pH sensors based on polyelectrolytic hydrogels

被引：7

作者：

Guenther, M ^{[1
]}

Gerlach, G ^{[1
]}

Sorber, J ^{[1
]}

Suchaneck, G ^{[1
]}

Arndt, KF ^{[1
]}

Richter, A ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Solid State Elect, D-01069 Dresden, Germany

来源：

Smart Structures and Materials 2005: Electroactive Polymer Actuators and Devices( EAPAD) | 2005年 / 5759卷

关键词：

chemical sensor; polyelectrolytic hydrogel; pH-sensitive; swelling behavior;

D O I：

10.1117/12.605293

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The purpose of chemical sensors consists in converting chemical input data into output signals suitable for electronic measuring processes. The sensors are characterized by a material-recognizing element and a transducer. The transducer converts the non-electric measuring value into an electrical signal. Hydrogels are cross-linked polymers which swell in solvents to appreciable extent. The amount of solvent uptake depends on the polymer structure and can be made responsive to environmental factors, such as solvent composition, pH value, temperature, electrical voltage etc. Hydrogels are capable to convert reversibly chemical energy into mechanical energy making them interesting as sensitive material for appropriate sensors. In the present work, in order to realize pH sensors, poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAA) blend hydrogels with a pH value dependent swelling behavior were used as chemo-mechanical transducers. The influence of the kinetics of the induced charge (in the swollen polyclectrolyte gel) on the response time, the signal value and the sensitivity of the proposed pH sensors were investigated and the measurement conditions necessary for high signal reproducibility were determined.

引用

页码：540 / 548

页数：9

共 36 条

[1] Solute diffusion within hydrogels. Mechanisms and models [J].

Amsden, B .

MACROMOLECULES, 1998, 31 (23) :8382-8395

[2]

Arndt K-F, 2003, FINE MECH OPTICS, V48, P320

[3]

Arndt KF, 2000, POLYM ADVAN TECHNOL, V11, P496, DOI 10.1002/1099-1581(200008/12)11:8/12<496::AID-PAT996>3.3.CO

[4]

2-Z

[5]

Arndt KF, 1999, ACTA POLYM, V50, P383, DOI 10.1002/(SICI)1521-4044(19991201)50:11/12<383::AID-APOL383>3.3.CO

[6]

2-Q

[7] Electro-active polymers: current capabilities and challenges [J].

Bar-Cohen, Y .

SMART STRUCTURES AND MATERIALS 2002: ELECTROACTIVE POLYMER ACTUATORS AND DEVICES (EAPAD), 2002, 4695 :1-7

[8] Monitoring pH with organic-based field-effect transistors [J].

Bartic, C ;

Palan, B ;

Campitelli, A ;

Borghs, G .

SENSORS AND ACTUATORS B-CHEMICAL, 2002, 83 (1-3) :115-122

[9] Micromechanical cantilever as an ultrasensitive pH microsensor [J].

Bashir, R ;

Hilt, JZ ;

Elibol, O ;

Gupta, A ;

Peppas, NA .

APPLIED PHYSICS LETTERS, 2002, 81 (16) :3091-3093

[10] Functional hydrogel structures for autonomous flow control inside microfluidic channels [J].

Beebe, DJ ;

Moore, JS ;

Bauer, JM ;

Yu, Q ;

Liu, RH ;

Devadoss, C ;

Jo, BH .

NATURE, 2000, 404 (6778) :588-+

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