Self-Assembly of Silver Nanowire Films for Surface-Enhanced Raman Scattering Applications
The development of SERS detection technology is challenged by the difficulty in obtaining SERS active substrates that are easily prepared, highly sensitive, and reliable. Many high-quality hotspot structures exist in aligned Ag nanowires (NWs) arrays. This study used a simple self-assembly method wi...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-04-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/13/8/1358 |
| Summary: | The development of SERS detection technology is challenged by the difficulty in obtaining SERS active substrates that are easily prepared, highly sensitive, and reliable. Many high-quality hotspot structures exist in aligned Ag nanowires (NWs) arrays. This study used a simple self-assembly method with a liquid surface to prepare a highly aligned AgNW array film to form a sensitive and reliable SERS substrate. To estimate the signal reproducibility of the AgNW substrate, the RSD of SERS intensity of 1.0 × 10<sup>−10</sup> M Rhodamine 6G (R6G) in an aqueous solution at 1364 cm<sup>−1</sup> was calculated to be as low as 4.7%. The detection ability of the AgNW substrate was close to the single molecule level, and even the R6G signal of 1.0 × 10<sup>−16</sup> M R6G could be detected with a resonance enhancement factor (EF) as high as 6.12 × 10<sup>11</sup> under 532 nm laser excitation. The EF without the resonance effect was 2.35 × 10<sup>6</sup> using 633 nm laser excitation. FDTD simulations have confirmed that the uniform distribution of hot spots inside the aligned AgNW substrate amplifies the SERS signal. |
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| ISSN: | 2079-4991 |