Shell‐Isolated Tip‐Enhanced Raman and Fluorescence Spectroscopy

Huang, Yan‐Hua; Huang, Su-Dan; Wang, Xiangjie; Bodappa, Nataraju; Li, Chaoyu; Yin, Hao; Su, Hai‐Sheng; Meng, Meng; Zhang, Hua; Ren, Bin; Yang, Zhilin; Zenobi, Renato; Zhang, Tian; Li, Jianfeng

doi:10.1002/anie.201802892

Cited by 51 publications

(41 citation statements)

References 35 publications

(16 reference statements)

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“…Yet, at the same time, it may play a major role in the plasmon-driven reactivity of the particle, since the catalytic site is located in the SERS hot spot 45,46 . shell-isolated tips 52 . The broad band at 1200 cm -1 comprises mostly the C-C and C-N stretching vibrations of the pirydyl ring 51 .…”

Section: Resultsmentioning

confidence: 99%

Preserving Plasmonic Nanostructures from Laser-Induced Deactivation by a Protective Dielectric Shell

et al. 2020

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Noble metal nanostructures are highly efficient in harvesting light. Their strong plasmonic properties enable ultra-sensitive spectroscopy, catalysis of chemical reactions with sunlight, photothermal treatment of cancer, and much more. Ironically, they frequently lose their excellent optical properties upon irradiation with intense laser light. Here, we show that the photostability of Ag nanostructures can be dramatically improved by a protective 4-nm-thick SiO2 coating. Enhanced Raman and far-field scattering spectra were compared for bare and shell-isolated Ag nanoparticles and nanotips. The shell-isolated nanostructures produced stable spectroscopic signal, even at high laser fluences, contrary to their bare Ag counterparts. This result suggests that the dielectric coating immobilizes the surface Ag atoms and preserves the shape of the nanostructure and its plasmon resonance. The results presented are important for virtually any application of plasmonic nanoparticles; this study sheds light on the deactivation of plasmonic nanostructures during operation and proposes a practical solution to mitigate that problem.

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Section: Resultsmentioning

confidence: 99%

Preserving Plasmonic Nanostructures from Laser-Induced Deactivation by a Protective Dielectric Shell

et al. 2020

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“…Development of electrochemical tip‐enhanced Raman spectroscopy (EC‐TERS) is going to be fundamental to study electrochemical phenomena at the real nanoscale, Figure . The first examples of EC‐TERS are providing very interesting results . A great effort must be made to develop simpler experimental setups and to produce very reproducible tips.…”

Section: Challengesmentioning

confidence: 99%

Spectroelectrochemical Sensing: Current Trends and Challenges

et al. 2019

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Spectroelectrochemistry (SEC) has been used for more than 50 years, but this set of techniques has not been widely used for quantitative analysis. For many years, no commercial instruments were available, which made very difficult to spread the use of SEC. Nowadays, only the creativity of the researchers is required to exploit the capabilities of SEC. This review is written with the aim of showing the potential of SEC, mainly for analytical chemistry. Here, we explain what SEC is, how analytical responses can be obtained, why these techniques are useful for sensors, with a brief description of its advantages in use, and, finally, we try to show the challenges that must be addressed in the next years. SEC can resolve interesting analytical problems using the high amount of data provided by this intrinsic trilinear technique. Given the quantitative analysis point of view of this review, the discussion of the SEC techniques is focused on UV/Vis absorption, photoluminescence and Raman SEC.

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“…Various metallic nanostructures have been developed thus far for amplifying the plasmonic hotspots, including low-dimensional metallic nanostructures with highly localized electromagnetic field and two-/three-dimensional architectures with increased surface areas [5][6][7][8][9][10][11]. In addition, new analytical tools, including tip-enhanced Raman spectroscopy and shell-isolated nanoparticle-enhanced Raman spectroscopy, have been proposed for single-molecule detection with spatial resolution on the order of the sub-diffraction limit [5,[12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

UV Irradiation-Induced SERS Enhancement in Randomly Distributed Au Nanostructures

Lee

Kim

2020

Sensors

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Currently used platforms for surface-enhanced Raman scattering (SERS) sensors generally employ metallic nanostructures for enrichment of the plasmonic hotspots in order to provide higher Raman signals, but this procedure is still considered challenging for analyte–surface affinity. This study reports a UV irradiation-induced SERS enhancement that amplifies the interactions between the analytes and metallic surfaces. The UV light can play critical roles in the surface cleaning to improve the SERS signal by removing the impurities from the surfaces and the formation of the negatively charged adsorbed oxygen species on the Au surfaces to enhance the analyte–surface affinity. To evaluate this scenario, we prepared randomly distributed Au nanostructures via thermal annealing with a sputtered Au thin film. The UV light of central wavelength 254 nm was then irradiated on the Au nanostructures for 60 min. The SERS efficiency of the Au nanostructures was subsequently evaluated using rhodamine 6G molecules as the representative Raman probe material. The Raman signal of the Au nanostructures after UV treatment was enhanced by up to approximately 68.7% compared to that of those that did not receive the UV treatment. We expect that the proposed method has the potential to be applied to SERS enhancement with various plasmonic platforms.

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Shell‐Isolated Tip‐Enhanced Raman and Fluorescence Spectroscopy

Cited by 51 publications

References 35 publications

Preserving Plasmonic Nanostructures from Laser-Induced Deactivation by a Protective Dielectric Shell

Preserving Plasmonic Nanostructures from Laser-Induced Deactivation by a Protective Dielectric Shell

Spectroelectrochemical Sensing: Current Trends and Challenges

UV Irradiation-Induced SERS Enhancement in Randomly Distributed Au Nanostructures

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