| Full text | |
| Author(s): |
Bar, Jaciara
[1]
;
de Barros, Anerise
[1]
;
de Camargo, Davi H. S.
[2]
;
Pereira, Mariane P.
[2]
;
Merces, Leandro
[2]
;
Shimizu, Flavio Makoto
[2, 3]
;
Sigoli, Fernando A.
[1]
;
Bof Bufon, Carlos Cesar
[2]
;
Mazali, Italo Odone
[1]
Total Authors: 9
|
| Affiliation: | [1] Univ Estadual Campinas, UNICAMP, Inst Chem, Lab Funct Mat, BR-13083970 Campinas, SP - Brazil
[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083100 Campinas, SP - Brazil
[3] Univ Estadual Campinas, UNICAMP, Gleb Wataghin Inst Phys IFGW, Dept Appl Phys, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | ACS APPLIED MATERIALS & INTERFACES; v. 13, n. 30, p. 36482-36491, AUG 4 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
The investigation of enhanced Raman signal effects and the preparation of high-quality, reliable surface-enhanced Raman scattering (SERS) substrates is still a hot topic in the SERS field. Herein, we report an effect based on the shape-induced enhanced Raman scattering (SIERS) to improve the action of gold nanorods (AuNRs) as a SERS substrate. Scattered electric field simulations reveal that bare V-shaped Si substrates exhibit spatially distributed interference patterns from the incident radiation used in the Raman experiment, resulting in constructive interference for an enhanced Raman signal. Experimental data show a 4.29 increase in Raman signal intensity for bare V-shaped Si microchannels when compared with flat Si substrates. The combination of Vshaped microchannels and uniform aggregates of AuNRs is the key feature to achieve detections in ultra-low concentrations, enabling reproducible SERS substrates having high performance and sensitivity. Besides SIERS effects, the geometric design of Vshaped microchannels also enables a ``trap{''} to the molecule confinement and builds up an excellent electromagnetic field distribution by AuNR aggregates. The statistical projection of SERS spectra combined with the SIERS effect displayed a silhouette coefficient of 0.83, indicating attomolar (10-18 mol L-1) detection with the V-shaped Si microchannel. (AU) | |
| FAPESP's process: | 14/25979-2 - Fabrication and characterization of devices and systems based on hybrid nanomembranes |
| Grantee: | Carlos César Bof Bufon |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 14/50906-9 - INCT 2014: in Functional Complex Materials |
| Grantee: | Fernando Galembeck |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/18136-0 - Hybrid nanodevices: magnetoelectronic transport and development of sensors based on molecules/nanomembranes |
| Grantee: | Leandro das Mercês Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/22127-2 - Development of novel materials strategic for integrated analytical devices |
| Grantee: | Lauro Tatsuo Kubota |
| Support Opportunities: | Research Projects - Thematic Grants |