Two-dimensional (2D) materials possess unique properties and advantages in catalysis, photo/-electronic and sensor devices. Here, we proposed a facile route to synthesize 2D ZnO nanoplates with grids by the oxalic-acid-assisted hydrothermal method. Morphology evolutions of ZnO from 3D flower-like microparticles to 2D nanonets were achieved by changing the heat-treatment temperature. By substitution for oxalic acid, 3D ZnO cagelike spheres and hexagonal prism were obtained. The results show that 2D and 3D morphologies of ZnO can be controlled easily by changing calcinations temperatures and additives. The as-prepared ZnO was used as sensing materials for the detection of volatile organic compounds, which indicate that their responses and selectivity are strongly dependent on the diversity of ZnO morphologies. Particularly, 2D ZnO nanonets-based sensor has been proved to detect triethylamine (TEA) efficiently, and it exhibits maximum sensitivity (213.3) on the exposure of 100 ppm triethylamine at 260 °C. Its transient response time is 1 s and recovery time is only 5 s exposed 300 ppm TEA, and the low detection limit is 63 ppb, implying 2D ZnO nanonets can be served as an efficient sensor platform for the detection of TEA.

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Porous Graphitic carbon nitride(pg-C 3 N 4 ) possessing hierarchical pores and lamellar nanostrucutres was synthesized in the absent of templates by pyrolysis of the solution-assisted mixing dual-precursors. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 porosimeter, X-ray photoelectron spectroscopy, UV-Vis andphotoluminescence spectroscopy.The photocatalytic activities of as-prepared materials for degradation of methyl violet were studied. The results show that the as-prepared g-C 3 N 4 consists of well-dispersed layers with uniform sizeand hierarchical (Meso/Macro) pores in the nanosheets, which favor photogenerated electron-hole pairs'separation, and the degradation of methyl violet conforms to the quasi-first-order kinetic model. The porous g-C 3 N 4 synthesized by optimizing precursors' ratios exhibited faster degradation rate than g-CN material in the process of photocatalyzing methyl violet andthe degradation rate was over 93 % after irradiation of 180 min, implying that the as-prepared hierarchically porous g-C 3 N 4 is a high-effective and metal-free photocatalytic material for degradation of pollutants.

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