DEVELOPMENT OF DURABLE K-SELECTIVE CHEMICALLY-MODIFIED FIELD-EFFECT TRANSISTORS WITH FUNCTIONALIZED POLYSILOXANE MEMBRANES()

Citation
Dn. Reinhoudt et al., DEVELOPMENT OF DURABLE K-SELECTIVE CHEMICALLY-MODIFIED FIELD-EFFECT TRANSISTORS WITH FUNCTIONALIZED POLYSILOXANE MEMBRANES(), Analytical chemistry, 66(21), 1994, pp. 3618-3623
Citations number
33
Categorie Soggetti
Chemistry Analytical
Journal title
ISSN journal
00032700
Volume
66
Issue
21
Year of publication
1994
Pages
3618 - 3623
Database
ISI
SICI code
0003-2700(1994)66:21<3618:DODKCF>2.0.ZU;2-I
Abstract
Durable K+-selective chemically modified field effect transistors (CHE MFETs) with functionalized polysiloxane membranes have been developed. Polysiloxane membranes of different polarity, i.e., with different am ounts of (cyanopropyl) siloxane groups, incorporating a free or covale ntly bound hemispherand as the ionophore and free or covalently bound tetraphenylborate anions as ionic sites, were investigated for their p erformance as sensing membranes. The CHEMFETs based on polysiloxane wi th both ionophore and anionic site covalently attached to the membrane matrix showed K+ responses with an almost Nerstian slope in the range of concentration 10(-4)-10(-1) M in the presence of 0.1 M Na+ (log k( K,Na)(pot) = -3.2. Durability tests showed that these sensors respond satisfactorily in the desired range of potassium concentrations even a fter 10 months of continuous exposure to washing in a stream of tap wa ter.