The unique refractory plasmonic properties and strong enhancement of the electric field within the inherent gap of titanium nitride (TiN) nanodonuts make them excellent candidates for surface-enhanced Raman scattering (SERS)- and refractive index (RI)-sensing applications. The eccentricity and split angles are critical parameters for tuning the localized surface plasmon resonance (LSPR) properties of the donuts, which were numerically investigated using the finite element method herein. We demonstrated that the proposed donuts provided efficient SERS and RI sensing substrates capable of working in regions ranging from ultraviolet (UV) to near-infrared (NIR). By adjusting the eccentricity and split angles, the corresponding optimized RI sensitivity and SERS enhancement factor reached 1,374 nm/RIU and 6.8 × 104, respectively. Moreover, the effects of both incident polarisation and electromagnetic (EM) field distributions on the LSPR properties were elucidated and discussed. This study provides new insights for understanding the LSPR properties of TiN nanoparticles and enables the rational design of efficient refractory plasmon-based SERS and RI-sensing substrates.
Rock cave landfill has the characteristics of superior geological conditions and strong risk controllability. In this study, taking the first rock cave type nontraditional solid waste landfill in a uranium mine in China as an example, combined with the hydrogeological conditions and engineering characteristics of the mining area, the solute transport model of underground water in a rock cave type nontraditional solid waste landfill was constructed, and the characteristic pollutants were identified, and the pollution migration law of total chromium in the impervious barrier with damaged holes was simulated and characterized. The results show that the leakage of pollutants will affect the groundwater environment when the impervious barrier of the landfill is damaged. The pollution plume exceeding the standard is mainly concentrated in the groundwater aquifer within the landfill area, which is less likely to spread to the off-site environment. The vertical high concentration pollution plume is primarily distributed in the landfill layer. According to the characteristics of rock cave landfills, it is suggested that hazardous solid waste should be separated from surrounding rock. The research results can provide technical guidance for groundwater environment prediction and prevention measures for the same type of project.
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