The Experts below are selected from a list of 32151 Experts worldwide ranked by ideXlab platform
Richard P. Van Duyne - One of the best experts on this subject based on the ideXlab platform.
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operando characterization of iron phthalocyanine deactivation during oxygen reduction reaction using electrochemical tip enhanced Raman Spectroscopy
Journal of the American Chemical Society, 2019Co-Authors: Zhu Chen, George C. Schatz, Song Jiang, Duc Nguyen, Gyeongwon Kang, Richard P. Van DuyneAbstract:Electrochemical Tip-Enhanced Raman Spectroscopy (EC-TERS) has been implemented to investigate the structure and activity of iron(II) phthalocyanine (FePc)—a model catalyst for the oxygen reduction ...
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Investigation of Cobalt Phthalocyanine at the Solid/Liquid Interface by Electrochemical Tip-Enhanced Raman Spectroscopy
The Journal of Physical Chemistry C, 2019Co-Authors: Song Jiang, Guillaume Goubert, Zhu Chen, Xu Chen, Duc Nguyen, Michael Mattei, Richard P. Van DuyneAbstract:Electrochemical Tip-Enhanced Raman Spectroscopy (EC-TERS) with three excitation wavelengths in combination with in situ electrochemical scanning tunneling microscopy (EC-STM) and absorption measure...
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Tip-Enhanced Raman Spectroscopy: From concepts to practical applications
Chemical Physics Letters, 2016Co-Authors: Nan Jiang, Eric A. Pozzi, Mark C. Hersam, Naihao Chiang, Dmitry Kurouski, Richard P. Van DuyneAbstract:Abstract Tip-Enhanced Raman Spectroscopy (TERS) is a powerful technique that integrates the vibrational fingerprinting of Raman Spectroscopy and the sub-nanometer resolution of scanning probe microscopy (SPM). As a result, TERS is capable of obtaining chemical maps of analyzed specimens with exceptional lateral resolution. This is extremely valuable for the study of interactions between molecules and substrates, in addition to structural characterization of biological objects, such as viruses and amyloid fibrils, 2D polymeric materials, and monitoring electrochemical and photo-catalytic processes. In this mini-review, we discuss the most significant advances of TERS, including: super high resolution chemical imaging, monitoring of catalytic processes, incorporation of pulsed-excitation techniques, single-site electrochemistry, biosensing, and art conservation. We begin with a short overview of TERS, comparing it with other surface analytical techniques, followed by an overview of recent developments and future applications in TERS.
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Recent Advances in Tip-Enhanced Raman Spectroscopy.
The journal of physical chemistry letters, 2014Co-Authors: Matthew D. Sonntag, Eric A. Pozzi, Nan Jiang, Mark C. Hersam, Richard P. Van DuyneAbstract:Tip-Enhanced Raman Spectroscopy (TERS) has experienced tremendous growth in the last 5 years. Specifically, TER imaging has provided invaluable insight into the spatial distribution and properties of chemical species on a surface with spatial resolution that is otherwise unattainable by any other analytical method. Additionally, there has been further development in coupling ultrafast Spectroscopy with TERS in the hope of obtaining both ultrafast temporal and nanometer-scale spatial resolution. In this Perspective, we discuss several recent advances in TERS, specifically highlighting those in the areas of TER imaging and integrating ultrafast Spectroscopy with TERS.
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Tip-Enhanced Raman Spectroscopy with Picosecond Pulses
The journal of physical chemistry letters, 2013Co-Authors: Jordan M. Klingsporn, Matthew D. Sonntag, Tamar Seideman, Richard P. Van DuyneAbstract:Tip-Enhanced Raman Spectroscopy (TERS) can probe chemistry occurring at surfaces with both nanometer spectroscopic and submolecular spatial resolution. Combining ultrafast Spectroscopy with TERS allows for picosecond and, in principle, femtosecond temporal resolution. Here we couple an optical parametric oscillator (OPO) with a scanning tunneling microscopy (STM)-TERS microscope to excite the tip plasmon with a picosecond excitation source. The plasmonic tip was not damaged with OPO excitation, and TER spectra were observed for two resonant adsorbates. The TERS signal under ultrafast pulsed excitation decays on the time scale of 10 s of seconds; whereas with continuous-wave excitation no decay occurs. An analysis of possible decay mechanisms and their temporal characteristics is given.
Satoshi Kawata - One of the best experts on this subject based on the ideXlab platform.
