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IMM Roma. Mass and Conductivity sensors based on Nanostructured conjugated polymers coating. E. Zampetti , S. Pantalei, A. Macagnano, A. Bearzotti IMM-CNR Rome, Via del fosso del cavaliere 100, 00133 Rome, Italy. Venditti, I. Fratoddi, M. V. Russo

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Mass and Conductivity sensors based on Nanostructured conjugated polymers coating

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Mass and conductivity sensors based on nanostructured conjugated polymers coating

IMM Roma

Mass and Conductivity sensors

based on Nanostructured conjugated polymers coating

E. Zampetti, S. Pantalei, A. Macagnano, A. Bearzotti

IMM-CNR Rome, Via del fosso del cavaliere 100, 00133 Rome, Italy.

Venditti, I. Fratoddi, M. V. Russo

Chemistry Department, University of Rome La Sapienza, p.le Aldo Moro 5, 00185, Rome, Italy

Perugia, 12-15 June 2007

E-mail: [email protected]


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Outline

Transducers

Nanostructured Materials: the active area improvement.

Nanostructured Material Characterizations by

interdigitated and QCM transducers.

Conclusions


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Transducers :

Interdigitated structures

Quartz Crystal Microbalance

30mm

18mm

18mm

30 mm

Two interdigitated sensors (differential measurement)

with integrated heater

Multichannel QCM2

Coated with

Nanostructured Polymer

Characteristics:

Characteristics:

Plate:Quartz

F0:10-40 MHz

Pad:Cr/Au

Ф:8-14 mm

Thickness:60-120 um

Wafer:Si/SiO2

Finger:40

Metal:Cr 100 nm

Dimensions:20μm / 20μm

Length:5600μm

Humidity is an important parameter

in many sensor application fields:

(bio medical, environmental, food)

2 S. Pantalei, E. Zampetti, A. Macagnano et all.

“A Multichannel Quartz Based Electronic Nose”, EUROSENSORS XX,

Vol 2, (2006) 416-417.


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Materials: the active area improvement

POLIFENILACETILENE

(PPA)

CO-POLI(FENILACETILENE/2-IDROSSIETILMETACRILATO)

P(PA/HEMA)

Synthesis1 by Bottom Up approach

Synthesis1 by Bottom Up approach

200 nm

300 nm

PPA (nano-beds)

PPA/HEMA (nano-beds)

1 Sensors and Actuators B, in press (October 2006)

Synthesis of conjugated polymeric nanobeads for photonic bandgap materials

I. Venditti, R. D'Amato, M. V. Russo, M. Falconieri


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Response vs. humidity

Vp=1 V

RH step: 2.5% every 300 s

RH stop: 1000 W/D

Elected coating

P(PA/HEMA)

F0: 20 MHz

Res. ≈ 0.2 ng/Hz

Dep. MPPA= Dep. MassPPA/HEMA

Nitrogen carrier


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Hysteresis and Reproducibility

Interdigitated sensors

need of thickness measurement

(1 and 2 are different)

Interdigitated sensors

are affected by the hysteresis phenomena

more than mass sensors

The interdigitated sensor performance changes

in the whole range (sensitivity, response)

The mass sensor response is affected by other VOCs

“QCM sensor with integrated

interdigitated sensor

may be used”


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Thickness effects

Butterworth Van Dike Model ( I° order)

L: Mass loading

R: Viscosity coefficient

C: Elastic coefficient

No viscoelastic effects due to the coating.

According to Sauerbrey:

Frequency shift vs. thickness

fq: resonant frequency

mf:surface density

ρq: quartz density (act.area S)


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Acoustic Stiffness

Coated: shift 12 KHz

Uncoated

Coated: shift 75 KHz

Coated: shift 35 KHz

Viscoelastic effects


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Adsorption phenomena: thickness effects

t5

RH% Response

t1

t5

t5 >> t1

t1


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Conclusions

Conductivity and Adsorption measurements have been performed.

Acoustic stiffness, Thickness are very important parameters in sensorial application.

Nanostructured PPA and P(PA/HEMA) are excellent chemical

interactive materials for humidity sensors.

Future outlooks

Functionalization of the Nanostructured PPA or P(PA/HEMA)

to increase the VOC sensitivity.

A hybrid (conductivity, mass) sensor based on P(PA/HEMA)

may be used in Artificial Sensorial Systems (Electronic Nose).


Mass and conductivity sensors based on nanostructured conjugated polymers coating

Gli autori

Antonella Macagnano

Iole Venditti

Maria Vittoria Russo

Simone Pantalei

Andrea Bearzotti

Emiliano Zampetti

ringraziano per la cortese attenzione

E-mail: [email protected]


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