Investigation of organic monoradicals reactivity using surface-enhanced Raman spectroscopy

Gutowski, Łukasz; Liszewska, Malwina; Bartosewicz, Bartosz; Budner, Bogusław; Weyher, J.L.; Jankiewicz, Bartłomiej J.

doi:10.1016/j.saa.2022.121312

Cited by 3 publications

(3 citation statements)

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“…The thickness of Ag layers deposited on GaN platforms by MS was determined by the deposition time ( Table 1 ). In the standard procedure developed in previous studies [ 28 – 36 ], a plasmonic metal layer is deposited for 280 s, forming a Ag layer with approximately 423 ± 5 nm thickness on a flat Si surface. In our studies, plasmonic metal was additionally deposited using one shorter and two longer deposition times to obtain GaN/Ag substrates with thinner and thicker Ag layers.…”

Section: Resultsmentioning

confidence: 99%

“…The nanostructured GaN platforms can then be coated with Au [ 26 , 28 ], Ag [ 25 ], AuCu, or AuAg alloys [ 24 , 29 – 32 ] to produce highly reproducible and efficient SERS substrates. GaN-based SERS substrates have been used so far for trace detection of explosive materials [ 33 ], fentanyl and bacterial spores’ analysis [ 31 ], gene mutation identification [ 34 – 35 ], and investigations of the reactivity of organic monoradicals [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

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SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms

Zając¹,

Budner²,

Liszewska³

et al. 2023

Beilstein J. Nanotechnol.

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The results of comparative studies on the fabrication and characterization of GaN/Ag substrates using pulsed laser deposition (PLD) and magnetron sputtering (MS) and their evaluation as potential substrates for surface-enhanced Raman spectroscopy (SERS) are reported. Ag layers of comparable thicknesses were deposited using PLD and MS on nanostructured GaN platforms. All fabricated SERS substrates were examined regarding their optical properties using UV–vis spectroscopy and regarding their morphology using scanning electron microscopy. SERS properties of the fabricated GaN/Ag substrates were evaluated by measuring SERS spectra of 4-mercaptobenzoic acid molecules adsorbed on them. For all PLD-made GaN/Ag substrates, the estimated enhancement factors were higher than for MS-made substrates with a comparable thickness of the Ag layer. In the best case, the PLD-made GaN/Ag substrate exhibited an approximately 4.4 times higher enhancement factor than the best MS-made substrate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms

Zając¹,

Budner²,

Liszewska³

et al. 2023

Beilstein J. Nanotechnol.

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“…Surface-enhanced Raman spectroscopy (SERS) provides detailed molecular-level information on the bonding, orientation, and structure of surface-adsorbed molecules in situ [ 24 , 25 , 26 , 27 , 28 , 29 ]. However, SERS is restricted by the necessity to use corrugated noble metal surfaces.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy of Imidazole Ring Functionalized Monolayer on Smooth Gold Electrode

et al. 2022

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The imidazole ring (Im) of histidine side chains plays a unique role in the function of proteins through covalent bonding with metal ions and hydrogen bonding interactions with adjusted biomolecules and water. At biological interfaces, these interactions are modified because of the presence of an electric field. Self-assembled monolayers (SAMs) with the functional Im group mimic the histidine side chain at electrified interfaces. In this study, we applied in-situ shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) to probe the structure and hydrogen bonding of Im-functionalized SAM on smooth Au at the electrochemical interface. The self-assembly of molecules on the Au induced the proton shift from N1 atom (Tautomer-I), which is the dominant form of Im in the bulk sample, to N3 atom (Tautomer-II). The impact of electrode potential on the hydrogen bonding interaction strength of the Im ring was identified by SHINERS. Temperature-Raman measurements and density functional theory (DFT) analysis revealed the spectral marker for Im ring packing (mode near 1496–1480 cm−1) that allowed us to associate the confined and strongly hydrogen bonded interfacial Im groups with electrode polarization at −0.8 V. Reflection adsorption IR (RAIR) spectra of SAMs with and without Im revealed that the bulky ring prevented the formation of a strongly hydrogen bonded amide group network.

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