DocumentCode :
3118913
Title :
Characterization of Polymer Nanocomposite Thin Films Using Quartz Resonator Sensor
Author :
Qin, Lifeng ; Cheng, Hongbin ; Wang, Qing-Ming
Author_Institution :
Dept. of Mech. Eng., Pittsburgh Univ., PA
fYear :
2006
fDate :
38869
Firstpage :
328
Lastpage :
333
Abstract :
Thin films, especially polymer materials, as sensitive coating materials are wildly used in acoustic wave sensors for chemical and biological applications, and the responses of sensors commonly are regarded to the result of mass change. However, the mechanical properties of coating materials such as shear modulus also affect sensors in a more complicated way. It is therefore necessary to know the mechanical properties of films for design and analysis of sensors or other devices using the thin films. It is also expected that the measurement of responses of acoustic wave resonators coated with thin film materials would enable the characterization of thin film materials´ properties that are otherwise difficult to probe. In this paper, the input electric impedance of four-layer thickness shear mode (TSM) quartz resonators (electrode/quartz/electrode/thin film coating) was derived using transfer matrix of transmission-line model (TLM). To characterize the shear modulus of carbon nanotube (CNT)-polymer nanocomposites, thin nanocomposite films of multi-wall carbon nanotubes (MWCNTs) in copolymers of poly(vinylidene fluoride) (PVDF-TrFE) were fabricated on TSM quartz resonators with spin coating. The resonator´s parameters were extracted by fitting the theoretical curve to experimental admittance spectrum of the uncoated resonator. Shear moduli of PVDF-TrFE/MWCNTs nanocomposite thin films with MWCNTs 0.5wt%, 1wt% and 2wt% were extracted by fitting the theoretical curve to experimental admittance spectrum of the coated resonator. Both the storage modulus and the loss modulus were found to increase with the content of MWCNTs
Keywords :
carbon nanotubes; crystal resonators; curve fitting; electric admittance measurement; electric impedance measurement; insulating thin films; mechanical variables measurement; nanocomposites; organic insulating materials; polymer blends; polymer films; shear modulus; spin coating; surface acoustic wave resonators; surface acoustic wave sensors; transmission line matrix methods; acoustic wave resonators; acoustic wave sensors; admittance spectrum; carbon nanotube-polymer nanocomposites; coating materials; copolymers; electric impedance; film mechanical properties; four-layer thickness shear mode quartz resonators; loss modulus; mass change; multi-wall carbon nanotubes; poly(vinylidene fluoride); polymer nanocomposite thin films; quartz resonator sensor; shear modulus; spin coating; storage modulus; transfer matrix; transmission-line model; Acoustic materials; Acoustic sensors; Biosensors; Chemical and biological sensors; Coatings; Mechanical sensors; Nanobioscience; Polymer films; Sensor phenomena and characterization; Thin film sensors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
International Frequency Control Symposium and Exposition, 2006 IEEE
Conference_Location :
Miami, FL
Print_ISBN :
1-4244-0074-0
Electronic_ISBN :
1-4244-0074-0
Type :
conf
DOI :
10.1109/FREQ.2006.275407
Filename :
4053785
Link To Document :
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