Chemical sensors based on multiresponsive block copolymer hydrogels

Guenther, Margarita; Kuckling, Dirk; Corten, Cathrin; Gerlach, Gerald; Sorber, Joerg; Suchaneck, G.; Arndt, Karl‐Friedrich

doi:10.1016/j.snb.2006.10.054

Cited by 74 publications

(56 citation statements)

References 36 publications

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“…The hydrogel swelling leads to a bending of the silicon membrane and a therefore to an electrical output signal. (Guenther et al, 2007 Trinh et al reported the time-dependent response of a chemo-mechanical sensor by placing a pH-responsive hydrogel to the backside of a piezoresistive membrane, and estimated the degree of hydrogel constraint within the sensor. (Trinh et al, 2006) A new type of sensor which combines piezoresistive-responsive elements as mechanoelectrical transducers and the phase transition behaviour of hydrogels as a chemomechanical transducer has been recently developed.…”

Section: Smart Polymers As Sensorsmentioning

confidence: 99%

Smart Microfluidics: The Role of Stimuli- Responsive Polymers in Microfluidic Devices

Argentiere¹,

Gigli²,

Gerges³

et al. 2012

Advances in Microfluidics

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Section: Smart Polymers As Sensorsmentioning

confidence: 99%

Smart Microfluidics: The Role of Stimuli- Responsive Polymers in Microfluidic Devices

Argentiere¹,

Gigli²,

Gerges³

et al. 2012

Advances in Microfluidics

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“…a) P2VP-block-P(NIPAAm-co-DMIAAm) and P4VP-block-P(NIPAAm-co-DMIAAm) block copolymers These polymers were synthesized via NMRP (Nitroxide Mediated Radical Polymerization) (Benoit et al 1999) by sequential polymerization of 2-vinylpyridine (2VP) (or of 4-vinylpyridine (4VP), respectively) and a mixture of NIPAAm and DMIAAm. Using the macroinitiator method, the preparation of well-defined linear block copolymers consisting of a homo polymer block P2VP (or 4VP, respectively) (pH-sensitive), and a random copolymer block of PNIPAAm (temperature sensitive) and DMIAAm (photo cross-linker) was possible (Guenther et al 2007a). …”

Section: Photo Cross-linkable Copolymersmentioning

confidence: 99%

“…A discrete sensor construction was developed and the measuring principle for such sensors was confirmed. In order to realize chemical sensors, the polyelectrolyte as well as neutral gels were used as chemomechanical transducers Guenther et al , 2007aGuenther et al , 2008a. The hydrogel swelling leads to a bending of a thin silicon plate and, by this, to an electrical output voltage of the sensor chip.…”

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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“…Further limitations result from the visco-hyperelastic material properties, relaxation phenomena and creep leading to poor long-term stability and repeatability as well as limited sensor parameters [6]. Up to now, attempts to improve the sensor properties mostly appear to be materialbased approaches where the hydrogel properties are deliberately modified [7].…”

Section: Introduction and Significancementioning

confidence: 99%

A novel miniaturizable closed-loop hydrogel-based pH sensor

Schulz

Ebert

Gerlach

2011

2011 IEEE SENSORS Proceedings

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State-of-the-art hydrogel-based sensors are devices that use the hydrogel swelling due to a specific environmental trigger (e.g. pH-value). They directly convert the volume change of the hydrogel to an electrical output signal. Because hydrogels show relaxation behavior their long-term properties are poor and the sensor parameters are limited. To overcome these drawbacks we present a closed-loop hydrogel-based pH sensor that uses the compensation method. The hydrogel sensor itself is part of a feedback circuit comprising a PI controller and an actuator in the feedback loop. In our approach, the hydrogel volume is kept constant during the whole measuring process. This is accomplished by applying an appropriate counter pressure that compensates the swelling pressure of the hydrogel, and thus, its attempt to swell/shrink. This counter pressure is a direct measure of the applied pH-value. Here, preliminary measurement results, that confirm the applicability of the compensation method to hydrogel sensors, are shown.

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Chemical sensors based on multiresponsive block copolymer hydrogels

Cited by 74 publications

References 36 publications

Smart Microfluidics: The Role of Stimuli- Responsive Polymers in Microfluidic Devices

Smart Microfluidics: The Role of Stimuli- Responsive Polymers in Microfluidic Devices

Piezoresistive biochemical sensors based on hydrogels

A novel miniaturizable closed-loop hydrogel-based pH sensor

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