Au Tip-Enhanced Raman Spectroscopy for Catalysis

Wang, Jingang; Qiao, Wenming; Mu, Xijiao

doi:10.3390/app8112026

Cited by 9 publications

(6 citation statements)

References 85 publications

(103 reference statements)

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“…Raman spectroscopy is also made great contributions to the study of TE materials [103]. With the increasing technical requirements, Raman spectroscopy has now developed into multiple branches, e.g., resonance Raman spectroscopy, surface enhanced Raman spectroscopy [104,105], tip enhanced Raman spectroscopy [106], and micro Raman spectroscopy etc. Micro-Raman spectroscopy is one of the most important techniques to characterize nanomaterials, which can identify the number of layers of film materials [107], analyze the vibration modes of 2D materials in diverse case [71], and measure the thermal conductivity [22,108,109,110].…”

Section: Raman Techniquementioning

confidence: 99%

Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity

Dong

Fang

et al. 2018

Molecules

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The emergence and development of two-dimensional (2D) materials has provided a new direction for enhancing the thermoelectric (TE) performance due to their unique structural, physical and chemical properties. However, the TE performance measurement of 2D materials is a long-standing challenge owing to the experimental difficulties of precise control in samples and high demand in apparatus. Until now, there is no universal methodology for measuring the dimensionless TE figure of merit (ZT) (the core parameter for evaluating TE performance) of 2D materials systematically in experiments. Raman spectroscopy, with its rapid and nondestructive properties for probing samples, is undoubtedly a powerful tool for characterizing 2D materials as it is known as a spectroscopic ‘Swiss-Army Knife’. Raman spectroscopy can be employed to measure the thermal conductivity of 2D materials and expected to be a systematic method in evaluating TE performance, boosting the development of thermoelectricity. In this review, thermoelectricity, 2D materials, and Raman techniques, as well as thermal conductivity measurements of 2D materials by Raman spectroscopy are introduced. The prospects of obtaining ZT and testing the TE performance of 2D materials by Raman spectroscopy in the future are also discussed.

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Section: Raman Techniquementioning

confidence: 99%

Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity

Dong

Fang

et al. 2018

Molecules

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“…Over the years more and more functionality has been developed and built-in to commercial systems and there are now a large number of imaging modes beyond the standard contact mode, tapping mode and force distance spectroscopy that have increased the power of this technique. Indeed with the development of high-speed AFM [18,19], imaging modes such as TREC [20][21][22], Peakforce tapping mode [23,24], calibration procedures to precisely quantify force [25][26][27][28] and tip shape [29,30] as well as combining AFM with other types of microscopy [31][32][33][34] this technique will continue to develop and demonstrates considerable promise into the future. However, what remains consistent in the acquisition of AFM 2 of 15 data is that the resolution and measurement accuracy of that data is strongly dependant on the AFM tip diameter, shape and durability.…”

Section: Introductionmentioning

confidence: 99%

The Attachment of Carbon Nanotubes to Atomic Force Microscopy Tips Using the Pick-Up Method

Gibson

2020

Applied Sciences

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In the last 30 years research has shown that the resolution and reproducibility of data acquired using the atomic force microscope (AFM) can be improved through the development of new imaging modes or by modifying the AFM tip. One method that has been explored since the 1990s is to attach carbon nanotubes (CNT) to AFM tips. CNTs possess a small diameter, high aspect ratio, high strength and demonstrate a high degree of wear resistance. While early indications suggested the widespread use of these types of probes would be routine this has not been the case. A number of methods for CNT attachment have been proposed and explored including chemical vapor deposition (CVD), dielectrophoresis and manual attachment inside a scanning electron microscope (SEM). One of the earliest techniques developed is known as the pick-up method and involves adhering CNTs to AFM tips by simply scanning the AFM tip, in tapping mode, across a CNT-covered surface until a CNT attaches to the AFM tip. In this work we will further investigate how, for example, high force tapping mode imaging can improve the stability and success rate of the pick-up method. We will also discuss methods to determine CNT attachment to AFM probes including changes in AFM image resolution, amplitude versus distance curves and SEM imaging. We demonstrate that the pick-up method can be applied to a range of AFM probes, including contact mode probes with relatively soft spring constants (0.28 N/m). Finally, we demonstrate that the pick-up method can be used to attach CNTs to two AFM tips simultaneously. This is significant as it demonstrates the techniques potential for attaching CNTs to multiple AFM tips which could have applications in AFM-based data storage, devices such as the Snomipede, or making CNT-AFM tips more commercially viable.

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“…Surface-enhanced Raman scattering (SERS) and tip-enhanced Raman spectroscopy (TERS) are widely used in the fields of physics, chemistry, biology, medicine, and materials, and they are highly sensitive molecular-detection tools that play a significant role in research on the electronic structure and spectral properties of molecules and plasmon-driven chemical reactions [1][2][3][4][5][6][7][8][9]. Recently, we studied the physical mechanism of plasmon-enhanced resonance Raman and fluorescence spectra [10] to understand the applications and principles of photoinduced charge transfer [11].…”

Section: Introductionmentioning

confidence: 99%

“…A lot of research shows that conversion of 4-nitrobenzenethiol (4NBT) and p-aminothiophenol (PATP) to 4,4 -dimercaptoazobenzene (DMAB) via reduction and oxidation reactions was achieved with SERS technology [2][3][4][5][6][7][8][9][10][11][14][15][16][17][18]. Theoretical and experimental studies showed that SERS synthesis of DMAB from PATP is achieved via the selective catalytic coupling of Ag nanoparticles (Ag NPs).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reversible Reactions Driven by Localized Surface Plasmon Resonance

Zheng

Wang

2019

Catalysts

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In this study, we review photocatalytic reversible surface catalytic reactions driven by localized surface plasmon resonance. Firstly, we briefly introduce the synthesis of 4,4′-dimercaptoazobenzene (DMAB) from 4-nitrobenzenethiol (4NBT) using surface-enhanced Raman scattering (SERS) technology. Furthermore, we study the photosynthetic and degradation processes of 4NBT to DMAB reduction, as well as factors associated with them, such as laser wavelength, reaction time, substrate, and pH. Last but not least, we reveal the competitive relationship between photosynthetic and degradation pathways for this reduction reaction by SERS technology on the substrate of Au film over a nanosphere.

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Au Tip-Enhanced Raman Spectroscopy for Catalysis

Cited by 9 publications

References 85 publications

Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity

Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity

The Attachment of Carbon Nanotubes to Atomic Force Microscopy Tips Using the Pick-Up Method

Photocatalytic Reversible Reactions Driven by Localized Surface Plasmon Resonance

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