To develop efficient and convenient sensing technology for volatile organic compound (VOCs) detection in residential buildings and process control in industries becomes necessary for human health. Various ZnO nanostructures have been employed in VOC detection for their good performance. Among those nanostructures, porous single-crystalline (PSC) ZnO nanosheets not only exhibited highly-sensitive performance but also possessed significantly long-term stability. However, the sensitivity might be further improved by modification noble metal elements. In present work, Ag nanoparticles have been decorated onto the PSC ZnO nanosheets by a sunlight induced solvent reduction method. The as-prepared products have been characterized by SEM, TEM, HRTEM and EDS. By combining the advantages of structure and modification, the sensitivity of the Ag-decorated PSC ZnO nanosheets is 8.8 times higher than that of the bare one. The single-crystalline structure exhibited low electric noise which may lower the detection limit of the sensor.
Lightweight materials applied in construction field were prepared using waste iron mine tailings (WIMT) as raw materials, the commercial silicate cement (CSC) as cementing agent, NaOH as the alkali activator, and triethanolamine lauryl sulfate (TLS) as foaming agent via foam-gelcasting method. The effects of water/cement (W/C) mass ratio (0.6-1.0), addition of NaOH (0-0.15wt%) and foaming agent (0-0.3vol%) on the porosity, bulk density, and mechanical properties of the iron mine tailing-based lightweight materials were studied. The results showed that the mechanical properties of iron mine tailing-based lightweight materials were improved by adding NaOH, the as-prepared materials had a 7-day compressive strength of 5.18 MPa, porosity of 51.40%, bulk density of 1.73 g/cm3and thermal conductivity of 0.193 W・(m-1K-1) when the W/C ratio was 0.8, the mass ratio of WIMT/CSC/NaOH 1.85:1:0.15, and foaming agent content 0.3vol%.
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