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Chin. Phys. B, 2014, Vol. 23(11): 117704    DOI: 10.1088/1674-1056/23/11/117704
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

High sensitivity gravimetric sensor made of unidirectional carbon fiber epoxy composite on (1-x)Pb(Zn1/3Nb2/3)O3- xPbTiO3 single crystal substrate

Huang Nai-Xing (黄乃兴)a b, Lü Tian-Quan (吕天全)a, Zhang Rui (张锐)a, Cao Wen-Wu (曹文武)a c
a Condensed Matter Science and Technology Institute, Department of Physics, Harbin Institute of Technology, Harbin 150080, China;
b Department of Physics, College of Electronic Science, Northeast Petroleum University, Daqing 163318, China;
c Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Abstract  We have derived a general formula for sensitivity optimization of gravimetric sensors and have used it to design a high sensitivity gravimetric sensor using unidirectional carbon fiber epoxy composite (CFEC) waveguide layer on (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-xPT) single crystal substrate with the carbon fibers parallel to the x1 and x2 axes, respectively. The normalized maximum sensitivity (|Smf|λ)max exhibits an increasing tendency with the decrease of (h/λ ight)opt and the maximum sensitivity (|Smf|λ)max increases with the elastic constant c66E of the piezoelectric substrate material. For the CFEC/[011]c poled PZN-7%PT single crystal sensor configuration, with the carbon fibers parallel to the x1 axis at λ = 24 μm, the maximum sensitivity |Smf|max can reach as high as 1156 cm2/g, which is about three times that of a traditional SiO2/ST quartz structure gravimetric sensor. The better design selection is to have the carbon fibers parallel to the direction of propagation of Love wave in order to obtain the best sensitivity.
Keywords:  Love wave      gravimetric sensor      ferroelectric single crystal      sensitivity optimization  
Received:  23 April 2014      Revised:  19 May 2014      Accepted manuscript online: 
PACS:  77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)  
  52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))  
  77.65.Dq (Acoustoelectric effects and surface acoustic waves (SAW) in piezoelectrics)  
  07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)  
Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB632900).
Corresponding Authors:  Lü Tian-Quan, Zhang Rui     E-mail:  ltq@hit.edu.cn;ruizhang_ccmst@hit.edu.cn

Cite this article: 

Huang Nai-Xing (黄乃兴), Lü Tian-Quan (吕天全), Zhang Rui (张锐), Cao Wen-Wu (曹文武) High sensitivity gravimetric sensor made of unidirectional carbon fiber epoxy composite on (1-x)Pb(Zn1/3Nb2/3)O3- xPbTiO3 single crystal substrate 2014 Chin. Phys. B 23 117704

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