pH Dependent plasmon-driven surface-catalysis reactions of p,p′-dimercaptoazobenzene produced from para-aminothiophenol and 4-nitrobenzenethiol

Huang, Yingzhou; Dong, Bo

doi:10.1007/s11426-012-4786-4

Cited by 19 publications

(24 citation statements)

References 48 publications

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“…43,45,52 However, the pH has a significant effect, and this pH-sensitive phenomenon is also widely used to determine the pH in many systems. 43,45,52 TERS spectra collected from a pATP-modified tip apex immersed in buffer solutions with different pHs are shown in Supporting Information, Figure S2. The peak at 1442 cm -1 is assigned to the N=N stretching vibration mode while that at 1079 cm -1 is ascribed to the C-S stretching vibration mode.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale pH Profile at a Solution/Solid Interface by Chemically Modified Tip-Enhanced Raman Scattering

et al. 2016

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A nanoscale pH-profile on a 4×4 µm 2 area of NH 2 -anchored glass slide in an aqueous solution is constructed using chemically modified tip-enhanced Raman scattering (TERS). Para-mercaptobenzoic acid (pMBA) and para-aminothiophenol (pATP) are bonded to the tip surface. A pH change can be detected from a peak at 1422 cm -1 due to the -COOstretching vibration from pMBA and that at 1442 cm -1 due to the N=N stretching vibration arising from the formation of 4,4′-dimercaptoazobenzene (DMAB) on the pATP-modified tip.The pMBA-and pATP-modified tip can be used to determine pH in the range of 7-9 and 1-2, respectively. The spatial resolution to differentiate pH of two areas can be considered as ~400 nm. The measured pH becomes the pH of the bulk solution when the tip is far by ~200 nm from the surface. This technique suggests a possibility for the pH sensing in wet biological samples.TERS tips could also be chemically modified with other molecules to determine other properties in a solution.

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Section: Resultsmentioning

confidence: 99%

“…[40][41][42][43][44][45] For pMBA, a -COOH group transforms to a -COO -moiety when an acidic solution becomes alkaline. For pATP, in an alkaline solution, two pATP molecules react each other to form an azo (N=N) dimer, i.e., 4,4′-dimercaptoazobenzene (DMAB) while a pATP molecule is stable in acidic environments.…”

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confidence: 99%

Nanoscale pH Profile at a Solution/Solid Interface by Chemically Modified Tip-Enhanced Raman Scattering

et al. 2016

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“…[38][39][40] One of the most promising applications of SPPs, especially localized SPPs, is surface-enhanced Raman scattering (SERS), which has been studied both theoretically and experimentally for many decades. [12][13][14][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] As an optical fingerprint, Raman spectra, which could be used to analyze chemical structures, are widely used in scientific investigations and material analysis. However, as a weak process, the small Raman scattering cross-section makes the detection of a small number of molecules a problem even after the laser power is increased.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 The dominate contribution to this enhancement is generally thought to be the EM fields greatly enhanced by localized SPPs. 12,52,58 In addition, the charge transfer processes, which are the electronic structure variation of molecules adsorbed on metal surfaces, also play an important role in the SERS effect. [45][46][47][48]54 The area where the highest EM field enhancement is generated in a nanostructure is called a 'hot spot', such as the nanogap between the nanoparticle dimer and the gaps between nanoparticles and wires.…”

Section: Introductionmentioning

confidence: 99%

Nanowire-supported plasmonic waveguide for remote excitation of surface-enhanced Raman scattering

et al. 2014

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Due to its amazing ability to manipulate light at the nanoscale, plasmonics has become one of the most interesting topics in the field of light-matter interaction. As a promising application of plasmonics, surface-enhanced Raman scattering (SERS) has been widely used in scientific investigations and material analysis. The large enhanced Raman signals are mainly caused by the extremely enhanced electromagnetic field that results from localized surface plasmon polaritons. Recently, a novel SERS technology called remote SERS has been reported, combining both localized surface plasmon polaritons and propagating surface plasmon polaritons (PSPPs, or called plasmonic waveguide), which may be found in prominent applications in special circumstances compared to traditional local SERS. In this article, we review the mechanism of remote SERS and its development since it was first reported in 2009. Various remote metal systems based on plasmonic waveguides, such as nanoparticle-nanowire systems, single nanowire systems, crossed nanowire systems and nanowire dimer systems, are introduced, and recent novel applications, such as sensors, plasmon-driven surface-catalyzed reactions and Raman optical activity, are also presented. Furthermore, studies of remote SERS in dielectric and organic systems based on dielectric waveguides remind us that this useful technology has additional, tremendous application prospects that have not been realized in metal systems.

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“…1-3 SPR is characterized by a build-up of intense, spatially non-homogeneous oscillating electric fields in the neighborhood or at the surface of the nanostructured materials. [16][17][18][19][20][21][22][23][24][25][26][27] Since then, chemical reactions that can be realized directly by SP induction have been widely reported. 4 In the semiconductormetal hybrid systems, SP produced from metal nanoparticles can dramatically enhance the photocatalytic activities in the fields of water splitting, 5-8 hydrogen generation, [9][10][11][12] and chemical energy conversion.…”

Section: Introductionmentioning

confidence: 99%

An in situ SERS study of substrate-dependent surface plasmon induced aromatic nitration

Huang

Jing

et al. 2015

J. Mater. Chem. C

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Here we demonstrate the surface plasmon (SP) induced nitration of aromatic rings by an in situ surface enhanced Raman spectroscopy (SERS) technique. The size feature of the as-prepared Au, Ag and Ag@PDA@Au hierarchical structures allows monitoring the entire reaction process on a single hierarchical structure. With benzenethiol (BT) and HNO 3 as reactants, SP induced aromatic nitration can be successfully realized without the assistance of a conventional acid catalyst, H 2 SO 4 . Experimental and theoretical studies confirm that the nitration reaction leads to para-nitrothiophenol (p-NTP). While control experiments show that SP here functions as a local heating source and the presence of metal is also necessary for this nitration reaction. This SP induced aromatic nitration reaction also displays SERS substratedependent reaction kinetics, which proceeds more rapidly on the Au surface. Higher laser power can generate a stronger photothermal effect, and thus an accelerated reaction rate for this reaction. We believe this finding may broaden the research areas in the SP assisted or induced catalytic reactions.

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pH Dependent plasmon-driven surface-catalysis reactions of p,p′-dimercaptoazobenzene produced from para-aminothiophenol and 4-nitrobenzenethiol

Cited by 19 publications

References 48 publications

Nanoscale pH Profile at a Solution/Solid Interface by Chemically Modified Tip-Enhanced Raman Scattering

Nanoscale pH Profile at a Solution/Solid Interface by Chemically Modified Tip-Enhanced Raman Scattering

Nanowire-supported plasmonic waveguide for remote excitation of surface-enhanced Raman scattering

An in situ SERS study of substrate-dependent surface plasmon induced aromatic nitration

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