Reproducible SERS substrates manipulated by interparticle spacing and particle diameter of gold nano-island array using in-situ thermal evaporation

Yang, Ming-Chien; Chien, Ting-Ying; Cheng, Yuanna; Hsieh, Cheng‐Chih; Syu, Wei-Lin; Wang, Kuan-Syun; Chen, Yun-Chu; Chen, Jeng-Shiung; Chen, Cheng-Cheung; Liu, Ting Yu

doi:10.1016/j.saa.2023.123190

Cited by 6 publications

(6 citation statements)

References 28 publications

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“…The SEM image demonstrates the characteristic morphology of a thin metallic layer on a Si substrate, filled with numerous narrow gaps interspersed between the particles. These gaps are potential hot spots where Raman spectra can be significantly amplified. , We observed a strong fluorescence background using a 532 nm excitation laser (Figure S1 in the Supporting Information). To tackle this issue, we switched to using a 785 nm excitation laser in our study.…”

Section: Results and Discussionmentioning

confidence: 94%

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In Situ Surface-Enhanced Raman Spectroscopy on Organic Mixed Ionic-Electronic Conductors: Tracking Dynamic Doping in Light-Emitting Electrochemical Cells

Jafari,

Pedersen,

Barhemat

et al. 2024

ACS Appl. Mater. Interfaces

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In the domain of organic mixed ionic−electronic conductors (OMIECs), simultaneous transport and coupling of ionic and electronic charges are crucial for the function of electrochemical devices in organic electronics. Understanding conduction mechanisms and chemical reactions in operational devices is pivotal for performance enhancement and is necessary for the informed and systematic development of more promising materials. Surface-enhanced Raman spectroscopy (SERS) is a potent tool for monitoring electrochemical evolution and dynamic doping in operational devices, offering enhanced sensitivity to subtle spectral changes. We demonstrate the utility of SERS for in situ tracking of doping in OMIECs in an organic light-emitting electrochemical cell (LEC) containing a conjugated polymer (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]; MEH-PPV), a molecular anion (lithium triflate), and an electrolyte network (poly(ethylene oxide); PEO). SERS enhancement is achieved via an interleaved layer of gold particles formed by spontaneous breakup of a deposited thin gold film. The results successfully highlight the ability of SERS to unveil time-resolved MEH-PPV doping and polaron formation, elucidating the effects of triflate ion transfer in the operating device and validating the electrochemical doping model in LECs.

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Section: Results and Discussionmentioning

confidence: 94%

“…These gaps are potential hot spots where Raman spectra can be significantly amplified. 50 , 51 We observed a strong fluorescence background using a 532 nm excitation laser ( Figure S1 in the Supporting Information ). To tackle this issue, we switched to using a 785 nm excitation laser in our study.…”

Section: Results and Discussionmentioning

confidence: 99%

In Situ Surface-Enhanced Raman Spectroscopy on Organic Mixed Ionic-Electronic Conductors: Tracking Dynamic Doping in Light-Emitting Electrochemical Cells

Jafari,

Pedersen,

Barhemat

et al. 2024

ACS Appl. Mater. Interfaces

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“…The Raman signal enhancement of probe molecules in the AuNPs/PDMS substrate can be explained by the electromagnetic mechanism of the SERS signal enhancement. The electromagnetic enhancement (EM) arises from the phenomenon of localized surface plasmon resonance (LSPR) excitation on the noble metal nanostructures. , The physical enhancement mechanism is elucidated by FDTD simulations of the electric field enhancement in an array of AuNPs loaded with bowl-shaped and planar PDMS, as shown in Figure . The detailed simulation framework and parameters can be found in Figure S12. , Figure a corresponds to the electric field enhancement at the cross-sectional position of the AuNPs/PDMS structure.…”

Section: Resultsmentioning

confidence: 99%

“…The detailed simulation framework and parameters can be found in Figure S12. 36,38 Figure 7a corresponds to the electric field enhancement at the cross-sectional position of the AuNPs/PDMS structure. It can be seen that the electric field intensity at the bottom of the bowl-shaped PDMS is significantly higher than at other positions, and there is an electric field enhancement at the center of the bowl.…”

Section: Factorsmentioning

confidence: 99%

“…The electromagnetic enhancement (EM) arises from the phenomenon of localized surface plasmon resonance (LSPR) excitation on the noble metal nanostructures. 36,37 The physical enhancement mechanism is elucidated by FDTD simulations of the electric field enhancement in an array of AuNPs loaded with bowl-shaped and planar PDMS, as shown in Figure 7. The detailed simulation framework and parameters can be found in Figure S12.…”

Section: Factorsmentioning

confidence: 99%

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Flexible Large-Area Surface Enhanced Raman Scattering Substrate Based on Bowl-Shaped Arrays of Au Nanoparticles on PDMS

Mi,

Yuan,

Hao

et al. 2024

ACS Appl. Nano Mater.

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Surface enhanced Raman scattering (SERS) is a technique that utilizes the surface electric field of metal nanostructures to amplify Raman signals and promote the analysis and detection of trace molecules. In order to harness the potential of flexible SERS substrates, this work proposes a simple and cost-effective method for preparing a large-area (circular, 7.5 cm in diameter, with a 38 cm 2 area) three-dimensional (3D) flexible SERS substrate. We first prepared a bowl-shaped nanoarray of polydimethylsiloxane (PDMS) by utilizing a polystyrene microsphere (PS) as sacrificial templates and then loaded a monolayer of gold nanoparticles (AuNPs) on it, finally a high-strength 3D AuNPs/PDMS flexible SERS substrate is obtained successfully. There are two key steps here, which are using plasma etching to regulate the gap between PS spheres and using the thermal demolding method to facilitate the separation of PS and PDMS. The ultralarge area AuNPs/PDMS substrate exhibits high SERS detection sensitivity and good uniformity. The SERS substrate possesses the advantage of multifunctional detection. The proposed substrate demonstrated detections of up to 10 −9 , 10 −7 , and 10 −8 M concentrations of rhodamine 6G (R6G), vitamin C, and thiram molecules, respectively. The detection results meet international standards. Electromagnetic simulations using the finite difference time domain reveal that the SERS enhancement originates from the surface plasmon resonance and coupling effects of AuNPs. This large-area 3D flexible SERS substrate not only enhances detection efficiency by enabling the detection of a greater number of samples or sample regions but also provides a new approach for detecting vitamin C and pesticide residues. It may also be used in electronic skin sensors, in situ pesticide residue detection, on-scene evidence collection in criminal investigations, and so on.

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Surface-Enhanced Raman Spectroscopy (SERS)-Based Sensors: Pioneering Technique for Future Environmental Remediation

Shameer,

Anand,

Parambath

et al. 2024

Plasmonics

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Reproducible SERS substrates manipulated by interparticle spacing and particle diameter of gold nano-island array using in-situ thermal evaporation

Cited by 6 publications

References 28 publications

In Situ Surface-Enhanced Raman Spectroscopy on Organic Mixed Ionic-Electronic Conductors: Tracking Dynamic Doping in Light-Emitting Electrochemical Cells

In Situ Surface-Enhanced Raman Spectroscopy on Organic Mixed Ionic-Electronic Conductors: Tracking Dynamic Doping in Light-Emitting Electrochemical Cells

Flexible Large-Area Surface Enhanced Raman Scattering Substrate Based on Bowl-Shaped Arrays of Au Nanoparticles on PDMS

Surface-Enhanced Raman Spectroscopy (SERS)-Based Sensors: Pioneering Technique for Future Environmental Remediation

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