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Optical antennas for tunable enhancement in Tip-Enhanced Raman Spectroscopy imaging
Applied Physics Express, 2015Co-Authors: Imad Maouli, Yuika Saito, Satoshi Kawata, Atsushi Taguchi, Prabhat VermaAbstract:The use of optical antennas in Tip-Enhanced Raman Spectroscopy (TERS) makes it a powerful optical analysis and imaging technique at the nanoscale. Optical antennas can work as nano-light sources in the visible region. The plasmonic resonance of an antenna depends on its length; thus, by varying the length, one can control the enhancement in TERS. In this study, we demonstrated a fabrication method based on focused ion beam milling to realize optical antennas with desired lengths. We then measured the resonances of these fabricated antennas and performed TERS imaging of carbon nanotubes to demonstrate the antenna length dependence on plasmonic resonance.
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Tip enhanced Raman Spectroscopy of carbon nanomaterials
2011Co-Authors: Norihiko Hayazawa, Taka-aki Yano, Katsuyoshi Ikeda, Satoshi KawataAbstract:We have successfully optimized tip-enhancement effect at metallized silicon cantilever tips for characterization of carbon nanomaterials such as single walled carbon nanotube and graphene layers. Plasmon resonance tuning relative to an excitation wavelength is crucial for efficient tip-enhancement, which is done by thermal oxidization of the silicon tips. Owing to the change of the refractive index, the plasmon resonance of the coated silver is blue-shifted showing an enormous enhancement at 532nm excitation. We demonstrate Tip-Enhanced Raman Spectroscopy on carbon nanomaterials that show constantly exhibit an enhancement factor of >100.
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Tip-Enhanced Raman Spectroscopy for nanoscale strain characterization
Analytical and Bioanalytical Chemistry, 2009Co-Authors: Alvarado Tarun, Norihiko Hayazawa, Satoshi KawataAbstract:Tip-Enhanced Raman Spectroscopy (TERS), which utilizes the strong localized optical field generated at the apex of a metallic tip when illuminated, has been shown to successfully probe the vibrational spectrum of today’s and tomorrow’s state-of-the-art silicon and next-generation semiconductor devices, such as quantum dots. Collecting and analyzing the vibrational spectrum not only aids in material identification but also provides insight into strain distributions in semiconductors. Here, the potential of TERS for nanoscale characterization of strain in silicon devices is reviewed. Emphasis will be placed on the key challenges of obtaining spectroscopic images of strain in actual strained silicon devices. Figure Figure Concept of Tip Enhanced Raman Spectroscopy (TERS), which utilizes the strong localized optical field generated at the apex of a metallic tip when illuminated. TERS has been demonstrated to successfully probe the vibrational spectrum of today’s and tomorrow’s state-of-the-art silicon and next generation semiconductor devices
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Tip-Enhanced Raman Spectroscopy for nanoscale strain characterization.
Analytical and bioanalytical chemistry, 2009Co-Authors: Alvarado Tarun, Norihiko Hayazawa, Satoshi KawataAbstract:Tip-Enhanced Raman Spectroscopy (TERS), which utilizes the strong localized optical field generated at the apex of a metallic tip when illuminated, has been shown to successfully probe the vibrational spectrum of today’s and tomorrow’s state-of-the-art silicon and next-generation semiconductor devices, such as quantum dots. Collecting and analyzing the vibrational spectrum not only aids in material identification but also provides insight into strain distributions in semiconductors. Here, the potential of TERS for nanoscale characterization of strain in silicon devices is reviewed. Emphasis will be placed on the key challenges of obtaining spectroscopic images of strain in actual strained silicon devices.
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Detection and characterization of longitudinal field for Tip-Enhanced Raman Spectroscopy
Applied Physics Letters, 2004Co-Authors: Norihiko Hayazawa, Yuika Saito, Satoshi KawataAbstract:We characterized the longitudinal field formed at a tightly focused spot by a high numerical aperture objective lens using a Tip-Enhanced near-field microscope. The longitudinal field efficiently excites the localized surface plasmon polaritons at the metallic tip apex resulting in an electric field enhancement. Radially polarized light generated by a combination of four half-waveplates successfully increases the longitudinal field resulting in higher sensitivity for Tip-Enhanced Raman Spectroscopy of adenine nanocrystals.
Andreas Ruediger - One of the best experts on this subject based on the ideXlab platform.
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Symmetry-Forbidden-Mode Detection in SrTiO3 Nanoislands with Tip-Enhanced Raman Spectroscopy
The Journal of Physical Chemistry C, 2021Co-Authors: Azza Hadj Youssef, Jiawei Zhang, Alborz Ehteshami, Gitanjali Kolhatkar, Chahinez Dab, Dorothée Berthomieu, Alexandre Merlen, François Légaré, Andreas RuedigerAbstract:Among the techniques to reveal the chemistry, structure, and dynamics of surfaces, Tip-Enhanced Raman Spectroscopy (TERS) occupies a unique position for the investigation of nonmetallic nanomateria...
