研究目的
Developing a simple SERS sensor for the rapid and effective detection of polycyclic aromatic hydrocarbons (PAH) using an undecorated gold-colloid substrate.
研究成果
The developed SERS sensor using Au-NP colloid coupled with Cl? provides a simple, rapid, and effective method for the detection and identification of PAH at trace levels. It shows great promise for field applications in environmental monitoring.
研究不足
The study focused on three specific PAH and may not cover the full range of PAH pollutants. The method's effectiveness in real-world environmental samples with complex matrices was not extensively tested.
1：Experimental Design and Method Selection:
The study employed a surface-enhanced Raman spectroscopy (SERS) sensor based on gold nanoparticles (Au-NP) colloid for PAH detection. The enhancement was achieved by adjusting chemical reduction conditions and Cl? content.
2：Sample Selection and Data Sources:
Three common PAH (naphthalene, phenanthrene, and pyrene) were selected for testing. Stock solutions were prepared by dissolving solid substances in ethanol, and desired PAH working solutions were made by diluting stock solutions in Milli-Q water.
3：List of Experimental Equipment and Materials:
Equipment included a portable QEpro 65000 Raman spectrometer, Agilent Cary 5000 UV-vis spectrometer, and S-5500 electron microscope. Materials included chloroauric acid tetrahydrate, trisodium citrate dehydrate, hydrochloric acid, nitric acid, naphthalene, phenanthrene, pyrene, pure ethanol, and sodium chloride.
4：Experimental Procedures and Operational Workflow:
Au colloids were synthesized by chemical reduction method. SERS samples were prepared by mixing working solution with Au-NP colloid and adding NaCl solution. Raman data were collected with specific acquisition time and scan averaging.
5：Data Analysis Methods:
The SERS enhancement factor for each PAH was calculated. The dependence of Raman intensities on the concentrations of PAH was plotted and analyzed.
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