Flexing Piezoelectric Diphenylalanine–Plasmonic Metal Nanocomposites to Increase SERS Signal Strength

Almohammed, Sawsan; Fularz, Agata; Zhang, Fengyuan; Alvarez-Ruiz, Diana; Bello, Frank; O’Regan, David D.; Rodriguez, Brian J.; Rice, James H.

doi:10.1021/acsami.0c15498

Cited by 28 publications

(31 citation statements)

References 43 publications

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“…In the optical absorption spectrum (Figure c) for the AgNPs alone it can be seen that the LSPR is located at ∼420 nm (full width at half-maximum (fwhm) of ∼45 nm). The absorption spectrum for FFNTs alone shows absorption peaks at ∼222 and ∼260 nm (Figure c), in agreement with previous reports. , When FFNT is combined with AgNP, the metal LSPR feature is red-shifted by ∼16 nm (to ∼435 nm) and its fwhm narrowed by ∼15 nm (to ∼30 nm) (Figure c). This red shift and reduction in fwhm for the LSPR band of the metal nanoparticle has been reported to arise from the peptide amino acid carboxyl groups binding to metal NPs. ,, The application of a DC electric field on the microfabricated chip device in air results in further shifts of the LSPR (∼20 nm shift) and broadening.…”

Section: Resultssupporting

confidence: 91%

“…The absorption spectrum for FFNTs alone shows absorption peaks at ∼222 and ∼260 nm ( Figure 1 c), in agreement with previous reports. 36 , 37 When FFNT is combined with AgNP, the metal LSPR feature is red-shifted by ∼16 nm (to ∼435 nm) and its fwhm narrowed by ∼15 nm (to ∼30 nm) ( Figure 1 c). This red shift and reduction in fwhm for the LSPR band of the metal nanoparticle has been reported to arise from the peptide amino acid carboxyl groups binding to metal NPs.…”

Section: Resultsmentioning

confidence: 99%

“…Metal NPs are easily oxidized in air, resulting in the lowering of both signal activity and signal reproducibility. FFNTs can passivate NPs and protect them from being oxidized at elevated temperatures due to the thermal and chemical stability of the FFNTs . Additionally, when only NPs are used, the PEF intensity does not return to its initial value during the relaxation period (after the electric field is turned off), suggesting that the presence of the FFNTs in the microfabricated chip is essential to preserve the signal integrity while both the electric field and high-power (∼60 mW) illumination are applied (Figure S11).…”

Section: Resultsmentioning

confidence: 99%

“…Also, FFNTs have been reported to have the ability to bind with metal ions residing at a specific location that led to a red shift in absorption spectra. We have reported the effectiveness and working principle of these composites in our previous publications. ,,,, Following this, 40 μL of the composite materials was then placed on the microfabricated chip to create the aligned FFNT–AgNP template on the SiO 2 layer formed by UV/ozone. For the control sample, 60 μL of AgNPs (0.02 mg/mL) was drop-casted on a Si substrate.…”

Section: Materials and Methodsmentioning

confidence: 99%

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Electric Field Tunability of Photoluminescence from a Hybrid Peptide–Plasmonic Metal Microfabricated Chip

Almohammed

Orhan

Daly

et al. 2021

JACS Au

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Enhancement of fluorescence through the application of plasmonic metal nanostructures has gained substantial research attention due to the widespread use of fluorescence-based measurements and devices. Using a microfabricated plasmonic silver nanoparticle–organic semiconductor platform, we show experimentally the enhancement of fluorescence intensity achieved through electro-optical synergy. Fluorophores located sufficiently near silver nanoparticles are combined with diphenylalanine nanotubes (FFNTs) and subjected to a DC electric field. It is proposed that the enhancement of the fluorescence signal arises from the application of the electric field along the length of the FFNTs, which stimulates the pairing of low-energy electrons in the FFNTs with the silver nanoparticles, enabling charge transport across the metal–semiconductor template that enhances the electromagnetic field of the plasmonic nanoparticles. Many-body perturbation theory calculations indicate that, furthermore, the charging of silver may enhance its plasmonic performance intrinsically at particular wavelengths, through band-structure effects. These studies demonstrate for the first time that field-activated plasmonic hybrid platforms can improve fluorescence-based detection beyond using plasmonic nanoparticles alone. In order to widen the use of this hybrid platform, we have applied it to enhance fluorescence from bovine serum albumin and Pseudomonas fluorescens . Significant enhancement in fluorescence intensity was observed from both. The results obtained can provide a reference to be used in the development of biochemical sensors based on surface-enhanced fluorescence.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Materials and Methodsmentioning

confidence: 99%

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Electric Field Tunability of Photoluminescence from a Hybrid Peptide–Plasmonic Metal Microfabricated Chip

