[바이오소자개론] Biosensors using the piezoelectric property

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2010.01.29
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소개글

[바이오소자개론] Biosensors using the piezoelectric property에 대한 자료입니다.

Ⅰ. Sensors using piezoelectric
crystals : QCM and SAW
Ⅱ. PZT cantilever
Ⅲ. Biomimetic piezoelectric quartz
sensor for caffeine based on
a molecularly imprinted polymer

본문내용

Piezoelectric crystal, e.g. Quartz and PLZT (Pb, La,
Zr, TiOx) are well known for their sensitivity to
pressure on their crystal surfaces. In addition,
the oscillating frequency of a piezoelectrc crystal
decreases on adsorption of a foreign substance
onto its surface.

The variation of oscillating frequency is
proportional to the mass of foreign
molecules deposited on the crystal surface
and the basic frequency of the
piezoelectric crystal.

Quartz Crystal Microbalance= A poly film-coated piezoelectric quartz crystal sensor
The range of resonance frequency= 10~30 MHz
The detection limit = 10^-12 g for analyte molecules( according to Sauerbrey’s equation )

S A W

Surface Acoustic Wave sensor in which the acoustic wave on the surface of the piezoelectric crystal, launched and received on the same surface of the crystal.

The range of resonance frequency= 200~400 MHz

The detection limit of SAW sensors = 10^-15 g for analyte molecules

f0 = frequency before attaching
f = frequency after attaching
m = mass k = stiffness

E = elastic modulus
ρ = density
b, L = wide, length

fd = damped frequency
fn = undamped frequency
mliquid = added mass of liquid

M = damping coefficient
C = mcantilever + mliquid
ζ = damping ratio

Caffeine↑⇒ Mass on the surface↑⇒ Oscillation frequency↓
⇒ frequency shift↑
MIP Coated crystal is very sensitive to the concentration of caffeine and
shows Very good linearity relationship
Effect of pH on the sensor response is optimum at pH 8 ⇒ Buffer solution

#crystal #frequency

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