Table 6.
Device type | Piezoelectric material | Device frequency (GHz) | Sensing material | Targeted gas | LOD (ppm) | Frequency shift (Hz/ppm) | Response time (S) | Recovery time (S) | Temp | Year | Refs |
---|---|---|---|---|---|---|---|---|---|---|---|
QCM | AT-CUT | 0.005 | Polymer/GNR | NH | 70 | 106 | 1800 | n/g | RT | 2021 | [169] |
QCM | AT-CUT | 0.009 | ZIF | CO | n/g | n/g | n/g | n/g | RT | 2018 | [333] |
QCM | AT-CUT | 0.009 | (ZIF-8) | CO | 10,00,000 | 217 | 10 | n/g | RT | 2018 | [215] |
QCM | AT-CUT | 0.01 | rGO | CO | 50–500 | 50 | 26 | 10 | RT | 2021 | [176] |
QCM | AT-CUT | 0.01 | MOF | CO | 400–500 | n/g | n/g | n/g | RT | 2018 | [179] |
QCM | AT-CUT | 0.025 | PAAM/MWCNTs | Formaldehyde | 0.5 | 3 | 80 | 100 | RT | 2021 | [331] |
SAW | ST-cut quartz | 0.2 | SiO, TiO | NO | 16 | 112 KHz/40ppm | 80 | 50 | RT | 2017 | [218] |
SAW | ST-cut quartz | 0.4341 | Nickel–Graphene | CO | 200 | 2.07 | – | – | RT | 2015 | [336] |
SAW | ST-cut quartz | 0.2 | GO Nanofilm | CH | 500 | 620 Hz/500ppb | 100 | 500 | RT | 2019 | [338] |
SAW | ST-cut quartz | 0.2 | Boehmite. | NH | 10 | 1540 Hz/10ppm | n/g | n/g | RT | 2019 | [341] |
SAW | Y-Z LiNbO | 0.436 | ZIF-8 | CO | 0.38 | 1.396 rad | n/g | n/g | RT | 2018 | [215] |
SAW | Y-Z LiNbO | 0.86 | ZIF-8 | CO | 0.91 | 1.11 rad | n/g | n/g | RT | 2020 | [216] |
FBAR | ZnO | 0.8 | Ethyl cellulose | CO | 50 ppm | n/g | n/g | n/g | RT | 2017 | [306] |
FBAR | AIN | 2.4 | MOFs | VOCs | 1 ppm | 0.28–1.27 KHz/ppm | n/g | n/g | RT | 2020 | [303, 304] |
FBAR | AIN | 2.45 | Hybrid thin film | VOCs | 40–180 ppb | 0.05 KHz/ppm | n/g | n/g | RT | 2019 | [302] |
FBAR | ZnO | 3.1 | MWCNT -hybrid | Formaldehyde | 50–400 ppb | 1.4-2.13 KHz/ppb | – | - | RT | 2018 | [301] |
FBAR | AIN | 4.4 | polyethyleneimine nanofibers | Formaldehyde | 37 | 1.216 KHz/ppb | 25 | 60 | RT | 2018 | [297] |
FBAR | AIN | 4.8 | “Polyethyleneimine /CNT” | Formaldehyde | 24–38 ppb | 1.29-1.9 KHz/ppb | 57 | 59 | RT | 2018 | [298] |
n/g = not given