scholarly journals Characteristics of Surface Acoustic Wave Sensors with Nanoparticles Embedded in Polymer Sensitive Layers for VOC Detection

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2401 ◽  
Author(s):  
Cristian Viespe ◽  
Dana Miu
Keyword(s):  
Acoustic Wave ◽  
Response Time ◽  
Frequency Shift ◽  
Surface Acoustic Wave ◽  
Limit Of Detection ◽  
Saw Sensor ◽  
Acoustic Wave Sensors ◽  
Volatile Organic ◽  
Wave Sensors ◽  
Better Than

Surface Acoustic Wave (SAW) sensors with several types of polymer sensing films, containing embedded Fe3O4 nanoparticles (NPs) with various dimensions and concentrations, were studied. A sensor with a sensing film consisting of the polymer alone was used for comparison. NPs with a mean diameter of 7 nm were produced by laser ablation with 5 ns pulse durations, and NPs with 13 nm diameters were obtained with a laser having 10 ps pulse durations. The properties of the Surface Acoustic Wave sensors with such sensing films were analyzed. Their response (frequency shift, sensitivity, noise and response time) to three different volatile organic components (VOCs) at various concentrations were compared with one another. The frequency shift and sensitivity increased with increasing NP concentration in the polymer for a given NP dimension and with decreasing NP diameter for a given concentration. The best results were obtained for the smallest NPs used. The SAW sensor containing 7 nm NPs had a limit of detection (LOD) of 65 ppm (almost five times better than the sensor with polymer alone), and a response time of about 9 s for ethanol.

scholarly journals Design of Surface Acoustic Wave Sensors Functionalized with Bisphenol S Based Molecules for Lead Ions Detection

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 872 ◽  
Author(s):  
Ghada Attia ◽  
Zineb Khaldi ◽  
Seyfeddine Rahali ◽  
Najla Fourati ◽  
Chouki Zerrouki ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Density Functional ◽  
Limit Of Detection ◽  
Lead Ions ◽  
Bisphenol S ◽  
Functional Theory ◽  
Saw Sensor ◽  
Acoustic Wave Sensors ◽  
Wave Sensors

This study concerns the design of surface acoustic wave sensors functionalized with bisphenol S based molecules for lead ions detection. (4-hydroxyphenyl, 4′-benzyloxyphenyl) sulfone (M1), (4-hydroxyphenyl,4′-anthrylmethyloxyphenyl) sulfone (M2) and (4,4′-bis (anthrylmethyloxyphenyl)) sulfone (M3) were synthesized and then drop-coated on the SAWs sensing areas. Gravimetric results indicate that the limit of detection of the three sensors is in the picomolar range and that the M3/SAW sensor has the highest affinity towards lead ions compared to M1/SAW and M2/SAW. Density functional theory (DFT) calculations were investigated to support experimental results and to understand the nature of interactions involved between lead ions and the three synthetized molecules.

Detection of volatile organic compounds using surface acoustic wave sensors with different polymer coatings

2004 ◽  
Vol 467 (1-2) ◽  
pp. 234-238 ◽  
Author(s):  
M.C. Horrillo ◽  
M.J. Fernández ◽  
J.L. Fontecha ◽  
I. Sayago ◽  
M. Garcı́a ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Organic Compounds ◽  
Polymer Coatings ◽  
Acoustic Wave Sensors ◽  
Volatile Organic ◽  
Wave Sensors

scholarly journals Love Wave Surface Acoustic Wave Sensor with Laser-Deposited Nanoporous Gold Sensitive Layer

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4492 ◽  
Author(s):  
Viespe ◽  
Dinca ◽  
Popescu-Pelin ◽  
Miu
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Love Wave ◽  
Limit Of Detection ◽  
Wave Surface ◽  
Sensitivity Limit ◽  
Sensitive Layer ◽  
Acoustic Wave Sensors ◽  
Acoustic Wave Sensor ◽  
Wave Sensors

Laser-deposited gold immobilization layers with different porosities were incorporated into Love Wave Surface Acoustic Wave sensors (LW-SAWs). Acetylcholinesterase (AChE) enzyme was immobilized onto three gold interfaces with different morphologies, and the sensor response to chloroform was measured. The response of the sensors to various chloroform concentrations indicates that their sensing properties (sensitivity, limit of detection) are considerably improved when the gold layers are porous, in comparison to a conventional dense gold layer. The results obtained can be used to improve properties of SAW-based biosensors by controlling the nanostructure of the gold immobilization layer, in combination with other enzymes and proteins, since the design of the present sensor is the same as that for a Love Wave biosensor.

Aluminum Nitride Thin Film Based Surface Acoustic Wave Sensors

2008 ◽  
Author(s):  
A. Kabulski ◽  
V. R. Pagán ◽  
D. Cortes ◽  
R. Burda ◽  
O. M. Mukdadi ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Wave ◽  
Aluminum Nitride ◽  
Surface Acoustic Wave ◽  
Acoustic Wave Sensors ◽  
Wave Sensors

scholarly journals Surface Acoustic Wave Biosensor with Laser-Deposited Gold Layer Having Controlled Porosity

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 173
Author(s):  
Dana Miu ◽  
Izabela Constantinoiu ◽  
Valentina Dinca ◽  
Cristian Viespe
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Gold Film ◽  
Good Control ◽  
Gold Layer ◽  
Porous Gold ◽  
Deposition Parameters ◽  
Acoustic Wave Sensors ◽  
Controlled Porosity ◽  
Wave Sensors

Laser-deposited gold immobilization layers having different porosities were incorporated into love wave surface acoustic wave sensors (LW-SAWs). Variation of pulsed laser deposition parameters allows good control of the gold film morphology. Biosensors with various gold film porosities were tested using the biotin–avidin reaction. Control of the Au layer morphology is important since the biotin and avidin layer morphologies closely follow that of the gold. The response of the sensors to biotin/avidin, which is a good indicator of biosensor performance, is improved when the gold layer has increased porosity. Given the sizes of the proteins, the laser-deposited porous gold interfaces have optimal pore dimensions to ensure protein stability.

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