Adsorption of 3-mercaptopropyltrimethoxysilane and 3-aminopropyltrimethoxysilane at platinum electrodes

Brito, Rosa; Rodríguez, Veloz; Figueroa, J.M.; Cabrera, Carlos R.

doi:10.1016/s0022-0728(01)00718-5

Cited by 36 publications

(31 citation statements)

References 31 publications

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“…After cleaning, both the ITO and Pt substrates were immersed in the 1,12-dodecanediamine (DDA) solution (5.0 × 10 −3 M) of absolute methanol for 48 h to form a DDA monolayer on their surfaces [23,24]. The resulting film-coated ITO and Pt substrates were rinsed with copious absolute methanol and then dried under a stream of high-purity N 2 .…”

Section: Preparation Of Gold Nanoparticle Assemblies On Ito and Pt Sumentioning

confidence: 99%

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Electrocatalytic oxidation of CO on supported gold nanoparticles and submicroparticles: Support and size effects in electrochemical systems

Diao

Zhang

Guo

et al. 2007

Journal of Catalysis

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Section: Preparation Of Gold Nanoparticle Assemblies On Ito and Pt Sumentioning

confidence: 99%

“…These gold particles were prepared by the Frens method [25] and had an average diameter of 13 ± 1 nm. The DDA was used as a linking molecule to immobilize AuNPs on ITO [23] and Pt [24] substrates. The AuNPs are negatively charged due to the adsorption of anions at pH > 2 [28,29].…”

Section: Effect Of the Applied Potential On The Activity Of Aunps Towmentioning

confidence: 99%

Electrocatalytic oxidation of CO on supported gold nanoparticles and submicroparticles: Support and size effects in electrochemical systems

Diao

Zhang

Guo

et al. 2007

Journal of Catalysis

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“…Finally, they were dried with an argon gas flow. The current-potential behavior, characteristic of a clean platinum surface in a clean test solution [26], has been presented in a previous publication [27]. This was used as a criterion of solution and electrode cleanliness in aqueous 0.5 M H 2 SO 4 .…”

Section: Substrate Pre-treatment and Derivatizationmentioning

confidence: 99%

Electron transfer kinetics across derivatized self-assembled monolayers on platinum: a cyclic voltammetry and electrochemical impedance spectroscopy study

Brito¹,

Tremont²,

Cabrera³

2004

Journal of Electroanalytical Chemistry

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“…SAMs have, additionally, been prepared by chemisorption of organic molecules containing various functional groups such as -SH, [28] -COOH, [29] -NH2, [30,31] etc. and are also known on a variety of electrode surfaces other than gold, such as platinum, [31,[44][45][46] copper, [47][48] silver [49] and silicon. [50][51] Although well-ordered and defect free SAMs are often an idealised target structure, self-assembled monolayers may contain pinholes or defects which would restrict use in many applications.…”

Section: Introductionmentioning

confidence: 99%

Modification of Electrode Surfaces by Self‐Assembled Monolayers of Thiol‐Terminated Oligo(Phenyleneethynylene)s

et al. 2013

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The wire‐like properties of four S‐(4‐{2‐[4‐(2‐phenylethynyl)phenyl]ethynyl}phenyl) thioacetate derivatives, PhC≡CC6H4C≡CC6H4SAc (1), H2NC6H4C≡CC6H4C≡CC6H4SAc (2), PhC≡CC6H2(OMe)2C≡CC6H4SAc (3) and AcSC6H4C≡CC6H4C≡CC6H4SAc (4) (Figure 1), all of which possess a high degree of conjugation along the oligo(phenyleneethynylene) (OPE) backbone, were investigated as self‐assembled monolayers (SAMs) on gold and platinum electrodes by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The redox probe [Fe(CN)6]4− was used in both the CV and impedance experiments. The results indicate that the thiolates derived from thioacetate‐protected precursor molecules 1 and 2 form well‐ordered monolayers on a gold electrode, whereas SAMs derived from 3 and 4 exhibit randomly distributed pinholes. The electron tunnelling resistance and fractional coverage of SAMs of all four compounds were examined using electron tunnelling theory. The analysis of the results reveal that the well‐ordered SAMs of 1 and 2 exhibit higher charge‐transfer resistance in comparison to the defect‐ridden SAMs of 3 and 4. The additional steric bulk offered by the methoxy groups in 3 is likely to prevent efficient packing within the SAM, leading to a microelectrode behaviour, when assembled on a gold electrode surface. The protected dithiol derivative 4 probably binds to the surface through both terminal groups which prevents dense packing and leads to the formation of a monolayer with randomly distributed pinholes. Atomic force microscopy (AFM) was used to examine the morphology of the monolayers, and height images gave root‐mean‐square (RMS) roughness′s which are in agreement with the proposed SAM structures.

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Adsorption of 3-mercaptopropyltrimethoxysilane and 3-aminopropyltrimethoxysilane at platinum electrodes

Cited by 36 publications

References 31 publications

Electrocatalytic oxidation of CO on supported gold nanoparticles and submicroparticles: Support and size effects in electrochemical systems

Electrocatalytic oxidation of CO on supported gold nanoparticles and submicroparticles: Support and size effects in electrochemical systems

Electron transfer kinetics across derivatized self-assembled monolayers on platinum: a cyclic voltammetry and electrochemical impedance spectroscopy study

Modification of Electrode Surfaces by Self‐Assembled Monolayers of Thiol‐Terminated Oligo(Phenyleneethynylene)s

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