Intrinsically conductive polymer thin film piezoresistors

Lillemose, Michael; Spieser, Martin; Christiansen, Nikolaj Ormstrup; Christensen, Anders Lyhne; Boisen, Anja

doi:10.1016/j.mee.2007.12.020

Cited by 27 publications

(20 citation statements)

References 7 publications

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“…Although polyaniline has large potential as a future material in next-generation electronic devices, the low electrical conductivity and stability of polyaniline, as well as its solubility have limited its applications [16] Despite the interest of polyaniline for applications in the area of sensors [17,18] there are not enough data and investigations on the piezoresistive properties of this polymer. Just a work [19] reporting a negative GF near 5 in 4-point bending experiments is found in the literature. The negative GF is justified by an increase of the conductivity for large deformations due to the alignment of the polymer chains [20].…”

Section: Introductionmentioning

confidence: 99%

“…al. [19] reported the measurement of the gauge factor of polyaniline in 4-point and 2-point bending tests, attaining GF0-4.9 and GF0-2.1 respectively. The justification for these values is based on the work of R. P. McCall et.…”

Section: Introductionmentioning

confidence: 99%

“…The increase in conductivity, due to the alignment of the polymeric chains should result in a negative GF. In [19] the applied deformations were on the order of 0.5%, too low to induce the required large polymer chain alignments.…”

Section: Introductionmentioning

confidence: 99%

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Piezoresistive effect in spin-coated polyaniline thin films

et al. 2012

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Polymeric materials have been replacing other materials in various applications, from structural to electronic components. In particular, since the discovery of conducting polymers, the use of these materials is growing up in the manufacture of electronic components, such as organic lightemitting diodes, organic electrodes, energy storage devices and artificial muscles, among others. On the other hand, examples of sensors of conductive polymers based on the piezoresistive effect, with large potential for applications, are not sufficiently investigated. This work reports on the piezoresistive effect of an intrinsically conductive polymer, polyaniline, which was prepared in the form of thin films by spin coating on polyethylene terephthalate substrates. The relationship between electrical response and mechanical solicitations is presented for different preparation conditions. The values of the gauge factor ranges from 10 to 22 for different samples and demonstrates the viability of these materials as piezoresistive sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Piezoresistive effect in spin-coated polyaniline thin films

et al. 2012

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“…In several studies, it has been established that PANI has a negative gauge factor (GF) [1,2]. The gauge factor is the ratio of relative change in electrical resistance R, as a function of the mechanical strain, and it characterizes the sensitivity of piezoresistive materials [3].…”

Section: Introductionmentioning

confidence: 99%

Embedded Conjugated Polymer Sensor Arrays for Load Transmission Measurement in Orthopaedic Implants

Micolini¹,

Holness²,

Johnson³

et al. 2017

Preprint

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Load transfer through orthopaedic joint implants is poorly understood. The longer-term outcomes of these implants are just starting to be studied, making it imperative to monitor contact loads across the entire joint implant interface to elucidate the force transmission and distribution mechanisms exhibited by these implants in service. This study proposes and demonstrates the design, implementation, and characterization of a 3D-printed smart polymer sensor array using conductive polyaniline (PANI) structures embedded within a polymeric parent phase. The piezoresistive characteristics of PANI were studied to characterize the sensing behaviours inherent to these embedded pressure sensor arrays. PANI's stable response to a continuous load, its stability throughout loading and unloading cycles, and its repeatable and linear response to incremental loading cycles together with the accuracy of these measurements were investigated. It is demonstrated that this specially developed multi-material additive manufacturing process for polyaniline is an attractive approach for the fabrication of implant components having embedded smart-polymer sensors for the measurement and analysis of joint loads in orthopaedic implants.

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“…Some of the devices possible with these materials are strain gauges, OLED, and gas sensors. The resistance of a conducting polymer varies when gasses are adsorbed on its surface which is used to build gas sensors while conducting polymers that show peizoresistive property are used in building strain gauges of high gauge factor [1][2][3][4][5]. In all these devices, the bulk resistance of the polymer film is measured which necessitates formation of a metal polymer contact.…”

Section: Introductionmentioning

confidence: 99%

Development of Technique for Making Ohmic Contacts to PEDOT-PSS Films

Bindu¹,

Kumar

Suresh³

2013

Lecture Notes in Electrical Engineering

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Conducting polymers (PEDOT-PSS) belong to a category of materials which are peizoresitive and are used in variety of applications like strain gauges, gas sensors and many more. Since these conducting polymers are semiconductors, four probe measurement of film resistance is necessary to avoid errors due to contact resistance and spreading resistances. In a device, it is cumbersome to make four probe measurements and convenient to make two probe measurements. Large differences in the work function of polymers and contacts metals lead to rectifying contacts rather than ohmic contacts. A two probe measurement technique of making ohmic contacts to PEDOT-PSS film pristine and doped with 5 % DMSO is presented. It has been shown that by coating the contact probes with carbon nano powder, ohmic contacts can be achieved. This method can be employed for all conducting polymer measurements.

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Intrinsically conductive polymer thin film piezoresistors

Cited by 27 publications

References 7 publications

Piezoresistive effect in spin-coated polyaniline thin films

Piezoresistive effect in spin-coated polyaniline thin films

Embedded Conjugated Polymer Sensor Arrays for Load Transmission Measurement in Orthopaedic Implants

Development of Technique for Making Ohmic Contacts to PEDOT-PSS Films

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