Silver nanowires as infrared-active materials for surface-enhanced Raman scattering
| Autor: | Cristina Gellini, Monica Bracciali, Giangaetano Pietraperzia, Cristiana Lofrumento, Alessandro Feis, Giacomo Ghini, Silvana Trigari, Lorenzo Tognaccini, Marilena Ricci, Maurizio Becucci |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Infrared Scattering business.industry Far-infrared laser Nanowire 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences symbols.namesake nanowires silver SERS optoacoustic Extinction (optical mineralogy) symbols Optoelectronics General Materials Science Surface plasmon resonance 0210 nano-technology business Spectroscopy Raman scattering |
| Zdroj: | Nanoscale. 10:9329-9337 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c8nr00537k |
| Popis: | Surface-enhanced Raman scattering (SERS) is increasing in significance as a bioanalytical tool. Novel nanostructured metal substrates are required to improve performances and versatility of SERS spectroscopy. In particular, as biological tissues are relatively transparent in the infrared wavelength range, SERS-active materials suitable for infrared laser excitation are needed. Nanowires appear interesting in this respect as they show a very broad localized surface plasmon resonance band, ranging from near UV to near infrared wavelengths. The SERS activity of silver nanowires has been tested at three wavelengths and a fair enhancement at 1064 and 514 nm has been observed, whereas a very weak enhancement was present when exciting close to the nanowire extinction maximum. These experimentally measured optical properties have been contrasted with finite element method simulations. Furthermore, laser-induced optoacoustic spectroscopy measurements have shown that the extinction at 1064 nm is completely due to scattering. This result has an important implication that no heating occurs when silver nanowires are utilized as SERS-active substrates, thereby preventing possible thermal damage. |
| Databáze: | OpenAIRE |
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