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ZANGANA, S. LEDNICKÝ, T. BONYÁR, A.
Original Title
Three Generations of Surface Nanocomposites Based on Hexagonally Ordered Gold Nanoparticle Layers and Their Application for Surface-Enhanced Raman Spectroscopy
Type
journal article in Web of Science
Language
English
Original Abstract
The fabrication technology of surface nanocomposites based on hexagonally ordered gold nanoparticle (AuNP) layers (quasi-arrays) and their possible application as surface-enhanced Raman spectroscopy (SERS) substrates are presented in this paper. The nanoparticle layers are prepared using a nanotextured template formed by porous anodic alumina (PAA) and combined with gold thin-film deposition and subsequent solid-state dewetting. Three types of hexagonal arrangements were prepared with different D/D-0 values (where D is the interparticle gap, and D-0 is the diameter of the ellipsoidal particles) on a large surface area (similar to cm(2) range), namely, 0.65 +/- 0.12, 0.33 +/- 0.10 and 0.21 +/- 0.09. The transfer of the particle arrangements to transparent substrates was optimized through three generations, and the advantages and disadvantages of each transfer technology are discussed in detail. Such densely packed nanoparticle arrangements with high hot-spot density and tunable interparticle gaps are very beneficial for SERS applications, as demonstrated with two practical examples. The substrate-based enhancement factor of the nanocomposites was determined experimentally using a DNA monolayer and was found to be between 4 x 10(4) and 2 x 10(6) for the different particle arrangements. We also determined the sensing characteristics of a small dye molecule, rhodamine 6G (R6G). By optimizing the experimental conditions (e.g., optimizing the laser power and the refractive index of the measurement medium with an ethylene-glycol/water mixture), concentrations as low as 10(-16) M could be detected at 633 nm excitation.
Keywords
AuNPs; nanocomposite; SERS; DNA; R6G
Authors
ZANGANA, S.; LEDNICKÝ, T.; BONYÁR, A.
Released
1. 4. 2023
Publisher
MDPI
Location
BASEL
ISBN
2227-9040
Periodical
Chemosensors
Year of study
11
Number
4
State
Swiss Confederation
Pages from
1
Pages to
14
Pages count
URL
https://www.mdpi.com/2227-9040/11/4/235
Full text in the Digital Library
http://hdl.handle.net/11012/213689
BibTex
@article{BUT184132, author="Shereen {Zangana} and Tomáš {Lednický} and Attila {Bonyár}", title="Three Generations of Surface Nanocomposites Based on Hexagonally Ordered Gold Nanoparticle Layers and Their Application for Surface-Enhanced Raman Spectroscopy", journal="Chemosensors", year="2023", volume="11", number="4", pages="14", doi="10.3390/chemosensors11040235", issn="2227-9040", url="https://www.mdpi.com/2227-9040/11/4/235" }