Almohammed

Orhan

Daly

et al. 2021

JACS Au

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“…Preliminary experiments show that the QWs, with modified band gaps and metal nanoparticles, are also effective in the SERS sensing of deoxyribonucleic acid (DNA) and glucose (Figures S8 in the Supporting Information). The detection of these two molecules is crucial in disease diagnoses and biopharmaceutical manufacturing. ,− The detailed characterization results of the analytes other than R6G will be published in our future reports.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured InGaN Quantum Wells as a Surface-Enhanced Raman Scattering Substrate with Expanded Hot Spots

Chien

Zhang

Chen

et al. 2021

ACS Appl. Nano Mater.

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Surface-enhanced Raman scattering (SERS) is a technique that can deliver label-free, real-time, and multiplex detection of target molecules. However, the development of this potential tool has been impeded by an obstacle: reliability. Because SERS detection relies on the very localized (< 10 nm) hot spot, severe intensity fluctuation occurs as the molecule thermally diffuses in and out of the tiny spot, making it difficult to quantify the information of analytes. Here, we address the problem by greatly expanding the effective area of a hot spot. The breakthrough is realized by a few layers of conformally nanostructured InGaN, which introduce wafer-scale charge coupling at the molecule/metal/semiconductor interface. These additional coupling channels interconnect plasmonic nanojunctions, rendering the SERS-active surface spreading over 1200 μm2 in Raman mapping. The result allows us to capture trace molecules with increased chances and stabilized signals, paving a way for SERS to enter real-life applications.

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Recent Advances and Perspective in Electrically Regulated Surface‐Enhanced Raman Spectroscopy

Ji,

Tan,

Pei

et al. 2023

Advanced Photonics Research

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Surface‐enhanced Raman spectroscopy (SERS) has emerged as a distinctive fingerprinting technique, offering a broad spectrum of applications encompassing environmental monitoring, chemical detection, and biomolecular analysis. Electrically modulated SERS (E‐SERS) stands as a technique which leverages an electric field to finely control the Raman signal based on the foundational principles of SERS. Through the manipulation of the physicochemical attributes of a metal or 2D material substrate, E‐SERS brings about an enhancement of the SERS signal. This enhancement occurs through a charge transfer process and modulation of the plasma resonance. This article showcases recent strides in the domain of E‐SERS, encompassing advancements such as the integration of paired integrated electrodes, piezoelectric materials, and pyroelectric materials in the construction of substrates. An exhaustive analysis of the mechanism underpinning the enhancement of the Raman signal is undertaken, alongside an exploration of the prominent attributes characterizing diverse methods for conditioning Raman signals. Elucidations are provided on the significance of employed electric fields in the augmentation of SERS and their manifold applications in drug identification, chemical detection, and catalysis. In summation, a delineation of challenges and perspectives inherent to E‐SERS substrates is presented, delineating a path for prospective comprehensive exploration within this auspicious realm of research.

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Flexing Piezoelectric Diphenylalanine–Plasmonic Metal Nanocomposites to Increase SERS Signal Strength

Cited by 28 publications

References 43 publications

Electric Field Tunability of Photoluminescence from a Hybrid Peptide–Plasmonic Metal Microfabricated Chip

Electric Field Tunability of Photoluminescence from a Hybrid Peptide–Plasmonic Metal Microfabricated Chip

Nanostructured InGaN Quantum Wells as a Surface-Enhanced Raman Scattering Substrate with Expanded Hot Spots

Recent Advances and Perspective in Electrically Regulated Surface‐Enhanced Raman Spectroscopy

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