Application of sensitive hydrogels in chemical and pH sensors

被引：67

作者：

Gerlach, G

Guenther, M

Suchaneck, G

Sorber, J

Arndt, KF

Richter, A

机构：

[1] Dresden Univ Technol, Inst Solid State Elect, D-01062 Dresden, Germany

[2] Dresden Univ Technol, Inst Phys Chem & Electrochem, D-01062 Dresden, Germany

来源：

MACROMOLECULAR SYMPOSIA | 2004年 / 210卷

关键词：

hydrogels; pH-sensitive; sensors; solvent composition; swelling;

D O I：

10.1002/masy.200450645

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In the present work, pH-sensitive poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAA) blends as well as hydrogels based on poly(N-isopropylacrylamide) (PNIPAAm), which are sensitive to organic solvent concentration in aqueous solutions, were used in silicon micromachined sensors. A sensitivity of approximately 15 mV/pH was obtained for a pH sensor with a 50 mum thick PVA/PAA hydrogel layer in a pH range above the acid exponent of acrylic acid (pK(a)=4.7). The output voltage versus pH-value characteristics and the long-term signal stability of hydrogel-based sensors were investigated and the measurement conditions necessary for high signal reproducibility were determined. The influence of the preparation conditions of the hydrogel films on the sensitivity and response time of the chemical and pH sensors is discussed.

引用

页码：403 / 410

页数：8

共 14 条

[1]

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

[2]

2-Z

[3]

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

[4]

2-Q

[5] 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

[6] Fiber optic Bragg grating sensor based on hydrogels for measuring salinity [J].

Cong, J ;

Zhang, XM ;

Chen, KS ;

Xu, J .

SENSORS AND ACTUATORS B-CHEMICAL, 2002, 87 (03) :487-490

[7] MASS-TRANSFER IN PH-SENSITIVE HYDROGELS [J].

GEHRKE, SH ;

CUSSLER, EL .

CHEMICAL ENGINEERING SCIENCE, 1989, 44 (03) :559-566

[8]

Gerlach G., German patents, Patent No. [DE 101 29 985C2, 10129985]

[9] A swelling hydrogel-based PCO2 sensor [J].

Herber, S ;

Olthuis, W ;

Bergveld, P .

SENSORS AND ACTUATORS B-CHEMICAL, 2003, 91 (1-3) :378-382

[10]

Jianqi F., 2002, EUR POLYM J, V38, P1653

← 1 2 →