研究目的
To fabricate a flexible and recyclable surface-enhanced Raman scattering (SERS) substrate based on cotton fabric for sensitive detection and recyclable use in applications such as food safety monitoring.
研究成果
The recyclable SERS cotton fabric (RSCF) demonstrated high sensitivity with detection limits as low as 10-12 M for PATP, excellent reproducibility with less than 10% relative standard deviation, and effective recyclability through UV-assisted photocatalytic degradation over 180 minutes. It successfully detected carbaryl pesticide on fruit surfaces via swabbing, indicating potential for practical use in food safety and environmental monitoring. The study highlights the feasibility of flexible, recyclable SERS substrates for trace analyte detection, with recommendations for future work on optimizing degradation time and expanding to other contaminants.
研究不足
The recyclability requires UV light illumination for 180 minutes, which may limit real-time applications. The substrate's sensitivity and recyclability were tested primarily with model compounds (PATP, R6G) and one pesticide (carbaryl); broader applicability to other pollutants needs further validation. The use of a mercury lamp for UV irradiation might not be practical for all field applications.
1：Experimental Design and Method Selection:
The study involved designing a recyclable SERS substrate by decorating Ag nanoparticles on a TiO2 film deposited on cotton fabric using ultrasonic immersion and chemical reduction methods. The rationale was to leverage the synergetic effects of Ag/TiO2 heterostructure and the fabric's adsorption capacity for enhanced SERS performance and recyclability through photocatalytic degradation under UV light.
2：Sample Selection and Data Sources:
Pristine cotton fabric (220 g/m2, 4 cm2) was used as the base material. Probe molecules included p-Aminothiophenol (PATP), Rhodamine 6G (R6G), and carbaryl pesticide for SERS detection. Samples were prepared by dipping into solutions of different concentrations.
3：List of Experimental Equipment and Materials:
Equipment included Field Emission Scanning Electron Microscope (FE-SEM, S-4800, Japan), UV–visible spectrometer (UV, PerkinElmer, USA), X-ray diffractometer (D/max-2550 PC, Japan), and Raman microscope (Reflex-invia with 633 nm laser excitation). Materials included cotton fabric, TiO2 anatase powder, AgNO3, ascorbic acid, NaOH, and various chemicals from Shanghai Chemical Reagent Co., Ltd. and Sinopharm Chemical Reagent CO., Ltd.
4：Experimental Procedures and Operational Workflow:
The cotton fabric was pretreated with NaOH to remove impurities. TiO2 was deposited via ultrasonic immersion. Ag NPs were grafted by dipping in AgNO3 and reducing with ascorbic acid. SERS measurements were performed after dipping samples in probe solutions and drying. Photocatalytic degradation was carried out under UV light (mercury lamp, 500W) with SERS detection before and after irradiation.
5：Data Analysis Methods:
SERS spectra were analyzed for intensity and characteristic peaks. Enhancement factor (EF) was calculated using defined formulas. Reproducibility was assessed through relative standard deviation of Raman intensities from multiple points. XRD and UV-Vis spectra were used to confirm material compositions and structures.
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