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Nanoscale investigation of materials, chemical reactions, and biological systems by tip enhanced Raman Spectroscopy – a review
Journal of Materials Chemistry C, 2018Co-Authors: Gitanjali Kolhatkar, Julien Plathier, Andreas RuedigerAbstract:Almost two decades after the first experimental verification, tip enhanced Raman Spectroscopy has developed into a proficient tool of surface characterisation and provides a wealth of chemical and structural information with single molecule sensitivity and nanometric spatial resolution. We recall some highlights of this powerful tool for the investigation of diverse systems to then discuss how the structural arrangement of carbon composites and semiconductor materials has been explored. The advantages of tip enhanced Raman Spectroscopy for the study of biological systems, in particular DNA and RNA, will be detailed. We will also present the promise of electrochemical tip enhanced Raman Spectroscopy for the real time monitoring of chemical reactions. Eventually, we will discuss the importance of the metallic tip signal, specifically for the imaging of composition and configuration changes in various samples through variations in refractive index or permittivity.
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Relation between plasmonic tip emission and electromagnetic enhancement evidenced in tip‐enhanced Raman Spectroscopy
Journal of Raman Spectroscopy, 2017Co-Authors: Julien Plathier, Alexandre Merlen, A. Pignolet, Andreas RuedigerAbstract:We report Tip-Enhanced Raman Spectroscopy measurements of single wall carbon nanotubes deposited on a barium titanate substrate. The Tip-Enhanced Raman Spectroscopy mappings demonstrate that the evolution of the gold tip enhanced luminescence is strongly correlated with the intensity of the Raman modes from the single wall carbon nanotubes and the substrate. As the tip emission is directly related to the plasmonic properties of the nanoantenna at the apex of the tip, it is possible to compare the frequency and intensity of each vibrational mode with the electromagnetic enhancement model. We find a very good agreement between all these parameters confirming the essential role of the electromagnetic enhancement mechanism in surface enhanced Spectroscopy.
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Permittivity imaged at the nanoscale using Tip-Enhanced Raman Spectroscopy
Nanoscale horizons, 2017Co-Authors: Julien Plathier, A. Pignolet, Andrey Krayev, Vasili Gavrilyuk, Andreas RuedigerAbstract:Localized surface plasmon resonances are the dominating contribution to the optical enhancement and the lateral resolution in Tip-Enhanced Raman Spectroscopy. This well studied phenomenon may give access to more information about the sample than the enhanced Raman spectra alone due to its sensitivity to the permittivity of the tip environment. In this work, the effects of the permittivity of the sample on the properties of localized surface plasmon resonance are studied through the amplified signal of the luminescence of gold tips.
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Note: Tip enhanced Raman Spectroscopy with objective scanner on opaque samples
The Review of scientific instruments, 2012Co-Authors: Mischa Nicklaus, Andrey Krayev, Vasili Gavrilyuk, Christian Nauenheim, Alexey V. Belyaev, Andreas RuedigerAbstract:We report on 14 nm lateral resolution in Tip-Enhanced Raman Spectroscopy mapping of carbon nanotubes with an experimental setup that has been designed for the analysis of opaque samples in confocal side-access through a novel piezo-driven objective scanner. The objective scanner allows for fast and stable laser-to-tip alignment and for the adjustment of the focus position with sub-wavelength precision to optimize the excitation of surface plasmons. It also offers the additional benefit of imaging the near-field generated Raman scattering at the gap between tip and sample as direct control of the tip enhancement.
Norihiko Hayazawa - One of the best experts on this subject based on the ideXlab platform.
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Self-Consistent Tip Conditioning for Tip-Enhanced Raman Spectroscopy in an Ambient Environment
The Journal of Physical Chemistry C, 2020Co-Authors: Yasuyuki Yokota, Norihiko Hayazawa, Misun Hong, Bo Yang, Emiko Kazuma, Yousoo KimAbstract:Tip-Enhanced Raman Spectroscopy (TERS), which uses plasmons formed between the metallic tip and the sample upon laser irradiation, has emerged as a promising analytical method that is applicable in...
