التفاصيل البيبلوغرافية
| العنوان: |
Core–Shell Plasmonic Nanostructures on Au Films as SERS Substrates: Thickness of Film and Quality Factor of Nanoparticle Matter |
| المؤلفون: |
Hemna Fathima (3805492), Nandita Mohandas (11147011), Blesson Sam Varghese (11147014), Parvathy Anupkumar (11147017), Rotti Srinivasamurthy Swathi (3594548), K. George Thomas (1271895) |
| سنة النشر: |
2021 |
| المجموعة: |
Smithsonian Institution: Digital Repository |
| مصطلحات موضوعية: |
Biophysics, Medicine, Cell Biology, Biotechnology, Evolutionary Biology, Cancer, Space Science, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, metal films, Nanoparticle Matter Assembling plas., SERS, propagating surface plasmons, Raman signal intensities, Raman signal enhancement factors, sandwich plasmonic platforms, SEM, MPTS, Raman signal intensity, Raman signal enhancements, Finite-difference time-domain simul., dye Rhodamine 6 G, SiO 2 shell, Ag |
| الوصف: |
Assembling plasmonic nanoparticles on metal films is an elegant method for the design of SERS platforms with dense hot spots and amplified electric fields. Interaction between the localized surface plasmons of metal nanoparticles within assemblies induces collective plasmonic modes which can further couple with the propagating surface plasmons prevailing on the metal films. Herein, we report on the electric field effects as well as Raman signal enhancements arising due to the sandwiching of Au and Ag core–shell nanoparticle assemblies on Au films with varying thicknesses of the underlying metal film. The sandwich plasmonic platforms are prepared by linking Ag@SiO 2 as well as Au@SiO 2 nanoparticles on Au films using (3-mercaptopropyl)trimethoxysilane (3-MPTS). The interaction between the SiO 2 shell on the Ag/Au nanoparticles and free silanol groups on 3-MPTS provides a monolayer of core–shell systems on the Au films, as corroborated by SEM images. Finite-difference time-domain simulations with heptamer models of Ag@SiO 2 and Au@SiO 2 particles on Au films confirm an enhancement in the electric field upon sandwiching the nanoparticle aggregates on the Au films. The Raman signal enhancement factors for the dye Rhodamine 6G are estimated, and the enhancement in the Raman signal intensities on Ag@SiO 2 over Au@SiO 2 assembled on a 20 nm Au film is attributed to the higher Q -factor of Ag. The largest measured Raman signal intensity on Ag@SiO 2 on a 60 nm thick Au film, ∼10 7 , is reasoned based on the variation of the electric field intensity of the Au film as a function of its thickness. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| العلاقة: |
https://figshare.com/articles/journal_contribution/Core_Shell_Plasmonic_Nanostructures_on_Au_Films_as_SERS_Substrates_Thickness_of_Film_and_Quality_Factor_of_Nanoparticle_Matter/14997826Test |
| DOI: |
10.1021/acs.jpcc.1c02339.s001 |
| الإتاحة: |
https://doi.org/10.1021/acs.jpcc.1c02339.s001Test |
| حقوق: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.3AD13B5A |
| قاعدة البيانات: |
BASE |
