Effect of the Combination of Gold Nanoparticles and Polyelectrolyte Layers on SERS Measurements

Nucera, Antonello; Grillo, Rossella; Rizzuto, Carmen; Barberi, R.; Castriota, Marco; Bürgi, Thomas; Caputo, Roberto; Palermo, Giovanna

doi:10.3390/bios12100895

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…Raman spectroscopy has been widely used for studying many kinds of systems, such as: semiconductors, polymeric gel, phthalocyanine films, carbon-based systems (graphene and nanotubes), biopolymers, biomimetic biological systems and so on [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

2023

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In this work, the implementation of an electrochromic device (10 cm × 10 cm in size) for energy saving applications has been presented. As electrochromic system has been used with an electrochromic solution (ECsol) made by ethyl viologen diperchlorate [EV(ClO4)2], 1,1′-diethyl ferrocene (DEFc) and propylene carbonate (PC), as solvent. The final system has been obtained by mixing the ECsol, described above, with a polymeric system made by Bisphenol-A glycerolate (1 glycerol/phenol) diacrylate (BPA) and 2,2-Dimethoxy-2-phenylacetophenone (Irgacure 651) in a weight percentage equal to 60:40% w/w, respectively. Lithography has been used to make a spacer pattern with a thickness of about 15–20 µm between the two substrates. Micro-Raman spectroscopy confirmed the presence of the EV•+ as justified by the blue color of the electrochromic device in the ON state. Electrochemical and optical properties of the electrochromic device have been studied. The device shows reversible electrochromic behavior as confirmed by cyclic color variation due to the reduction and oxidation process of the EV2+/EV•+ couple. The electrochromic device shows a variation of the % transmittance in the visible region at 400 nm of 59.6% in the OFF state and 0.48% at 3.0 V. At 606 nm the transmittance in the bleached state is 84.58% in the OFF state and then decreases to 1.01% when it is fully colored at 3.0 V. In the NIR region at 890 nm, the device shows a transmittance of 74.3% in the OFF state and 23.7% at 3.0 V while at 1165 nm the values of the transmittance changed from 83.21% in the OFF state to 1.58% in the ON state at 3.0 V. The electrochromic device shows high values of CCR% and exhibits excellent values of CE in both visible and near-infrared regions when switched between OFF/ON states. In the NIR region at 890 nm, electrochromic devices can be used for the energy-saving of buildings with a promising CE of 120.9 cm2/C and 420.1 cm2/C at 1165 nm.

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Section: Resultsmentioning

confidence: 99%

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

2023

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“…Two mechanisms were proposed for the observed enhancement: the first is the electromagnetic effect based on the excitation of localized surface plasmons, while the second is explained by the chemical theory of the charge-transfer complex . Substrates exhibiting SERS are commonly used for the identification of proteins, biomolecules, and chemical species including, for example, BTEX, VOCs, heavy metals, pesticides, − and many others. − …”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Spectroscopy on an As-deposited Fano Resonance Multilayer Substrate

et al. 2023

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In this work, we exploit the use of non-patterned multilayer thin films as substrates for surface-enhanced Raman spectroscopy (SERS) investigation. An appropriate selection of materials and thickness allows obtaining Fano resonance exhibiting high peak reflection at the same working wavelength of SERS apparatus. The proposed system is constituted by Ti/Ag/ZnO/Ag/Ti deposited on a glass substrate by a sputtering technique. The SERS effect provided by the Fano resonance was investigated by micro-Raman spectroscopy through the analysis of solutions of lithium perchlorate in propylene carbonate at salt concentrations of 0.1, 0.5, 1.0, and 2.0 M and compared to a reference substrate (glass substrate) with an average enhancement of all the bands around 3. The high flexibility in obtaining easily different resonance wavelengths combined with low cost and large area fabrication technology represents the main advantage of the proposed multilayer system for SERS investigation.

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“…Surface-enhanced Raman spectroscopy (SERS) relies mainly on the local electric field (LEF) hotspots produced by surface plasmons in a noble metallic nanostructure to enhance the weak Raman scattering signal [1][2][3][4]. Thus, rational design and manufacturing of SERS substrates are very important for obtaining SERS signals with excellent sensitivity, uniformity, and reproducibility [5][6][7][8]. Noble metal nanoparticle arrays support high-quality plasmon resonance, which can greatly enhance the LEF intensity at nanogaps, and provide high Raman enhancement factors (EF), thus attracting widespread attention [3,9].…”

Section: Introductionmentioning

confidence: 99%

Optimized Design and Preparation of Ag Nanoparticle Multilayer SERS Substrates with Excellent Sensing Performance

Wen

Yang

Hu³

et al. 2022

Biosensors

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Nanoparticle multilayer substrates usually exhibit excellent SERS activity due to multi-dimensional plasmon coupling. However, simply increasing the layers will lead to several problems, such as complex manufacturing procedures, reduced uniformity and poor reproducibility. In this paper, the local electric field (LEF) characteristics of a Ag nanoparticle (AgNP) multilayer were systematically studied through finite element simulations. We found that, on the glass support, the LEF intensity improved with the increase in the layers of AgNPs. However, the maximum LEF could be obtained with only two layers of AgNPs on the Au film support, and it was much stronger than the optimal value of the former. To verify the simulation results, we have successfully prepared one to four layers of AgNPs on both supports with a liquid–liquid interface self-assembly method, and carried out a series of SERS measurements. The experimental results were in good agreement with the simulations. Finally, the optimized SERS substrate, the 2-AgNP@Au film, showed an ultra-high SERS sensitivity, along with an excellent signal uniformity, which had a detection ability of 1 × 10−15 M for the Rhodamine 6G (R6G) and a relative standard deviation (RSD) of 11% for the signal intensity. Our study provides important theoretical guidance and a technical basis for the optimized design and application of high-performance SERS substrates.

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Effect of the Combination of Gold Nanoparticles and Polyelectrolyte Layers on SERS Measurements

Cited by 4 publications

References 35 publications

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

Development of Electrochromic Devices, Based on Polymeric Gel, for Energy Saving Applications

Surface-Enhanced Raman Spectroscopy on an As-deposited Fano Resonance Multilayer Substrate

Optimized Design and Preparation of Ag Nanoparticle Multilayer SERS Substrates with Excellent Sensing Performance

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