THE DESIGN OF DURABLE NA+-SELECTIVE CHEMFETS BASED ON POLYSILOXANE MEMBRANES

被引:56
作者
BRUNINK, JAJ
LUGTENBERG, RJW
BRZOZKA, Z
ENGBERSEN, JFJ
REINHOUDT, DN
机构
[1] UNIV TWENTE,ORGAN CHEM LAB,POB 217,7500 AE ENSCHEDE,NETHERLANDS
[2] UNIV TWENTE,MESA RES INST,7500 AE ENSCHEDE,NETHERLANDS
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1994年 / 378卷 / 1-2期
关键词
D O I
10.1016/0022-0728(94)87071-3
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The design of durable sodium-selective CHEMFETs based on the covalent attachment of a sodium-selective ionophore and tetraphenylborate anions to a polysiloxane membrane matrix is described. Simulations of the membrane potential of such CHEMFETs using an extended version of the model developed previously in our group, revealed that a membrane with a reduced mobile ionophore and completely immobilized anionic sites should give a sub-nernstain response owing to a counteracting diffusion potential. CHEMFETs with all possible combinations of free and covalently bound ionophore and borate anions were prepared and the effect of covalent binding on the sensing behaviour was studied. The attachment of both electroactive components to a polysiloxane membrane matrix results in CHEMFETs that respond to Na+ activities in aqueous solution with good selectivity, and an almost nernstian slope (56.7 mV decade-1). The polarity of the membrane plays a crucial role. The durability is improved by the covalent attachment of the electroactive components (more than 90 days).
引用
收藏
页码:185 / 200
页数:16
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