scholarly journals Bulk Acoustic Wave Characteristics of Pseudo Lateral-Field-Excitation on LGT Single Crystal for Liquid Phase Sensing

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1076 ◽  
Author(s):  
Jiachao Xu ◽  
Tingfeng Ma ◽  
Liang Yan ◽  
Mingfei Wang ◽  
Ji Wang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Acoustic Wave ◽  
High Performance ◽  
Bulk Acoustic Wave ◽  
Shear Mode ◽  
Crystallographic Axis ◽  
Lateral Field ◽  
Wave Characteristics ◽  
Field Excitation ◽  
The One

In the present study, pseudo lateral-field-excitation (LFE) bulk acoustic wave characteristics on LGT crystals are investigated to increase the sensitivity of LFE devices on the liquid characteristic variations. The cut orientation of LGT crystals for pseudo-LFE is investigated and verified experimentally. For an LFE device in the pseudo-LFE mode, the thickness shear mode wave is excited by the thickness field rather than the lateral field. The present work shows that when the (yxl) 13.8° LGT plate is excited by the electric field parallel to the crystallographic axis x, it operates in the pseudo-LFE mode. Moreover, characteristics of devices including the sensitivity and impedance are investigated. The present work shows that sensitivity of LFE devices to variation of the conductivity and permittivity of the aqueous solution are 9 and 3.2 times higher than those for AT-cut quartz crystal based devices, respectively. Furthermore, it has been found that the sensitivity of the LGT LFE sensor to liquid acoustic viscosity variations is 1.4 times higher than the one for the AT-cut quartz sensor. The results are a critical basis of designing high-performance liquid phase sensors by using pseudo-LFE devices.

Double-mode lateral-field-excitation bulk acoustic wave characteristics of Ca3TaGa3Si2O14crystals

2017 ◽  
Vol 142 (2) ◽  
pp. 641-645 ◽  
Author(s):  
Tingfeng Ma ◽  
Qiong Zhang ◽  
Fapeng Yu ◽  
Chao Xie ◽  
Ji Wang ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Bulk Acoustic Wave ◽  
Lateral Field ◽  
Wave Characteristics ◽  
Field Excitation

scholarly journals Regenerable ZnO/GaAs Bulk Acoustic Wave Biosensor for Detection of Escherichia coli in “Complex” Biological Medium

Biosensors ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 145
Author(s):  
Juliana Chawich ◽  
Walid M. Hassen ◽  
Céline Elie-Caille ◽  
Thérèse Leblois ◽  
Jan J. Dubowski
Keyword(s):  
Escherichia Coli ◽  
Acoustic Wave ◽  
Limit Of Detection ◽  
Bulk Acoustic Wave ◽  
Back Surface ◽  
Label Free ◽  
Lateral Field ◽  
E Coli ◽  
Assembled Monolayers ◽  
Field Excitation

A regenerable bulk acoustic wave (BAW) biosensor is developed for the rapid, label-free and selective detection of Escherichia coli in liquid media. The geometry of the biosensor consists of a GaAs membrane coated with a thin film of piezoelectric ZnO on its top surface. A pair of electrodes deposited on the ZnO film allows the generation of BAWs by lateral field excitation. The back surface of the membrane is functionalized with alkanethiol self-assembled monolayers and antibodies against E. coli. The antibody immobilization was investigated as a function of the concentration of antibody suspensions, their pH and incubation time, designed to optimize the immunocapture of bacteria. The performance of the biosensor was evaluated by detection tests in different environments for bacterial suspensions ranging between 103 and 108 CFU/mL. A linear dependence between the frequency response and the logarithm of E. coli concentration was observed for suspensions ranging between 103 and 107 CFU/mL, with the limit of detection of the biosensor estimated at 103 CFU/mL. The 5-fold regeneration and excellent selectivity towards E. coli detected at 104 CFU/mL in a suspension tinted with Bacillus subtilis at 106 CFU/mL illustrate the biosensor potential for the attractive operation in complex biological media.

Investigation of Pure-Lateral-Field-Excitation Bulk Acoustic Wave Sensor with Different Electrodes on (yxl)89° LiNbO3 Single Crystal

2013 ◽  
Vol 791-793 ◽  
pp. 545-549
Author(s):  
Jia Lin Jiang ◽  
Ting Feng Ma
Keyword(s):  
Acoustic Wave ◽  
Electric Field ◽  
Single Crystal ◽  
Bulk Acoustic Wave ◽  
Lateral Field ◽  
Electric Field Direction ◽  
Acoustic Wave Sensors ◽  
Field Excitation ◽  
Wave Sensors ◽  
Piezoelectric Substrate

Lateral field excitation (LFE) acoustic wave devices, which employ two electrodes on the same surface of a piezoelectric substrate, have been found attractive in sensing applications. However, up to now, the sensitivities of pure-LFE devices based on LiNbO3 single crystal is unknown. In this work, the effective LFE exciting electric field direction of (yxl)89° LiNbO3 is determined. The calculated results showed that when the driving electric field direction is perpendicular to the crystallographic X-axis of the piezoelectric substrate, (yxl)89° LiNbO3 LFE device works on pure-LFE mode. Based on this, several LiNbO3 pure-LFE bulk acoustic wave sensors with three different electrodes are designed and fabricated. The results show that the (yxl)89° LiNbO3 LFE sensor with interdigital electrodes is 11.1 times and 2.2 times more sensitive to changes in liquid conductivity compared to traditional LFE devices with single gap circular electrodes and Archimedes spiral electrodes, respectively. The results are important for investigating high-sensitivity LFE bulk acoustic wave sensors by using LiNbO3 single crystal.

Shear mode bulk acoustic wave resonator based on c-axis oriented AlN thin film

2008 ◽  
Vol 104 (8) ◽  
pp. 084508 ◽  
Author(s):  
Evgeny Milyutin ◽  
Sandrine Gentil ◽  
Paul Muralt
Keyword(s):  
Thin Film ◽  
Acoustic Wave ◽  
Bulk Acoustic Wave ◽  
Shear Mode ◽  
Bulk Acoustic Wave Resonator ◽  
Wave Resonator
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