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Single-crystalline SnO2 nanowires were directly grown on an amorphous WOx thin film, leading to the formation of nano-scale contacts with a near-Ohmic conductance. The WOx facilitated the diffusion of SnO2 on the surface of the WOx thin film, and SnO2 nanowires could be uniformly grown from the diffused SnO2. The contact properties between the metallic WOx and a semiconducting SnO2 nanowire were examined. The resistivity of the WOx–SnO2 nanowire contact was found to be approximately 2.6 × 10−5 Ω cm2. This was comparable to the resistivity of a contact between an Al electrode and a SnO2 nanowire with a contact area. A fabricated SnO2 nanowire transistor exhibited an on-current of approximately 386 nA, a threshold voltage of approximately 3.8 V, a subthreshold slope of approximately 0.26 V/dec and a field-effect mobility of approximately 43 cm2 V−1 s−1. [ABSTRACT FROM AUTHOR]

With the increasing trend of high-rise, large-scale, and functional modern architectural structures, lightweight aggregate (LWA) concrete that exhibits excellent strength and high functionality has garnered active research attention. In particular, as the properties of concrete vary considerably with the raw materials and the proportions of aggregates in the mix, in-depth research on weight reduction, strength improvement, and functional enhancements of aggregates is crucial. This study used the negative pressure coating of a mixed solution comprising epoxy (mixture of epoxy resin and crosslinker), hyper-crosslinked polymer, and titanium oxide (TiO 2 ) nanoparticles on the LWA, and achieved an improvement in the strength of the LWA as well as a reduction in air pollutants such as NO x and SO x . Compared to a normal LWA with an aggregate impact value (AIV) of 38.7%, the AIV of the proposed epoxy-TiO 2 -embedded high-strength functional LWA was reduced by approximately half to 21.1%. In addition, the reduction rates of NO x and SO x gases resulting from the photocatalytic properties of TiO 2 nanoparticles coated with epoxy were approximately 90.9% and 92.8%, respectively. Epoxy-TiO 2 , embedded in LWAs through a mixture, exhibited stability, high strength, and a reduction in air pollutant characteristics, despite repeated water washing. The LWA proposed herein offers excellent structural and functional properties and is expected to be used in functional lightweight concrete that can be practically applied in high-rise and large-scale architectural structures.

The controllability and stability of nanowire transistor characteristics are essential for the development of low-noise and fast-switching nano-electronic devices. In this study, the positive shift of threshold voltage and the improvement of interface quality on In2O3 nanowire transistors were simultaneously achieved by using octadecylphosphonic acid (OD-PA) self-assembly. Following the chemical bond of OD-PA molecules on the surface of In2O3 nanowires, the threshold voltage was positively shifted to 2.95 V, and the noise amplitude decreased to approximately 87.5%. The results suggest that an OD-PA self-assembled monolayer can be used to manipulate and stabilize the transistor characteristics of nanowire-based memory and display devices that require high-sensitivity, low-noise, and fast-response.