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Vibrational symmetry of a single molecule revealed by Tip-Enhanced Raman Spectroscopy
2019Co-Authors: Rafael Jaculbia, Norihiko Hayazawa, Bo Yang, Emiko Kazuma, Hiroshi Imada, Kuniyuki Miwa, Takeshi Iwasa, Masato Takenaka, Tetsuya Taketsugu, Yousoo KimAbstract:The scanning tunneling microscope (STM) is a powerful tool for studying various nanoscale materials with atomic scale spatial resolution. Despite the atom scale spatial sensitivity however, the STM lacks the chemical sensitivity crucial to the investigation of nanomaterials. Raman Spectroscopy on the other hand has a very strong chemical sensitivity but its spatial resolution is highly restricted by the diffraction limit of light allowing only about several hundreds of nanometer resolution. Combining these two powerful experiments into a technique called STM-tip enhanced Raman Spectroscopy (STM-TERS) alleviates the limitation of STM and Raman allowing for simultaneous subnanometer spatial resolution and high chemical sensitivity.
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Nanoscale Dehydrogenation Observed by Tip-Enhanced Raman Spectroscopy
The Journal of Physical Chemistry C, 2017Co-Authors: Songpol Chaunchaiyakul, Norihiko Hayazawa, Yousoo Kim, Agung Setiadi, Pawel Krukowski, Francesca Celine Catalan, Megumi Akai-kasaya, Akira Saito, Hideji Osuga, Yuji KuwaharaAbstract:This study shows evidence of nanoscale dehydrogenation occurring during Tip-Enhanced Raman Spectroscopy (TERS) measurements. The near-field TERS spectra obtained locally on a self-assembled monolayer of 2,13-bis(aldehyde)[7]thiaheterohelicene molecules showed vibrational frequencies in good agreement with that predicted by density functional theory calculations, except for the L-mode at ∼2000 cm–1, which is ascribed to a C≡C triple bond, implying that the benzene rings had been dehydrogenated during the experiments. Using peak analysis, incorporated with the molecular adsorption orientation deduced from high-resolution STM imaging, we conclude that one side benzene ring protruding upward was dehydrogenated as a result of pyrolysis, with the Ag tip serving as both local heat source and catalyst.
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Tip enhanced Raman Spectroscopy of carbon nanomaterials
2011Co-Authors: Norihiko Hayazawa, Taka-aki Yano, Katsuyoshi Ikeda, Satoshi KawataAbstract:We have successfully optimized tip-enhancement effect at metallized silicon cantilever tips for characterization of carbon nanomaterials such as single walled carbon nanotube and graphene layers. Plasmon resonance tuning relative to an excitation wavelength is crucial for efficient tip-enhancement, which is done by thermal oxidization of the silicon tips. Owing to the change of the refractive index, the plasmon resonance of the coated silver is blue-shifted showing an enormous enhancement at 532nm excitation. We demonstrate Tip-Enhanced Raman Spectroscopy on carbon nanomaterials that show constantly exhibit an enhancement factor of >100.
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Tip-Enhanced Raman Spectroscopy for nanoscale strain characterization
Analytical and Bioanalytical Chemistry, 2009Co-Authors: Alvarado Tarun, Norihiko Hayazawa, Satoshi KawataAbstract:Tip-Enhanced Raman Spectroscopy (TERS), which utilizes the strong localized optical field generated at the apex of a metallic tip when illuminated, has been shown to successfully probe the vibrational spectrum of today’s and tomorrow’s state-of-the-art silicon and next-generation semiconductor devices, such as quantum dots. Collecting and analyzing the vibrational spectrum not only aids in material identification but also provides insight into strain distributions in semiconductors. Here, the potential of TERS for nanoscale characterization of strain in silicon devices is reviewed. Emphasis will be placed on the key challenges of obtaining spectroscopic images of strain in actual strained silicon devices. Figure Figure Concept of Tip Enhanced Raman Spectroscopy (TERS), which utilizes the strong localized optical field generated at the apex of a metallic tip when illuminated. TERS has been demonstrated to successfully probe the vibrational spectrum of today’s and tomorrow’s state-of-the-art silicon and next generation semiconductor devices
Nan Jiang - One of the best experts on this subject based on the ideXlab platform.
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The Expanding Frontiers of Tip-Enhanced Raman Spectroscopy:
Applied spectroscopy, 2020Co-Authors: Jeremy F. Schultz, Sayantan Mahapatra, Nan JiangAbstract:Fundamental understanding of chemistry and physical properties at the nanoscale enables the rational design of interface-based systems. Surface interactions underlie numerous technologies ranging from catalysis to organic thin films to biological systems. Since surface environments are especially prone to heterogeneity, it becomes crucial to characterize these systems with spatial resolution sufficient to localize individual active sites or defects. Spectroscopy presents as a powerful means to understand these interactions, but typical light-based techniques lack sufficient spatial resolution. This review describes the growing number of applications for the nanoscale spectroscopic technique, Tip-Enhanced Raman Spectroscopy (TERS), with a focus on developments in areas that involve measurements in new environmental conditions, such as liquid, electrochemical, and ultrahigh vacuum. The expansion into unique environments enables the ability to spectroscopically define chemistry at the spatial limit. Through the confinement and enhancement of light at the apex of a plasmonic scanning probe microscopy tip, TERS is able to yield vibrational fingerprint information of molecules and materials with nanoscale resolution, providing insight into highly localized chemical effects.
