Electrochemical STM Tip-Enhanced Raman Spectroscopy Study of Electron Transfer Reactions of Covalently Tethered Chromophores on Au(111)

Xu, Chen; Goubert, Guillaume; Jiang, Song; Duyne, Richard P. Van

doi:10.1021/acs.jpcc.8b03163

Cited by 28 publications

(34 citation statements)

References 33 publications

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“…NB has been quite popular as a redox Raman active probe in creating of different modifications of Raman spectroscopy. Covalently tethered to a gold electrode NB has been tested using in situ tip-enhanced Raman spectroscopy (TERS), and a reversible decrease of TERS intensity was found upon electrochemical reduction of NB [9]. Similarly, a combination of TERS with atomic force microscopy and electrochemistry has been used to observe the nanoscale spacial distribution of a formal potential with the use of single molecule NB spectroelectrochemistry spaced at 5-10 nm from the electrode [10].…”

Section: Introductionmentioning

confidence: 99%

Raman spectroelectrochemical study of redox dye Nile blue adsorbed or electropolymerised at a gold electrode

Mažeikienė¹,

Niaura²,

Eicher‐Lorka³

et al. 2019

chemija

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The redox dye Nile blue has been adsorbed and electrochemically polymerised at a roughened gold electrode. The resulting modified electrodes were subjected to Raman spectroelectrochemical study with 785 nm laser line excitation. For both types of electrodes, well-expressed and rich in features Raman spectra were obtained. The spectra are closely related to those of another oxazine type redox dye Meldola blue. At solution pH 7.0, the overall intensity of the Raman spectra for both types of modified electrodes appears higher than in a pH 1.0 solution. Probably, this is caused by different light absorbance properties of this dye in two solutions. In a pH-neutral solution, the dye possess light absorbance in the red range of the visible spectrum, thus, resonance enhancement is possible. The intensity of the Raman spectra also increases by the shift of the electrode potential to higher positive values. This effect could be understood taking into account an intensifying colouration of the dye at a stepwise increase of the electrode potential due to a continuous growth of the content of oxidised forms within the electrode-bound layer.

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Section: Introductionmentioning

confidence: 99%

Raman spectroelectrochemical study of redox dye Nile blue adsorbed or electropolymerised at a gold electrode

Mažeikienė¹,

Niaura²,

Eicher‐Lorka³

et al. 2019

chemija

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“…The side illumination and collection setup enables measurements on transparent or opaque sample carriers and allows AFM, SFM, and STM feedback modes. The areas of application are in biology, AFM, , and predominantly EC-STM-TERS measurements in the field of molecular configuration , and the study of the electron transfer reaction, redox reactions, and catalytic behavior. , Tables and summarize the main results to date, categorized by feedback type (SFM, STM, and AFM). Table compares the technical details, while Table presents results obtained and chemical bonds measured in these works.…”

Section: The Main Experiments and Applications To Datementioning

confidence: 99%

Challenges and Opportunities of Tip-Enhanced Raman Spectroscopy in Liquids

2021

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Tip-enhanced Raman spectroscopy (TERS) is an emerging technique with a large number of potential applications in different fields such as chemistry, physics, biology, life sciences, and materials science. TERS in liquids offers nondestructive and label-free topographical and chemical imaging of molecules and chemical reactions under native conditions at a nanometer scale. It combines Raman spectroscopy with scanning probe microscopy, providing a unique combination of chemical information and high spatial resolution. The versatility of TERS increases even further if it is modified for simultaneous electrochemical measurements. This paper reviews the recent progress of TERS in liquid, with a focus on molecular structures, interfaces, and chemical reactions studied to date. For example, TERS studies revealed nanoscale chemical images of various molecules containing a benzene ring such as thiophenol or carbon nanotubes. Additionally, heterogeneous catalytic reactions at the solid−liquid interface were investigated in a new way to gain a deeper insight into electrochemical processes. Furthermore, TERS measurements expanded our knowledge of several redox compounds and enabled new insights into various chemical transformations. Despite substantial progress, TERS in liquids is not yet a routine measurement method, and there are still several challenges to solve before TERS can unleash its full potential.

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“…Recently, the Van Duyne group demonstrated the first nanometer scale detection of the electron transfer reaction of NB molecules that were covalently bonded with Au(111) electrode with in-situ TERS. 191 A potential swap between +0.109 V and –0.241 V caused the appearance and disappearance of characteristic TERS spectra that directly related to the oxidized or reduced form of the molecule. In this study, TERS intensity decreased as the NB was reduced reversibly.…”

Section: Non-ambient Measurement Conditionsmentioning

confidence: 99%