Abstract
The paper reports on temperature behavior of strain sensitivity of recently introduced screen printing technology facilitating the realization of silver and carbon black piezoresistors embedded in organic coatings. Piezoresistive layers were prepared by screen printing directly on the top of the organic coating. Since no glue or carrying substrates are between the sensitive element and the device under test, the coupling factor is high and the strain is efficiently transferred to the sensing element. The strain induced changes in resistance (piezoresistive effect) are generally lower compared to the changes induced by temperature. The temperature dependence of the sensitivity to strain was investigated utilizing both single element piezoresistors and piezoresistors connected to a Wheatstone bridge. The study analyzes strain-gauges under longitudinal tensile and compressive strain and temperatures up to 80 °C. Screen printed strain gauges can provide reliable and robust strain measurements for coated metallic substrates, the sensor performance is comparable to the conventional solution with glued sensors.
Highlights
Organic materials take up importance in a wide range of electronic applications
The printed strain gauges were thermally cured at the recommended temperatures for each ink
The results show that, while the strain sensitivity of silver paste is constant over the measured temperature range, the sensitivity of carbon black has increased in the measured temperature range from 0 to 80 °C (GF 4.1 ÷ 5.8)
Summary
Organic materials take up importance in a wide range of electronic applications. It is possible to utilize them as conductive, semiconductive and insulating layers. The attractiveness of polymers and organic-inorganic composites increased in the field of sensing applications. Piezoresistive behavior can be observed on pure metals and their alloys (Pt, Au, Ag, NiCr, CuNi) [1], crystalline material and their poly-, nano-crystalline form (Si, Ge, GaAs, GaN, diamond) [2], polymers (PEDOT:PSS, PVDF:TrFe [3,4]), and composites of conductive or semiconductive micro- and nano-particles in polymer matrixes (polymeric silver or carbon black pastes [5], CNT-PDMS composites [6] and other poly-amide, -imide, PMMA composites [7]). In contrast to the majority of work in the field of organic strain sensitive elements, which has laid the focus mainly on flexible or wearable electronics, this work addresses the embedding of Proceedings 2017, 1, 618; doi:10.3390/proceedings1040618 www.mdpi.com/journal/proceedings
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