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Tip-Enhanced Raman Spectroscopy: Chemical analysis with nanoscale to angstrom scale resolution.
The Journal of chemical physics, 2020Co-Authors: Sayantan Mahapatra, Jeremy F. Schultz, Nan JiangAbstract:Tip-Enhanced Raman Spectroscopy (TERS), a cutting-edge near-field spectroscopic tool, provides invaluable chemical insight with impressive spatial resolution in chemistry-related fields such as molecular and catalytic systems, surface science, two-dimensional materials, and biochemistry. High-resolution TERS, in particular, which has advanced exceptionally in the last five years, provides a unique opportunity to scrutinize single molecules individually. Here, this perspective places emphasis on the basic concepts and recent experimental findings of this state-of-the-art research and concludes with a glimpse of future prospects.
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Ultrahigh-Vacuum Tip-Enhanced Raman Spectroscopy
Chemical reviews, 2016Co-Authors: Eric A. Pozzi, Nan Jiang, Tamar Seideman, Guillaume Goubert, Naihao Chiang, Craig T. Chapman, Michael O. Mcanally, Anne Isabelle Henry, George C. Schatz, Mark C. HersamAbstract:Molecule–surface interactions and processes are at the heart of many technologies, including heterogeneous catalysis, organic photovoltaics, and nanoelectronics, yet they are rarely well understood at the molecular level. Given the inhomogeneous nature of surfaces, molecular properties often vary among individual surface sites, information that is lost in ensemble-averaged techniques. In order to access such site-resolved behavior, a technique must possess lateral resolution comparable to the size of surface sites under study, analytical power capable of examining chemical properties, and single-molecule sensitivity. Tip-Enhanced Raman Spectroscopy (TERS), wherein light is confined and amplified at the apex of a nanoscale plasmonic probe, meets these criteria. In ultrahigh vacuum (UHV), TERS can be performed in pristine environments, allowing for molecular-resolution imaging, low-temperature operation, minimized tip and molecular degradation, and improved stability in the presence of ultrafast irradiation...
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Tip-Enhanced Raman Spectroscopy: From concepts to practical applications
Chemical Physics Letters, 2016Co-Authors: Nan Jiang, Eric A. Pozzi, Mark C. Hersam, Naihao Chiang, Dmitry Kurouski, Richard P. Van DuyneAbstract:Abstract Tip-Enhanced Raman Spectroscopy (TERS) is a powerful technique that integrates the vibrational fingerprinting of Raman Spectroscopy and the sub-nanometer resolution of scanning probe microscopy (SPM). As a result, TERS is capable of obtaining chemical maps of analyzed specimens with exceptional lateral resolution. This is extremely valuable for the study of interactions between molecules and substrates, in addition to structural characterization of biological objects, such as viruses and amyloid fibrils, 2D polymeric materials, and monitoring electrochemical and photo-catalytic processes. In this mini-review, we discuss the most significant advances of TERS, including: super high resolution chemical imaging, monitoring of catalytic processes, incorporation of pulsed-excitation techniques, single-site electrochemistry, biosensing, and art conservation. We begin with a short overview of TERS, comparing it with other surface analytical techniques, followed by an overview of recent developments and future applications in TERS.
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Recent Advances in Tip-Enhanced Raman Spectroscopy.
The journal of physical chemistry letters, 2014Co-Authors: Matthew D. Sonntag, Eric A. Pozzi, Nan Jiang, Mark C. Hersam, Richard P. Van DuyneAbstract:Tip-Enhanced Raman Spectroscopy (TERS) has experienced tremendous growth in the last 5 years. Specifically, TER imaging has provided invaluable insight into the spatial distribution and properties of chemical species on a surface with spatial resolution that is otherwise unattainable by any other analytical method. Additionally, there has been further development in coupling ultrafast Spectroscopy with TERS in the hope of obtaining both ultrafast temporal and nanometer-scale spatial resolution. In this Perspective, we discuss several recent advances in TERS, specifically highlighting those in the areas of TER imaging and integrating ultrafast Spectroscopy with TERS.
