Fundamental understanding and applications of plasmon-enhanced Raman spectroscopy

Wang, Xiang; Huang, Su-Dan; Hu, Shu; Yan, Sen; Ren, Bin

doi:10.1038/s42254-020-0171-y

Cited by 458 publications

(308 citation statements)

References 186 publications

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“…Metal nanocrystals (NCs) continue to be at the forefront of modern science and technology with their applications spanning from catalysis and energy conversion to photonics, biology and medicine. [1][2][3][4][5] Their physico-chemical properties are strongly inuenced by size, shape and composition, and thus, tailoring such features provides an effective strategy to boost their performances and broaden their applications. [1][2][3][4][5] To this aim, colloidal chemistry has been largely exploited as it enables the design of NCs with atomic-level precision, while minimizing particle polydispersity under relatively mild conditions.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] Their physico-chemical properties are strongly inuenced by size, shape and composition, and thus, tailoring such features provides an effective strategy to boost their performances and broaden their applications. [1][2][3][4][5] To this aim, colloidal chemistry has been largely exploited as it enables the design of NCs with atomic-level precision, while minimizing particle polydispersity under relatively mild conditions. [6][7][8][9][10] A huge library of noble metal NCs with a large variety of structures and a continuously increasing compositional complexity has been assembled up to now.…”

Section: Introductionmentioning

confidence: 99%

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Shaping non-noble metal nanocrystals via colloidal chemistry

2020

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shaping non-noble metal nanocrystals via colloidal chemistry

2020

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“…With the development of nanoscience and laser technology, numerous development opportunities exist for surface-enhanced Raman scattering (SERS) in interface and surface investigations and life science applications [1][2][3][4]. SERS is a surface or interfacial phenomenon that is sensitive to variations in the environment of the substrate surface.…”

Section: Introductionmentioning

confidence: 99%

Improved Charge Transfer Contribution by Cosputtering Ag and ZnO

et al. 2020

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A two-dimensional polystyrene microsphere array cosputtered with Ag and ZnO was designed for evaluating surface-enhanced Raman scattering (SERS) activity. The surface plasmon resonance (SPR) and SERS properties were significantly changed by the introduction of ZnO into the Ag film. By increasing the Ag sputtering power, a redshift of the SPR peak was obtained. Moreover, improved SERS activity occurred because of the electromagnetic (EM) contribution from the increasing Ag content and the charge transfer (CT) contribution from the introduction of ZnO. More importantly, the Hall effect was employed to evaluate the carrier density effect on the SERS contribution of the Ag/ZnO film. The increase in the carrier density as the Ag sputtering power increased indicated an increasing number of free electrons stored in the Ag/ZnO film, which was accompanied by improved EM and CT contributions.

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“…In the past decades, many works reported impressive enhancement factors in surface‐enhanced Raman spectroscopy sensing (SERS, e.g., refs. [ 18–22 ] ), using the boosted localized field to excite the vibrational signatures of chemicals/biomolecules. Although the enhancement factor approaching the quantum upper limit was reported (e.g., refs.…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Sub‐1‐nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

Zhang

Singer

et al. 2020

Advanced Optical Materials

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Metallic nanostructures with nanogap features can confine electromagnetic fields into extremely small volumes. In particular, as the gap size is scaled down to sub‐nanometer regime, the quantum effects for localized field enhancement reveal the ultimate capability for light–matter interaction. Although the enhancement factor approaching the quantum upper limit has been reported, the grand challenge for surface‐enhanced vibrational spectroscopic sensing remains in the inherent randomness, preventing uniformly distributed localized fields over large areas. Herein, a strategy to fabricate high‐density random metallic nanopatterns with accurately controlled nanogaps, defined by atomic‐layer‐deposition and self‐assembled‐monolayer processes, is reported. As the gap size approaches the quantum regime of ≈0.78 nm, its potential for quantitative sensing, based on a record‐high uniformity with the relative standard deviation of 4.3% over a large area of 22 mm × 60 mm, is demonstrated. This superior feature paves the way towards more affordable and quantitative sensing using quantum‐limit‐approaching nanogap structures.

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Fundamental understanding and applications of plasmon-enhanced Raman spectroscopy

Cited by 458 publications

References 186 publications

Shaping non-noble metal nanocrystals via colloidal chemistry

Shaping non-noble metal nanocrystals via colloidal chemistry

Improved Charge Transfer Contribution by Cosputtering Ag and ZnO

Large‐Scale Sub‐1‐nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

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