The interference of humidity on a shear horizontal surface acoustic wave ammonia sensor

2007 ◽  
Vol 122 (2) ◽  
pp. 457-460 ◽  
Author(s):  
Chi-Yen Shen ◽  
Cheng-Liang Hsu ◽  
Rey-Chue Hwang ◽  
Jin-Shing Jeng
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Horizontal Surface ◽  
Ammonia Sensor ◽  
Shear Horizontal

scholarly journals Evaluation of Shear Horizontal Surface Acoustic Wave Biosensors Using “Layer Parameter” Obtained from Sensor Responses during Immunoreaction

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4924
Author(s):  
Koji Kano ◽  
Hiromi Yatsuda ◽  
Jun Kondoh
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Horizontal Surface ◽  
Propagation Characteristics ◽  
Viscosity Change ◽  
Layer Parameter ◽  
Antibody Reaction ◽  
Antigen Antibody ◽  
Shear Horizontal ◽  
Molecular Dimensions

Shear horizontal surface acoustic wave (SH-SAW) biosensors measure the reaction of capture antibodies immobilized on the sensing surface to capture test molecules (antigens) by using the change in SH-SAW propagation characteristics. SH-SAW displacement exists not only on the SH-SAW propagating surface, but also partially penetrates the specimen liquid to a certain depth, which is determined by the liquid properties of the specimen and the operating frequency of the SH-SAW. This phenomenon is called viscosity penetration. In previous studies, the effect of viscosity penetration was not considered in the measurement of SH-SAW biosensors, and the mass or viscosity change caused by the specific binding of capture antibodies to the target antigen was mainly used for the measurement. However, by considering the effect of viscosity penetration, it was found that the antigen–antibody reaction could be measured and the detection characteristics of the biosensor could be improved. Therefore, this study aims to evaluate the detection properties of SH-SAW biosensors in the surface height direction by investigating the relationship between molecular dimensions and SH-SAW propagation characteristics, which are pseudo-changed by varying the diameter of gold nanoparticles. For the evaluation, we introduced a layer parameter defined by the ratio of the SH-SAW amplitude change to the SH-SAW velocity change caused by the antigen–antibody reaction. We found a correlation between the layer parameter and pseudo-varied molecular dimensions. The results suggest that SH-SAW does not only measure the mass and viscosity but can also measure the size of the molecule to be detected. This shows that SH-SAW biosensors can be used for advanced functionality.

Shear horizontal surface acoustic wave induced microfluidic flow

2011 ◽  
Vol 99 (15) ◽  
pp. 153704 ◽  
Author(s):  
D. S. Brodie ◽  
Y. Q. Fu ◽  
Y. Li ◽  
M. Alghane ◽  
R. L. Reuben ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Horizontal Surface ◽  
Microfluidic Flow ◽  
Wave Induced ◽  
Shear Horizontal
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