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| Open AccessGeneral approach to surface-accessible plasmonic Pickering emulsions for SERS sensing and interfacial catalysis
The preparation of Pickering emulsions from nanoparticles commonly requires modification of the particles’ surface chemistry. Here, the authors demonstrate a chemical modifier-free approach for the preparation of long-term stable Pickering emulsions for SERS sensing and catalytic applications.
- Yingrui Zhang
- , Ziwei Ye
- & Yikai Xu
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| Open AccessThree-dimensional nanoframes with dual rims as nanoprobes for biosensing
Most SERS-active nanostructures suffer from low robustness against misalignment to field polarization. Here, the authors demonstrate three-dimensional nanoframes of octahedral geometry, with two rims engraved on each facet, as polarization-independent SERS nanoprobes.
- Hajir Hilal
- , Qiang Zhao
- & Sungho Park
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| Open AccessPorous carbon nanowire array for surface-enhanced Raman spectroscopy
SERS can be unreliable for biomedical use. The authors demonstrate a metal-free nanostructure composed of porous carbon nanowires in an array as a SERS substrate. It offers 106 signal enhancement due to strong broadband charge-transfer resonance and substrate-to-substrate, spot-to-spot and time-to-time consistency in the SERS spectrum.
- Nan Chen
- , Ting-Hui Xiao
- & Keisuke Goda
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| Open AccessSurface enhanced Raman scattering artificial nose for high dimensionality fingerprinting
Label-free surface-enhanced Raman spectroscopy is an emergent method for the detection and discrimination of biological analytes. Here, the authors describe SERS sensors with arrayed mildly-selective surface chemistries to give a fingerprint based on different interactions for analysing biological samples.
- Nayoung Kim
- , Michael R. Thomas
- & Molly M. Stevens
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| Open AccessPlasmon-enhanced stimulated Raman scattering microscopy with single-molecule detection sensitivity
Stimulated Raman scattering (SRS) microscopy enables label-free chemical imaging at high speed, but has been limited by low sensitivity. Here, the authors demonstrate plasmon-enhanced SRS microscopy and achieve single molecule detection sensitivity.
- Cheng Zong
- , Ranjith Premasiri
- & Ji-Xin Cheng
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| Open AccessEnhanced photocatalysis and biomolecular sensing with field-activated nanotube-nanoparticle templates
Plasmonic nanomaterials offer new frontiers as photocatalysis and sensor materials, yet elucidating factors controlling each is a challenge. Here, authors examine the role of electric fields in photocatalysis and biomolecule sensing abilities of peptide-nanotubesupported silver nanoparticles.
- Sawsan Almohammed
- , Sebastian Tade Barwich
- & James H. Rice
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| Open AccessCreating two self-assembly micro-environments to achieve supercrystals with dual structures using polyhedral nanoparticles
Crystals with multiple structures often perform special functions in nature, inspiring the creation of synthetic analogues. Here, the authors subject polyhedral nanoparticles to two self-assembly micro-environments to realize supercrystals with dual structures, in which the order of the surface layer differs from the bulk structure.
- Yih Hong Lee
- , Chee Leng Lay
- & Xing Yi Ling
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| Open AccessRaman enhancement on ultra-clean graphene quantum dots produced by quasi-equilibrium plasma-enhanced chemical vapor deposition
Surface-enhanced Raman spectroscopy (SERS) is a promising technology for sensitive optical sensors, generally using rough metal films. Here, Liu et al. synthesize high-quality graphene quantum dot films which offer a large SERS enhancement due to a strong light-matter interaction with Van Hove singularities.
- Donghua Liu
- , Xiaosong Chen
- & Dacheng Wei
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| Open AccessIn situ dynamic tracking of heterogeneous nanocatalytic processes by shell-isolated nanoparticle-enhanced Raman spectroscopy
Rational design of heterogeneous catalysts requires molecular understanding of catalytic processes. Here, the authors attach PtFe and Pd nanocatalysts to Raman signal-enhancing Au-silica nanoparticles, allowing them to spectroscopically observe the active species and bonds involved in CO oxidation in real time.
- Hua Zhang
- , Chen Wang
- & Zhong-Qun Tian
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| Open AccessPlasmonic photoluminescence for recovering native chemical information from surface-enhanced Raman scattering
Localized surface plasmon resonances induce strong modifications of surface-enhanced Raman spectra. Here the authors propose a robust method to retrieve the fingerprint of intrinsic chemical information by using the photoluminescence of the metallic structures to correct the spectra.
- Kai-Qiang Lin
- , Jun Yi
- & Bin Ren
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Article
| Open AccessHierarchical zwitterionic modification of a SERS substrate enables real-time drug monitoring in blood plasma
Despite the high sensitivity of SERS analysis, non-specific binding of proteins can impact the effectiveness in biologically important media such as blood. Here the authors report a SERS substrate modified to prevent protein fouling and demonstrate drug detection in undiluted plasma.
- Fang Sun
- , Hsiang-Chieh Hung
- & Qiuming Yu
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Article
| Open AccessIntermediate stages of electrochemical oxidation of single-crystalline platinum revealed by in situ Raman spectroscopy
Understanding degradation of platinum catalysts during oxygen reduction is vital for improving proton-exchange membrane fuel cells. Here, the authors identify intermediate stages in the oxidation of Pt(111) and Pt(100) in perchloric acid using in situshell-isolated nanoparticle-enhanced Raman spectroscopy.
- Yi-Fan Huang
- , Patricia J. Kooyman
- & Marc T. M. Koper
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Quantum mechanical limit to plasmonic enhancement as observed by surface-enhanced Raman scattering
Plasmonic nanostructures concentrate light into sub-wavelength volumes, enhancing its electric field. In a series of surface-enhanced Raman measurements, Zhu and Crozier show that as the structure size shrinks, quantum-mechanical electron tunnelling places a limit on the achievable enhancement.
- Wenqi Zhu
- & Kenneth B. Crozier
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Interfacial liquid-state surface-enhanced Raman spectroscopy
Assembly of functional colloidal nanoparticles has many technological applications, but its three-dimensional realization remains challenging. Kim et al.report a spontaneous self-orientation of gold nanorods at an oil/water interface and use it to amplify signal in surface-enhanced Raman spectroscopy.
- Kihoon Kim
- , Hye Soo Han
- & Taewook Kang
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| Open AccessEffective localized collection and identification of airborne species through electrodynamic precipitation and SERS-based detection
Effective collection of molecules on a small sensing area is not possible based on diffusion alone and the employment of a directed force is required. The authors report a localized electrodynamic precipitation concept to collect, spot and detect airborne species in an active-matrix array-like fashion.
- En-Chiang Lin
- , Jun Fang
- & Heiko O. Jacobs