Hydrogels for Chemical Sensors

Guenther, Margarita; Gerlach, Gerald

doi:10.1007/978-3-540-75645-3_5

Cited by 39 publications

(42 citation statements)

References 41 publications

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“…This behavior could also be reproduced during subsequent solvent changes. Stimuli-responsive hydrogels are already known for reversible swelling, as shown for temperature (Guenther et al, 2006), pH (Liu et al, 2016) and salt-sensitive (Izawa et al, 2009) hydrogels.…”

Section: Reversibility Of Hydrogel Swellingmentioning

confidence: 99%

Hydrogel-based piezoresistive sensor for the detection of ethanol

Erfkamp

Guenther

Gerlach

2018

J. Sens. Sens. Syst.

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Abstract. This article describes a low-cost sensor for the detection of ethanol in alcoholic beverages, which combines alcohol-sensitive hydrogels based on acrylamide and bisacrylamide and piezoresistive sensors. For reproducible measurements, the reversible swelling and deswelling of the hydrogel were shown via microscopy. The response time of the sensor depends on the swelling kinetics of the hydrogel. The selectivity of the hydrogel was tested in different alcohols. In order to understand the influence of monomer and crosslinker content on the swelling degree and on the sensitivity of the hydrogels, gels with variable concentrations of acrylamide and bisacrylamide were synthesized and characterized in different aqueous solutions with alcohol contents. The first measurements of such hydrogel-based piezoresistive ethanol sensors demonstrated a high sensitivity and a short response time over several measuring cycles.

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Section: Reversibility Of Hydrogel Swellingmentioning

confidence: 99%

Hydrogel-based piezoresistive sensor for the detection of ethanol

Erfkamp

Guenther

Gerlach

2018

J. Sens. Sens. Syst.

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“…4a).that the solution is pumped into and drawn out of the pressure chip's cavity containing the gel inside. This type of sensor was used mostly in the reported studies [17][18][19]. The other is as the batch configuration (Fig.…”

Section: Sensor Structure and Measurement Principlementioning

confidence: 99%

Development of hydrogel-based MEMS piezoresistive sensors for detection of solution pH and glucose concentration

2012

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Hydrogels are water-swollen polymeric materials that maintain a distinct three-dimensional structure. Manipulation of hydrogel structure has produced stimuli sensitive hydrogels, which change their swelling degree or undergo phase transition in response to minimal changes in environmental conditions. This paper presents the development of hydrogel-based sensors for measurement of solution pH and glucose concentration using commercial MEMS piezoresistive pressure transducers. pH-sensitive PVA/PAA and glucose-sensitive AAm/3-APB/BIS hydrogels are used in the experiments. Two types of sensor packaging, one is used as solution container and the other used to dip into solution have been performed. The measurements for different solutions having pH values between 1 to 11 and glucose concentrations between 2.5 mM and 15 mM have been carried out. The output characteristics of sensors have been demonstrated showing the long-term reproduction and relatively good sensitivity, namely approximately 20 mV/pH for pH sensor and 7 mV/1 mM of glucose concentration for glucose sensor.

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“…In order to achieve an optimum between sensor signal amplitude and sensor response time, the gel swelling/deswelling kinetics was investigated (Guenther et al 2007b). Some methods improving the properties of the chemical sensors have been proposed (Guenther et al 2008a;Guenther and Gerlach 2009). The long-term measurements have shown that the lifetime of piezoresistive chemical sensors can be prolonged up to several years provided that specific operation and storage conditions are fulfilled (Guenther et al 2009c).…”

Section: Introductionmentioning

confidence: 99%

Piezoresistive biochemical sensors based on hydrogels

2009

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Already 8 years ago, the usage of piezoresistive sensors for chemical measurands was proposed at the Solid State Electronics Laboratory of the Dresden University of Technology. Adding functionalised polymer coating which shows swelling due to chemical or biological values leads to a similar deflection of the thin silicon bending plate like for pressure sensors. The application of ''stimuli-responsive'' or ''smart'' cross-linked gels in chemical sensors is based on their ability to a phase transition under the influence of external excitations (pH, concentration of additives in water, temperature). Combining a ''smart'' hydrogel and a micro fabricated pressure sensor chip allows to continuously monitor the analyte-dependent swelling of a hydrogel and hence the analyte concentration in ambient aqueous solutions. The sensitivity of hydrogels with regard to the concentration of such additives as H ? -ions (pH sensor), transition-metal ions, salts, organic solvents and proteins in water was investigated.

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Hydrogels for Chemical Sensors

Cited by 39 publications

References 41 publications

Hydrogel-based piezoresistive sensor for the detection of ethanol

Hydrogel-based piezoresistive sensor for the detection of ethanol

Development of hydrogel-based MEMS piezoresistive sensors for detection of solution pH and glucose concentration

Piezoresistive biochemical sensors based on hydrogels

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