In this paper, nanostructured thin films comprising wide-bandgap polyphenyl substituted naphthalene (TPPs) and dielectric polystyrene (PS) are prepared by simple spin-coating method and employed as high-performance charge trapping layers in nonvolatile organic field-effect transistor (OFET) memory devices. Compared to the pure film counterparts, these nanostructured memory devices exhibit significant improvements in memory performance, both in memory capacities and device stabilities. The best device demonstrates a 25% enhancement of memory window (from 48 to 60 V) and 3 orders magnitude of enhancement of ON/OFF current ratio after 10⁴ s operation (from 1.7×10² to 2.8×10⁵). The most stable device achieves an ON/OFF current ratio of over 10⁴ at extrapolated 28 years. This is mainly because the isolated charge trapping nanostructures and the interfacial dipole layer formed on the surface of the hybrid nanoarrays, which induce a small built-in electric field, effectively prohibit the leakage current.

During the Beijing Winter Olympics, three sets of aerosol lidar in different regions were used to conduct continuous observations to study the optical properties and vertical distribution characteristics of atmospheric aerosol. Based on the lidar data and sun photometer data, the accurate lidar ratio was determined to improve the inversion accuracy of the aerosol backscattering coefficient. The influence of meteorological conditions such as temperature, relative humidity, wind speed, and wind direction on the optical properties of aerosol were analyzed, and the type of aerosol was classified by the depolarization ratio of aerosol particles and CALIPSO data. Furthermore, the backward trajectory analysis, potential source contribution function (PSCF), and concentration weighted trajectories (CWT) were employed to explore the sources and transport mechanisms of pollutants. The analysis found that the extinction coefficient under the atmospheric boundary layer during the Winter Olympics had a spatial distribution pattern of high value in the southeast and low value in the northwest. The occurrence of aerosol pollution events is not only caused by local emissions, but is also related to regional transmission.