Role of TiO2 Nanoparticles and UV Irradiation in the Enhancement of SERS Spectra To Improve Levamisole and Cocaine Detection on Au Substrates
| Autor: | Adéla Jeništová, Vladimír Setnička, Pavel Matějka, Veronika Skoupá |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology 010402 general chemistry medicine.disease_cause 01 natural sciences Nanomaterials symbols.namesake Electrochemistry medicine General Materials Science Irradiation Photodegradation Spectroscopy Detection limit Substrate (chemistry) Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry symbols 0210 nano-technology Raman spectroscopy Platinum Ultraviolet Nuclear chemistry |
| Zdroj: | Langmuir. 35:4540-4547 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.9b00358 |
| Popis: | The original goal of this study was the employment of surface-enhanced Raman spectroscopy (SERS) for the analysis of real cocaine samples (containing adulterants) on composite Au-TiO2 nanomaterials to achieve low detection limits suitable for the analysis of illicit drugs and controlled substances and to exploit the photodegradation activity of TiO2 to recycle the SERS substrate for repeated analyses. The photodegradation (self-cleaning) effects of the Au-TiO2 composite nanomaterials by ultraviolet (UV) radiation are known. These effects were investigated on large-area SERS substrates immersed in the TiO2 nanoparticle aqueous suspension. The cocaine samples were measured on electrochemically gold-plated platinum targets. Surprisingly, the intensity of SERS spectra of the pure cocaine did not change after immersion in a suspension of TiO2 under UV irradiation. However, for some real cocaine samples, the overall intensity of the SERS spectra was even higher after the treatment by TiO2 and UV radiation as co... |
| Databáze: | OpenAIRE |
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