研究目的
To establish a rapid and sensitive quantitative analysis method for TNT purity using Raman spectroscopy by addressing the poor reproducibility of peak area through the use of peak area ratios and silver nanoflowers as an enhancing substrate.
研究成果
The study successfully developed a quantitative method for TNT purity analysis using Raman spectroscopy with silver nanoflowers, achieving high reproducibility (relative error ≤9.3%) and good fitting correlations (around 0.99). This approach overcomes the limitations of poor peak area reproducibility and enables rapid, sensitive detection with reduced sample amounts.
研究不足
The method may be limited by the need for silver nanoflower preparation, potential variability in substrate enhancement, and the specific content ranges tested (2%-9% and 10%-90%). It may not be directly applicable to other explosives or impurities without similar characteristic peaks.
1：Experimental Design and Method Selection:
The study involved qualitative analysis of TNT, 2,4-DNT, and 2,6-DNT using Raman spectroscopy to identify characteristic peaks, followed by quantitative analysis using peak area ratios (A838/A823 for 2,4-DNT/TNT and A578/A823 for 2,6-DNT/TNT) with silver nanoflowers as a surface-enhanced Raman scattering (SERS) substrate to improve sensitivity and reproducibility.
2：Sample Selection and Data Sources:
Pure samples of TNT, 2,4-DNT, and 2,6-DNT were used, with mixtures prepared in specific content ranges (2%-9% and 10%-90% for DNTs).
3：List of Experimental Equipment and Materials:
Materials included polyvinylpyrrolidone (PVP), L-ascorbic acid, silver nitrate, TNT, 2,4-DNT, 2,6-DNT, methanol, and ethanol. Equipment included a portable Shimadzu Raman spectrometer Model OPAL 3000, centrifuge, and glass slides.
4：Experimental Procedures and Operational Workflow:
Silver nanoflowers were synthesized, samples were prepared on substrates, Raman spectra were measured with specific parameters (exposure time 1 s, power 100 mW, range 0-3250 cm?1), and peak areas were integrated using Origin software. Parallel experiments were conducted for reproducibility.
5：Data Analysis Methods:
Peak area ratios were calculated, standard curves were fitted exponentially, and statistical analysis included standard deviation and relative error calculations.
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