17 research outputs found
The development of a Na+-sensitive field effect transistor based on calix[4]arene ionophore
The application of calix[4]arene receptor molecules for the development of a Na+-selective sensor based on chemically modified field effect transistors
The development of a Na+-sensitive field-effect transistor based on calix[4]arene receptor molecules
The development of a Na+-sensitive field effect transistor based on calix[4]arene receptor molecules: effects of anionic sites on the selectivity of Na@+@-sensitive FETS
The development of NA#+#-sensitive field-effect transistor based on calix[4]arene receptor molecules
Synthesis of mixed calix[4]arene receptor molecules: 25,26-27,28-bis-difunctionalized calix[4]arenes with a high Na/K-selectivity
Chemically modified field-effect transistors; a sodium ion selective sensor based on calix[4]arene receptor molecules
The development of an ion-sensitive field-effect transistor for sodium ions is described. Cahx[4]arene derivatives incorporated in a poly(vinyl chloride)-based membrane provide the selectivity. A poly(2-hydroxyethyl methacrylate) interlayer between the silicon dioxide gate and the sensing membrane is necessary to obtain a Na+-sensitive ISFET with Nernstian behaviour. The potentiometric selectivity coefficients (log Kij pot) for Na+ over K+ and Li+ are ¿1.9 and ¿2.5
The design of durable Na$+#-selective CHEMFETs based on polysiloxane membranes
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-nernstian 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)