Cutolo, Maria Alessandra (2023) Engineering SERS-active substrates: design and characterization of advanced structures and innovative materials. [Tesi di dottorato]
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| Item Type: | Tesi di dottorato |
|---|---|
| Resource language: | English |
| Title: | Engineering SERS-active substrates: design and characterization of advanced structures and innovative materials |
| Creators: | Creators Email Cutolo, Maria Alessandra mariaalessandra.cutolo@unina.it |
| Date: | 11 December 2023 |
| Number of Pages: | 180 |
| Institution: | Università degli Studi di Napoli Federico II |
| Department: | Ingegneria Elettrica e delle Tecnologie dell'Informazione |
| Dottorato: | Information technology and electrical engineering |
| Ciclo di dottorato: | 36 |
| Coordinatore del Corso di dottorato: | nome email RUSSO, STEFANO stefano.russo@unina.it |
| Tutor: | nome email BREGLIO, GIOVANNI UNSPECIFIED CUSANO, ANDREA UNSPECIFIED PISCO, MARCO UNSPECIFIED |
| Date: | 11 December 2023 |
| Number of Pages: | 180 |
| Keywords: | Hierarchical structures; SERS; self-assembly; nanolithography. |
| Settori scientifico-disciplinari del MIUR: | Area 09 - Ingegneria industriale e dell'informazione > ING-INF/01 - Elettronica |
| Date Deposited: | 11 Dec 2023 19:16 |
| Last Modified: | 10 Mar 2026 15:27 |
| URI: | http://www.fedoa.unina.it/id/eprint/15663 |
Collection description
In this thesis, I investigated the creation of SERS-active substrates by self-assembling hierarchical structures of plasmonic assisted nanospheres (HSNs). Since most SERS substrates are inherently planar, I demonstrate that a “hierarchical” approach could be systematically exploited to extend the SERS hotspots into the third dimension by improving the hot-spots spatial density and intensity. The proposed hierarchical architecture takes advantage of the classic ordered configuration of hexagonal closed packed array nanospheres (CPA). I used an additional layer of upper nanospheres to generate regular and intense hot spots pattern. I carried out a numerical analysis to predict SERS performance and to identify the most promising configurations, offering design criteria, an overview of the operating mechanisms and conditions that affect the SERS behavior of substrates. Two alternative methods of self-assembly were pursued to achieve gold-HSN, namely co-deposition and sequential deposition. Morphological analysis revealed the formation of well-ordered hierarchical structures with different ratios between bottom and upper nanosphere diameters. Experimental analysis of the SERS response shows that gold-HSN can function as economical SERS substrates with superior performance over CPA configurations. As an alternative approach, I also investigated the use of CMOS compatible materials, as innovative SERS materials. Silver and gold are commonly preferred materials for plasmonic applications but they are not compatible with CMOS process. In this thesis, I investigated the use of titanium nitride and nickel germanide. After the experimental characterization of the refractive index of these materials, I carried out a numerical analysis to outlines their potential benefits and limitations. The performed preliminary analysis revealed that nickel germanide is a promising candidate for SERS active substrates.
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