Controlling the Electron Concentration for Surface-Enhanced Raman Spectroscopy

Nguyen, Thi Anh Nguyet; Yu, Ying Lung; Chang, Ya Chien; Wang, Yu Han; Woon, Wei Yen; Wu, Chien Ting; Lin, Kuei-Huei; Liu, Cheng Yi; Chien, Fan Ching; Lai, K. Robert

doi:10.1021/acsphotonics.1c00611

Cited by 7 publications

(1 citation statement)

References 35 publications

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“…Besides, the molecular polarizability would change by charge-transfer and could enlarge the intrinsic Raman cross sections of the metal–molecule or semiconductor–molecule complex, which is beneficial for the detection of molecules with small scattering cross-section. Many reports have proposed that the combination of metallic NPs with semiconductors would make the charge transfer from the metallic NPs to the semiconductor under photoexcitation. − However, the additional enhancements are impressively small and have little effect on the total SERS signal compared with the metallic NPs alone.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Field-Assisted Raman Scattering and Photocatalysis with GaN-Plasmonic Metal Composites

Tan

et al. 2022

ACS Photonics

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The combination of metallic nanoparticles (NPs) with semiconductors used as surface-enhanced Raman scattering (SERS) substrates have been widely reported. However, the additional enhancements provided by the semiconductors are impressively small and have little effect on the SERS signal compared with that from the metallic NPs alone. Herein, thermoelectric semiconductor material gallium nitride (GaN) and silver nanoparticles (Ag NPs) are combined to create an electric-field-induced SERS (E-SERS) substrate, which further improves the SERS signal intensity by an order of magnitude compared to that without electric field induction. Based on the chemical enhancement induced by the thermoelectric potential, the presented E-SERS substrate realizes the detection over a broad kind of molecules, even with small Raman scattering cross sections.We show that the thermoelectric potential could regulate the charge exchange between GaN and Ag NPs and then shift the Fermi level of the Ag NPs over a wide-ranging distribution, which could increase the resonant electron transition probabilities with the detected molecules. Furthermore, the E-SERS substrate is also realized to monitor and manipulate the plasmon-activated redox reactions. Based on the finite element calculations, a detailed and comprehensive theoretical analysis is conducted to deepen the understanding of the chemical SERS and plasmon-activated photocatalyst mechanism.

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Section: Introductionmentioning

confidence: 99%

Thermoelectric Field-Assisted Raman Scattering and Photocatalysis with GaN-Plasmonic Metal Composites

Tan

et al. 2022

ACS Photonics

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Catching Single Molecules with Plasmonic InGaN Quantum Dots

Zhao

Nguyen

Tsai

et al. 2023

Advanced Optical Materials

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Single molecules are elusive and often produce misleading signals. Surface‐enhanced Raman spectroscopy (SERS) is one of the few techniques capable of verifying the presence of single molecules. To achieve the goal, the bianalyte proof is favored by researchers as it relies on the statistical analysis of thousands of spectra, rather than the fluctuating signals observed at limited spots. Since the hotspot of SERS is extremely small (<10 nm), less than 1% of the adsorbed molecules can deliver boosted Raman intensities, making the capture of single molecules a rare event. Here, the proof with single‐molecule signals covering 89.6% of the scanned spots is presented. This is achieved by plasmonically coupling subsurface InGaN quantum dots (QDs) to every Au nanoparticle on the SERS substrate. The QD‐Au complexes extend the plasmonic fields far away from the metallic nanojunction, redefining the bianalyte rule for single‐molecule detection.

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Realizing Square-Ordered Nanopillars with a 0.1-Tera-Density through a Superimposed Masking Strategy for Advanced Surface-Enhanced Raman Spectroscopy

Lee,

Ku,

Lim

et al. 2024

ACS Appl. Mater. Interfaces

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Despite widespread interest in nanoscale pillar structures for various optical devices, including solar cells, photonic crystal lasers, and sensors, the critical challenges for mass production are the high equipment costs and limited scalability of traditional manufacturing methods. To overcome these hurdles, this study develops a simple and highly scalable etch-mask superposition technique based on thermally assisted nanotransfer printing (T-nTP) of Cr line patterns. The orthogonal superposition of linear Cr mask patterns creates double-height cross-point arrays that effectively and selectively protect the underlying SiO 2 during subsequent reactive ion etching. This process generates highly uniform nanoscale pillar arrays with an extremely high density of 0.1 terapillars per square inch, eliminating the need for high-cost patterning platforms. As an exemplary application, we demonstrate the use of these perfectly ordered nanopillar arrays as high-performance surface-enhanced Raman scattering (SERS) sensors through the deposition of noble metal films on the nanopillar surface. These nanopillars enable exceptionally uniform SERS intensity with spot variations of less than 7% in methylene blue (MB) measurements. Additionally, they exhibit sensitive detections and accurate quantification for thiabendazole (TBZ) at concentrations as low as 10 −8 M, along with multicycle reusability without noticeable degradation, owing to the outstanding robustness of the SiO 2 nanopillars.

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Controlling the Electron Concentration for Surface-Enhanced Raman Spectroscopy

Cited by 7 publications

References 35 publications

Thermoelectric Field-Assisted Raman Scattering and Photocatalysis with GaN-Plasmonic Metal Composites

Thermoelectric Field-Assisted Raman Scattering and Photocatalysis with GaN-Plasmonic Metal Composites

Catching Single Molecules with Plasmonic InGaN Quantum Dots

Realizing Square-Ordered Nanopillars with a 0.1-Tera-Density through a Superimposed Masking Strategy for Advanced Surface-Enhanced Raman Spectroscopy

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