Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces

Rosendahl, Scott M.; Burgess, Ian J.

doi:10.1016/j.electacta.2007.11.020

Cited by 55 publications

(79 citation statements)

References 63 publications

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“…These results can be classified into two groups. The first group [8][9][10][11][12][13] displays an increase of the monolayer acidity as the potential is made more positive (in agreement with predictions from electrostatic models [17][18][19]), whereas the second group [14][15][16] shows the opposite trend (which has been rationalized in terms of a cation-exchange model [14][15]). The potential-induced ionization of 11-mercaptoundecanoic acid (MUA) monolayers has been reported to display both of these opposite trends, under the scrutiny of different experimental techniques and in the presence of different electrolyte solutions.…”

Section: Introductionsupporting

confidence: 55%

“…Usually, this control is exerted through the solution pH, but attachment of the thiol group to a metallic substrate opens the possibility of applying a potentiostatic control on the ionization degree of the terminal carboxylic groups. Evidence supporting the influence of the substrate potential on the acid dissociation of thiol monolayers has been gathered from a variety of techniques, including voltammetric [8][9][10][11][12], surface Raman [13], quartz microbalance [14] and infrared absortion [15,16] experiments. These results can be classified into two groups.…”

Section: Introductionmentioning

confidence: 99%

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Potentiostatic infrared titration of 11-mercaptoundecanoic acid monolayers

Luque¹,

Cuesta²,

Calvente³

et al. 2014

Electrochemistry Communications

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In situ IR difference spectra of 11-mercaptoundecanoic acid (MUA) monolayers deposited on gold, and in the presence of a NaF solution in deuterated water, have been recorded as a function of both solution pH * and substrate's potential. IR spectra recorded under voltammetric conditions indicate that the potential-induced ionization of the monolayer is a slow process, involving a simultaneous rearrangement of the hydrocarbon chains, and that a significant population of carboxylic groups are not dissociated at positive potentials, even in the presence of a pH * 9 solution. Steep potentiostatic IR titration curves, consistent with a monolayer pKa = 4.3, are obtained at negative potentials. As the potential is made more positive, titration curves become lower, broader and are shifted towards more basic pHs, as would be expected when only a fraction of the carboxylic groups become ionized in the presence of less favorable interactions. Rather than acting directly on the electrostatic energy of the carboxylate groups, the electrode potential seems to control the ionization of the monolayer by attracting (or repelling) cations from the electrolyte and by reorienting the thiol head groups inside and outside the low permittivity layer of methylene chains.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Potentiostatic infrared titration of 11-mercaptoundecanoic acid monolayers

Luque¹,

Cuesta²,

Calvente³

et al. 2014

Electrochemistry Communications

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show abstract

“…As shown by curve a in Fig. 6, a couple of obvious voltammetric peaks originated form the electric-field induced protonation/deprotonation of −COOH groups was observed at the 3-mercaptopropionic acid modified gold electrode [37][38][39], which may interfere in the detection of analytes. For the MPPA/Au electrode, no detectable peak current appeared (Fig.…”

Section: Analysis Of Dopamine At Mppa/au Electrodementioning

confidence: 98%

3-mercaptopropylphosphonic acid modified gold electrode for electrochemical detection of dopamine

Chen

Guo

Chen

et al. 2009

Bioelectrochemistry

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“…Not surprisingly, MBA molecules have been used in surface enhanced Raman scattering applications associated with silver and gold, 32,33 as well as in the context of self-assembled monolayers (SAMs) for bio-sensing. 34 However, to the best of our knowledge, there have yet to be any studies on applying MBA within a battery electrode design.…”

mentioning

confidence: 99%

Correlating Preparative Approaches with Electrochemical Performance of Fe₃O₄-MWNT Composites Used as Anodes in Li-Ion Batteries

Wang

et al. 2017

ECS J. Solid State Sci. Technol.

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Fe 3 O 4 nanoparticles (NPs) with an average size of 8-10 nm and a loading ratio of 50 wt% have been successfully attached onto the external surfaces of multi-walled carbon nanotubes (MWNTs) by means of three different preparative approaches, namely a sonication method, a covalent attachment protocol, as well as a non-covalent π-π interaction strategy. Specifically, the Fe 3 O 4 NPs associated with the sonication method lie directly on the outer surfaces of the MWNTs. Particles covalently attached onto the MWNTs formed amide chemical bonds through the mediation of the amorphous (3-aminopropyl) triethoxysilane (APTES) linker. Finally, particles were anchored non-covalently onto the underlying conjugated MWNTs via an aromatic 4-mercaptobenzoic acid (4-MBA) linker. Both structural and electrochemical characterization protocols have been used to systematically correlate the electrode performance with the corresponding attachment strategies. Fe 3 O 4 -MWNT composites generated by the π-π interaction strategy delivered 813, 768, 729, 796, 630, 580, 522, and 762 mAh/g under rates of 200, 400, 800, 100, 1200, 1600, 2000, and 100 mA/g, with 72% retention between cycles 2 and 80, demonstrating both higher capacity and better cycling stability as compared with analogues derived from the physical sonication as well as covalent attachment strategies. This finding may be attributed to the enhanced charge and ion transport coupled with retention of physical contact with the underlying MWNTs after a large volume change during cycling. Our collective results suggest that the non-covalent π-π attachment modality is a more effective preparative strategy for enhancing the performance of MWNT-Fe 3 O 4 composite electrodes after a full discharge process. Lithium ion battery (LIB) applications have experienced significant growth over the past two decades. Today LIBs are widely used and denote the battery of choice for a wide range of applications spanning from portable electronics to electric vehicles.1-5 Although LIBs have shown impressive commercial success, an understanding of the intrinsic functioning of LIB electrodes and of their constituent component materials still represents a subject of significant research. In recent years, the use of energy storage devices has expanded into new areas, including with uninterrupted power sources (UPS), stationary storage batteries (SSBs), and the automotive market, the latter of which encompasses both electric vehicles and hybrid electric vehicles. Hence, the development of LIBs based upon the use of lower cost and more earth abundant materials embodies a highly desirable objective.As an electroactive material, the inverse spinel structure of magnetite (Fe 3 O 4 ) epitomizes a particularly promising candidate for an anode material in LIB, due to its (i) significantly larger reversible capacity (i.e. 926 mAh g −1 , when reacting with eight lithium equivalents), (ii) plentiful earth abundance, and (iii) relative non-toxicity.

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Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces

Cited by 55 publications

References 63 publications

Potentiostatic infrared titration of 11-mercaptoundecanoic acid monolayers

Potentiostatic infrared titration of 11-mercaptoundecanoic acid monolayers

3-mercaptopropylphosphonic acid modified gold electrode for electrochemical detection of dopamine

Correlating Preparative Approaches with Electrochemical Performance of Fe₃O₄-MWNT Composites Used as Anodes in Li-Ion Batteries

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Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces

Cited by 55 publications

References 63 publications

Potentiostatic infrared titration of 11-mercaptoundecanoic acid monolayers

Potentiostatic infrared titration of 11-mercaptoundecanoic acid monolayers

3-mercaptopropylphosphonic acid modified gold electrode for electrochemical detection of dopamine

Correlating Preparative Approaches with Electrochemical Performance of Fe3O4-MWNT Composites Used as Anodes in Li-Ion Batteries

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Correlating Preparative Approaches with Electrochemical Performance of Fe₃O₄-MWNT Composites Used as Anodes in Li-Ion Batteries