No abstract

No abstract

Ion-sensitive field-effect transistors (ISFETs) are a promising platform for real-time, continuous monitoring of sodium ions in human sweat. However, realization of true wearable sensors is restricted owing to bulky reference electrodes. Herein, we demonstrate carbon nanotube (CNT)-based ISFETs with an onchip reference electrode suitable for wearable sodium detection. An Ag/AgCl ink and a polyvinyl butyral membrane are utilized to fabricate the integrated reference electrode with a compact size. The CNT surface is functionalized with a polyvinyl chloride-based sodium-selective membrane composed of a specific ionophore to capture sodium ions. The sodium sensor shows the sensitive detection of sodium ions in a range from 0.1 to 100 mM, which covers human sweat sodium concentrations and good selectivity for interfering ions existing in sweat such as potassium, calcium, and magnesium ions. The miniaturized reference electrode can provide a stable potential comparable to that of a commercial reference electrode. The sensor has the ability to selectively detect the sodium ions in artificial sweat.

Abstract-The article presents the recent research development in polymer ferroelectric non-volatile memory. A brief overview is given of the history of ferroelectric memory and device architectures based on inorganic ferroelectric materials. Particular emphasis is made on device elements such as metal/ferroelectric/metal type capacitor, metalferroelectric-insulator-semiconductor (MFIS) and ferroelectric field effect transistor (FeFET) with ferroelectric poly(vinylidene fluoride) (PVDF) and its copolymers with trifluoroethylene (TrFE). In addition, various material and process issues for realization of polymer ferroelectric non-volatile memory are discussed, including the control of crystal polymorphs, film thickness, crystallization and crystal orientation and the unconventional patterning techniques.

Hydrogen has unique physical and chemical properties which present benefits and challenges to its successful widespread adoption as a fuel. The photoelectrochemical (PEC) water splitting process with semiconductor metal oxides can be a promising solution to the global energy problem. Although amongst metal oxides Fe2O3 by 2.2 eV bang gap energy is more applicable, for reducing the recombination of electron and hole, Fe was doped into TiO2. In this study Fe2O3/Fe doped TiO2 photocatalysts were compared with Fe-doped TiO2 and TiO2 structures by using layer by layer-self-assemble (LBL-SA) method and dipping process on FTO glass. According to our results the Fe2O3 coated on Fe doped TiO2 /FTO has had best results.