Three-dimensional topological insulators (TIs) exhibit time-reversal symmetry protected, linearly dispersing Dirac surface states with spin-momentum locking. Band bending at the TI surface may also lead to coexisting trivial two-dimensional electron gas (2DEG) states with parabolic energy dispersion. A bias current is expected to generate spin polarization in both systems, although with differe...

The realisation of a miniaturised potentiometric enzyme biosensor is presented. The biosensor chip utilises the enzyme organophosphorus hydrolase (OPH) for the direct determination of pesticides. The transducer structure of the sensor chip consists of a pHsensitive capacitive electrolyte-insulator-semiconductor (EIS) structure that reacts towards pH changes caused by the OPH-catalysed hydrolysi...

Sensitive biosensors for detection of triglyceride concentration are important. In this paper we report on two types of silicon based triglyceride sensors: an electrolyte-insulator-semiconductor capacitor (EISCAP) which is a potentiometric device and a polysilicon microcantilever. The detection principle for both sensors is based on the enzymatic hydrolysis of triglyceride though the sensing me...

Malonamides are known and extensively studied for their lanthanide and actinide extracting properties. Those studies have also highlighted aggregated phenomena and a splitting of the organic phase, in some particular experimental conditions. To explain this behaviour of extractants, (1)H NMR was used to study micellar phenomena by the determination of the self-diffusion coefficients of two malo...

Chalcogenide glasses offer an excellent “challenge” for their use and implementation in sensor arrays due to their good sensor-specific advantages in comparison to their crystalline counterparts. This paper will give an introduction on the preparation of chalcogenide glasses in the thin-film state. First, single microsensors have been prepared with the methods of semiconductor technology. In a ...

Here we report on a new architecture for potentiometric NO2 sensors that features thin 8YSZ electrolytes sandwiched between two porous (La0.8Sr0.2)0.95MnO3 (LSM95) layers-one thick and the other thin-fabricated by the tape casting and co-firing techniques. Measurements of their sensing characteristics show that reducing the porosity of the supporting LSM95 reference electrodes can increase the ...

A time-of-flight-type flow-velocity sensor employing the in-situ electrochemically generation of ion-tracers is developed. The sensor consists of an ion generator and two downstream-placed pH-sensitive Ta2O5-gate ISFETs (ion-sensitive field-effect transistor) that detect generated Hor OH-ions. The results of the developed flow-velocity sensor under different modes of ion generation are presente...

Urease has been covalently immobilized on polypyrrole microspheres chemically linked to conducting polypyrrole-polyvinyl sulfonate (PPY-PVS) films. These films were electrochemically prepared during 5 7 min at a constant current of 2 mA using indium tin oxide (ITO) glass plates as the working electrode, and a standard calomel electrode as the reference electrode. Urease covalently linked to pol...

A novel paper-based potentiometric platform for the simple and fast monitoring of water hardness is presented. First, ion-selective electrodes calcium magnesium printed on a paper substrate were built optimized. These sensors, which display near-Nernstian sensitivity, used determination concentration these cations calculation hardness. Second, incorporation solid-state reference electrode allow...

The oxidation-reduction equilibrium of human hemoglobin treated with various sulfhydryl reagents has been studied. The following modified hemoglobins have been characterized: hemoglobin treated with cystine, hemoglobin treated w2th cystamine, hemoglobin treated with iodoacetamide, and hemoglobin treated with 2 eq of p-mercuribenzoate. In all cases the modified hemoglobins have an oxidationreduc...