Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes
Surface-enhanced Raman spectroscopy (SERS) is an extremely responsive and selective method that improves the Raman scattering signals of molecules utilizing nanomaterials as substrates. SERS enables the identification of material in very low concentrations via electrical field amplification or chem...
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University of Baghdad, College of Science for Women
2024-10-01
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| Series: | مجلة بغداد للعلوم |
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| Online Access: | https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/9152 |
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| author | Zinah Salahuddin Shakir Sameer Khudhur Yaseen Ayad Abdul Razzak Dhaigham |
| author_facet | Zinah Salahuddin Shakir Sameer Khudhur Yaseen Ayad Abdul Razzak Dhaigham |
| author_sort | Zinah Salahuddin Shakir |
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Surface-enhanced Raman spectroscopy (SERS) is an extremely responsive and selective method that improves the Raman scattering signals of molecules utilizing nanomaterials as substrates. SERS enables the identification of material in very low concentrations via electrical field amplification or chemical enhancement due to the localized surface Plasmon (LSP). In this work, low concentrations of sodium sulfate (Na2SO4) were investigated as a water pollutant using liquid SERS based on colloidal Ag nanostructures. Two types of Ag nanostructures were prepared and utilized as liquid SERS substrates: nanostars (NSs) and nanocubes (NCs). A chemical reduction method was used for synthesizing Ag nanostructures from silver ions using reducing agents. An atomic force microscope (AFM) and Scanning Electron Microscope (SEM) were employed to characterize the nanosilver. The SERS actions of these nanostructures in detecting sodium sulfates were reported and analyzed concerning both shape and size using a 532 nm diode-pumped solid-state laser. We observed that nanostructures with more and more shaped corners gave stronger SERS signals. The increase in the SERS signal is related to LSP, which results from the deposition of sodium sulfate molecules in the hotspots (spaces between aggregated silver nanostructures) in the solution. Raman peaks intensify as the sulfate concentration increases. The proposed AgNS colloid provides stronger SERS activity than the AgNC colloid. This means that AgNS as liquid SERS substrates are more efficient at detecting low concentrations of analytes than AgNC. The highest sulfate analytical enhancement factor (AEF) obtained for SERS in both colloids, AgNS and AgNC, were at the lowest concentrations (7x10-7 M), which were 2.6 x103 and 1.7x 103, respectively.
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| language | English |
| publishDate | 2024-10-01 |
| publisher | University of Baghdad, College of Science for Women |
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| series | مجلة بغداد للعلوم |
| spelling | doaj-art-89b112a613d446b9b39d03bccd7890892025-08-20T03:56:58ZengUniversity of Baghdad, College of Science for Womenمجلة بغداد للعلوم2078-86652411-79862024-10-01211010.21123/bsj.2024.9152Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver NanocubesZinah Salahuddin Shakir0https://orcid.org/0000-0003-0716-3702Sameer Khudhur Yaseen1Ayad Abdul Razzak Dhaigham2Institute of Laser for Postgraduate Studies, University of Baghdad, Baghdad, Iraq & Department of Applied Sciences, University of Technology, Baghdad, Iraq.Department of Physics, College of Science for Women, University of Baghdad, Baghdad, Iraq.Directorate of Materials Research, Ministry of Science & Technology, Baghdad, Iraq. Surface-enhanced Raman spectroscopy (SERS) is an extremely responsive and selective method that improves the Raman scattering signals of molecules utilizing nanomaterials as substrates. SERS enables the identification of material in very low concentrations via electrical field amplification or chemical enhancement due to the localized surface Plasmon (LSP). In this work, low concentrations of sodium sulfate (Na2SO4) were investigated as a water pollutant using liquid SERS based on colloidal Ag nanostructures. Two types of Ag nanostructures were prepared and utilized as liquid SERS substrates: nanostars (NSs) and nanocubes (NCs). A chemical reduction method was used for synthesizing Ag nanostructures from silver ions using reducing agents. An atomic force microscope (AFM) and Scanning Electron Microscope (SEM) were employed to characterize the nanosilver. The SERS actions of these nanostructures in detecting sodium sulfates were reported and analyzed concerning both shape and size using a 532 nm diode-pumped solid-state laser. We observed that nanostructures with more and more shaped corners gave stronger SERS signals. The increase in the SERS signal is related to LSP, which results from the deposition of sodium sulfate molecules in the hotspots (spaces between aggregated silver nanostructures) in the solution. Raman peaks intensify as the sulfate concentration increases. The proposed AgNS colloid provides stronger SERS activity than the AgNC colloid. This means that AgNS as liquid SERS substrates are more efficient at detecting low concentrations of analytes than AgNC. The highest sulfate analytical enhancement factor (AEF) obtained for SERS in both colloids, AgNS and AgNC, were at the lowest concentrations (7x10-7 M), which were 2.6 x103 and 1.7x 103, respectively. https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/9152AgNps, Hotspot, Raman spectroscopy, Sodium sulfates, Surface Plasmon resonance |
| spellingShingle | Zinah Salahuddin Shakir Sameer Khudhur Yaseen Ayad Abdul Razzak Dhaigham Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes مجلة بغداد للعلوم AgNps, Hotspot, Raman spectroscopy, Sodium sulfates, Surface Plasmon resonance |
| title | Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes |
| title_full | Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes |
| title_fullStr | Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes |
| title_full_unstemmed | Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes |
| title_short | Comparison of Surface-Enhanced Raman Scattering in Colloidal Silver Nanostar and Colloidal Silver Nanocubes |
| title_sort | comparison of surface enhanced raman scattering in colloidal silver nanostar and colloidal silver nanocubes |
| topic | AgNps, Hotspot, Raman spectroscopy, Sodium sulfates, Surface Plasmon resonance |
| url | https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/9152 |
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