scholarly journals Surface Acoustic Wave DMMP Gas Sensor with a Porous Graphene/PVDF Molecularly Imprinted Sensing Membrane

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 552
Author(s):  
Sheng Xu ◽  
Rui Zhang ◽  
Junpeng Cui ◽  
Tao Liu ◽  
Xiuli Sui ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Polyvinylidene Fluoride ◽  
Tape Casting ◽  
Pvdf Film ◽  
Step Method ◽  
Molecularly Imprinted ◽  
Porous Graphene ◽  
Concentration Changes ◽  
Sensing Membrane

In this paper, surface acoustic wave (SAW) sensors containing porous graphene/PVDF (polyvinylidene fluoride) molecularly imprinted sensitive membrane for DMMP gas detection were investigated. A 433 MHz ST-cut quartz SAW resonator was used to convert gas concentration changes into frequency shifts by the sensors. The porous graphene/PVDF film was fabricated on the sensor’s surface by using the tape-casting method. DMMP molecules were adsorbed on the porous structure sensing film prepared by the 2-step method to achieve the specific recognition effect. The sensitivity of the sensor could reach −1.407 kHz·ppm−1. The response time and recovery time of the SAW sensor with porous graphene/PVDF sensing membrane were about 4.5 s and 5.8 s at the concentration of 10 ppm, respectively. The sensor has good anti-interference ability to most gases in the air.

scholarly journals Effect of fabrication technique on the crystalline phase and electrical properties of PVDF films

2015 ◽  
Vol 33 (1) ◽  
pp. 157-162 ◽  
Author(s):  
P. K. Mahato ◽  
A. Seal ◽  
S. Garain ◽  
S. Sen
Keyword(s):  
Polyvinylidene Fluoride ◽  
Tape Casting ◽  
Dimethyl Formamide ◽  
Pvdf Film ◽  
X Ray Diffraction ◽  
Β Phase ◽  
Cast Films ◽  
Solvent Cast ◽  
Ft Ir ◽  
Ferroelectric Hysteresis

AbstractThe effect of different fabrication techniques on the formation of electroactive β-phase polyvinylidene fluoride (PVDF) has been investigated. Films with varying concentration of PVDF and solvent - dimethyl formamide (DMF) were synthesized by tape casting and solvent casting techniques. The piezoelectric β-phase as well as non polar β-phase were observed for both the tape cast and solvent cast films from X-ray diffraction (XRD) micrographs and Fourier transform infra-red spectroscopy (FT-IR) spectra. A maximum percentage (80 %) of β-phase was obtained from FT-IR analysis for a solvent cast PVDF film. The surface morphology of the PVDF films was analyzed by FESEM imaging. The dielectric properties as a function of temperature and frequency and the ferroelectric hysteresis loop as a function of voltage were measured. An enhancement in the value of the dielectric constant and polarization was obtained in solvent cast films.

Molecularly imprinted surface acoustic wave sensors: The synergy of electrochemical and gravimetric transductions in chemical recognition processes

2012 ◽  
Vol 73 ◽  
pp. 36-44 ◽  
Author(s):  
Youssef Lattach ◽  
Najla Fourati ◽  
Chouki Zerrouki ◽  
Jean-Marie Fougnion ◽  
Francis Garnier ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Molecularly Imprinted ◽  
Chemical Recognition ◽  
Acoustic Wave Sensors ◽  
Wave Sensors

scholarly journals Surface Acoustic Wave-Based Flexible Piezocomposite Strain Sensor

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1576
Author(s):  
Rishikesh Srinivasaraghavan Govindarajan ◽  
Eduardo Rojas-Nastrucci ◽  
Daewon Kim
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Lead Zirconate Titanate ◽  
Polyvinylidene Fluoride ◽  
Strain Sensor ◽  
Fast Response ◽  
Lead Zirconate ◽  
Saw Sensor ◽  
Sensing Applications ◽  
Wide Range

A surface acoustic wave (SAW), device composed of polymer and ceramic fillers, exhibiting high piezoelectricity and flexibility, has a wide range of sensing applications in the aerospace field. The demand for flexible SAW sensors has been gradually increasing due to their small size, wireless capability, low fabrication cost, and fast response time. This paper discusses the structural, thermal, and electrical properties of the developed sensor, based on different micro- and nano-fillers, such as lead zirconate titanate (PZT), calcium copper titanate (CCTO), and carbon nanotubes (CNTs), along with polyvinylidene fluoride (PVDF) as a polymer matrix. The piezocomposite substrate of the SAW sensor is fabricated using a hot press, while interdigital transducers (IDTs) are deposited through 3D printing. The piezoelectric properties are also enhanced using a non-contact corona poling technique under a high electric field to align the dipoles. Results show that the developed passive strain sensor can measure mechanical strains by examining the frequency shifts of the detected wave signals.

Molecularly Imprinted Polymer Integrated with a Surface Acoustic Wave Technique for Detection of Sulfamethizole

2016 ◽  
Vol 88 (2) ◽  
pp. 1476-1484 ◽  
Author(s):  
Akinrinade George Ayankojo ◽  
Aleksei Tretjakov ◽  
Jekaterina Reut ◽  
Roman Boroznjak ◽  
Andres Öpik ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Molecularly Imprinted Polymer ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Wave Technique

STUDY OF DEFECTS IN a-Ge AND a-GeHxUSING SURFACE ACOUSTIC WAVE TECHNIQUE

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-365-C4-368
Author(s):  
K. L. Bhatia ◽  
M.v. Haumeder ◽  
S. Hunklinger
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Technique
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