Szczegóły publikacji
Opis bibliograficzny
Exploring the nanoscale: AFM-IR visualization of cysteine adsorption on gold nanoparticles / Dominika ŚWIĘCH, Kamila KOLLBEK, Piotr JABŁOŃSKI, Marta GAJEWSKA, Gaetano PALUMBO, Magdalena Oćwieja, Natalia Piergies // Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy ; ISSN 1386-1425. — 2024 — vol. 318 art. no. 124433, s. 1–9. — Bibliogr. s. 8–9, Abstr. — Publikacja dostępna online od: 2024-05-09
Autorzy (7)
- AGHŚwięch Dominika
- AGHKollbek Kamila
- AGHJabłoński Piotr
- AGHGajewska Marta
- AGHPalumbo Gaetano
- Oćwieja Magdalena
- Piergies Natalia
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 153619 |
|---|---|
| Data dodania do BaDAP | 2024-06-23 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.saa.2024.124433 |
| Rok publikacji | 2024 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Spectrochimica Acta, Part A, Molecular and Biomolecular Spectroscopy |
Abstract
This study focuses on the adsorption process of L-cysteine (Cys), a sulfur-containing amino acid, onto monolayers of gold nanoparticles (AuNPs) prepared through distinct protocols on mica substrates. Two types of AuNPs were prepared using two different methods: the first employed a physical approach, which combined the Inert Gas Condensation (IGC) technique with the magnetron sputtering method, while the second utilized a chemical method involving the reduction of tetrachloroauric acid with trisodium citrate (TC). The characterization of AuNPs was performed using transmission electron microscopy (TEM) and atomic force microscopy (AFM), of up to 5 ± 1.3 nm for bare AuNPs obtained through vacuum techniques, and up to 12 ± 5 nm for negatively charged, citrate-stabilized TCAuNPs(−). The application of spectroscopic techniques based on the surface-enhanced effects allows for describing the adsorption process in both micro- and nanoscale systems: Cys/bare AuNPs and Cys/ TCAuNPs(−). The commonly used surface-enhanced Raman spectroscopy (SERS) technique provided insights into adsorption behaviours at the microscale level. In the case of TCAuNPs(−), an interaction involving the lone electron pair of sulfur (S) atom and metal surface, while on the bare AuNPs, S is adsorbed on the surface, but the cleavage of the SH group is not discernible. Nanoscale analysis was complemented using AFM combined with the surface-enhanced infrared absorption spectroscopy (AFM-SEIRA) technique. AFM-SEIRA map indicated the formation of hot spot which were predominantly located between aggregated TCAuNPs(−) and on specific NPs surfaces (area between NPs and gold-coated tip). Results from the SERS and AFM-SEIRA techniques were in good agreement, underscoring the comprehensive understanding achieved through the chosen experimental approach regarding the Cys interactions with layers of AuNPs.
