and measurement were consistent. A feedback-loop oscillator was used to design SAW-resonatorstabilized oscillators that provided stable oscillation. A SAW oscillator with an EWC/SPUDT structure was used to provide fundamental signals with high output power, induce high harmonic suppression, and realize long-term frequency stability. SAW devices with an EWC/ SPUDT structure were coated with a Cu 2+ /PANI/WO 3-sensitive layer to successfully determine parts-per-billion levels of NO. For a NO concentration of 50 ppb in dry air, the frequency shift in the SAW sensor with the EWC/SPUDT structure is 502 Hz. Moreover, the response and recovery time are 40 and 112 s, respectively. The sensitivity of NO detection for a concentration range of 20-80 ppb is approximately 4.2 Hz/ppb (~3.43 kHz/mg/m 3).

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“…The main factors that change the frequency of SAW gas sensors are mass loading, acoustoelectric effect (electrical loading) and elastic loading, which can be expressed using the following equation [17] :…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…Metal oxides are the most commonly investigated materials for the SAW sensing layer [12]. Various metal oxide semiconductors such as ZnO [5,7,8,13,14], SnO 2 [15][16][17], WO 3 [18][19][20], TiO 2 [3,[21][22][23], CuO [24][25][26] have been successfully applied as the gas sensing layers on the SAW devices. Metal sulfides are rarely reported being used in gas sensors compared to those widely reported metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave ammonia sensor based on ZnS mucosal-like nanostructures

Long

Guo

et al. 2020

Microelectronic Engineering

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Novel scheme to improve SnO2/SAW sensor performance for NO2 gas by detuning the sensor oscillator frequency

Cited by 34 publications

References 25 publications

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Colloidal quantum dot-based surface acoustic wave sensors for NO2-sensing behavior

Enhanced Sensitive Surface Acoustic Wave Device Designed for Nitric Oxide Gas Detection

Surface acoustic wave ammonia sensor based on ZnS mucosal-like nanostructures

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