Preparation of monocrystalline Pt microelectrodes and electrochemical study of the plane surfaces cut in the direction of the {111} and {110} planes

Clavilier, J.; Faure, R.; Guinet, G.; Durand, Robert

doi:10.1016/s0022-0728(79)80022-4

Cited by 1,493 publications

(798 citation statements)

References 7 publications

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“…35 For the formation of a submonolayer of dye molecules, the crystal was wetted with a droplet of a 10 6 M ethanolic MGITC dye solution, which dried off quickly. The total amount of dye present was significantly below a monolayer with respect to the substrate atoms.…”

Section: Methodsmentioning

confidence: 99%

Tip‐enhanced Raman spectroscopy (TERS) of malachite green isothiocyanate at Au(111): bleaching behavior under the influence of high electromagnetic fields

Pettinger

Ren

Picardi

et al. 2005

J Raman Spectroscopy

142

154

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Tip-enhanced Raman spectroscopy (TERS) was investigated with malachite green isothiocyanate adsorbed at an Au(111) surface. TERS is based on the excitation of localized surface plasmons in the tip apex, producing strongly enhanced electromagnetic fields. The key conditions for giant TERS are sideillumination of the tip, well-prepared single-crystalline surfaces and sharp, smooth gold tips. A TERS enhancement of about 6 × 10 6 has been observed for dye molecules adsorbed at the Au(111) substrate in a region of about 50 nm diameter beneath the tip. This corresponds to a 2500-fold increase in the light intensity at the Au(111)/air interface, which in addition causes fast but local bleaching of the dye. This bleaching behavior was analyzed in detail, giving direct insight into the strength and size of the enhanced field. In addition, the bleaching constant was higher for MGITC in an unperturbed environment than for MGITC in an environment that had been substantially bleached. The MGITC spectra were also different for these two cases. Copyright  2005 John Wiley & Sons, Ltd.KEYWORDS: apertureless scanning near-field optical microscopy; gold(111); tip-enhanced Raman spectroscopy; malachite green isothiocyanate; near-field enhancement INTRODUCTIONThe general use of Raman spectroscopy for surface studies is an old dream of surface scientists. However, with differential Raman cross-sections of the order of d /d ³ 10 31 -10 28 cm 2 sr 1 , surface studies were out of reach in general, although a (small) number of attempts were made to apply (normal) Raman scattering for the investigation of well-defined surfaces.Ł Correspondence to: Bruno Pettinger, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany. E-mail: pettinger@fhi-berlin.mpg. Recently, a new approach has been developed, denoted tip-enhanced Raman spectroscopy (TERS), in some cases also called 'apertureless scanning near-field optical microscopy (SNOM)'. 1 With the advent of TERS, the above-mentioned dream is now becoming a reality. 1 -12 TERS is a particular promising variant of SERS, the well-studied field of surface-enhanced Raman scattering spectroscopy. The latter requires roughened surfaces at which two cooperative enhancement mechanisms for Raman scattering are working. Roughened surfaces can support the excitation of localized surface plasmons leading to the so-called 'electromagnetic enhancement' and provide the peculiar adsorption sites at which the so-called 'chemical enhancement' is operative. In the literature, a large range of (total) enhancement factors are given, starting with the 10 6 -fold enhancement found for pyridine on roughened silver electrodes 13 up to the giant 10 12 -10 14 -fold enhancement reported more recently by Nie and Emory 14 and Kneipp et al. 15 for dyes at colloidal particles. In the latter case, the authors claim to have reached single-molecule detection sensitivity. However, in all these cases the general drawback of SERS investigations remains: the surface enhancement (in particular its ...

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Section: Methodsmentioning

confidence: 99%

Tip‐enhanced Raman spectroscopy (TERS) of malachite green isothiocyanate at Au(111): bleaching behavior under the influence of high electromagnetic fields

Pettinger

Ren

Picardi

et al. 2005

J Raman Spectroscopy

142

154

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“…In the case of platinum electrodes, the voltammetric profile in the supporting electrolyte is extremely sensitive to the surface structure, allowing a qualitative assessment of the quality of the single crystal. For this metal, the improvement in the methodology for obtaining single crystal electrodes has continuously increased since the discovery of the flame annealing treatment [1,2]. The combination of the use of less defective single crystals electrodes and the use of solutions of higher purity has had their effect in the voltammetry with a significant diminution of the observed defects, leading to sharper and more symmetric features.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic studies of anion adsorption at the Pt(111) electrode surface from glycolic acid solutions

Arán‐Ais

Herrero

Feliu

2014

J Solid State Electrochem

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Kinetic glycolic acid (GA) oxidation and thermodynamic glycolate adsorption have been studied on Pt single crystal electrodes. The voltammetric profiles of Pt(111), Pt(100) and Pt(110) in 0.1 M GA are shown, and the effect of the inclusion of steps on the Pt(111) surface has been studied by cyclic voltammetry. For Pt(111) electrode, different concentrations and sweep rates have been applied, revealing that both adsorption and oxidation processes take place. By establishing the appropriate conditions, a complete thermodynamic analysis has been performed by using the electrode potential and the charge as independent variables. Total charge density curves, surface pressure at total charge density and at constant electrode potential were determined to calculate the Gibbs excess and the charge number at constant electrode potential for glycolate adsorption on Pt(111). Maximum glycolate coverage on the surface reaches a value of ∼ 6.0 ×10 14 ions/cm 2 . Spectroscopic results show the formation of CO 2 during the oxidation of glycolic acid, indicating that the cleavage of the C-C bond occurs during the oxidation process.

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“…The substrate was Pt͑111͒, prepared by flame annealing and quenching method. 12 The measurements were carried out in tetraethyleneglycol dimethyl ether ͑tetrag-lyme͒. The solution contained 1mM 1,4-diisocyanobenzene and 1,4-benzenedithiol.…”

mentioning

confidence: 99%

Conductance of single 1,4-disubstituted benzene molecules anchored to Pt electrodes

Kiguchi

Miura

Hara

et al. 2007

Applied Physics Letters

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The authors have studied the conductance of a 1,4-disubstituted isocyanide͑-NC͒ or thiol͑-SH͒ benzene molecule anchored to two Pt electrodes. A single molecular junction showing a well-defined conductance value ͑ϳ3 ϫ 10 −2 G 0 , G 0 =2e 2 / h͒ was fabricated with the Pt electrodes. The conductance of the molecular junction was one order higher than the previously documented value using Au electrodes. These observations could be explained by differences in the local density of states of the contact metal atom at the Fermi level and the extent of the hybridization and energy difference between the molecular and metal orbitals. Further insight into the binding strengths of the metal-anchoring group bond was obtained by statistically analyzing the stretching length of the molecular junction.

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Preparation of monocrystalline Pt microelectrodes and electrochemical study of the plane surfaces cut in the direction of the {111} and {110} planes

Cited by 1,493 publications

References 7 publications

Tip‐enhanced Raman spectroscopy (TERS) of malachite green isothiocyanate at Au(111): bleaching behavior under the influence of high electromagnetic fields

Tip‐enhanced Raman spectroscopy (TERS) of malachite green isothiocyanate at Au(111): bleaching behavior under the influence of high electromagnetic fields

Thermodynamic studies of anion adsorption at the Pt(111) electrode surface from glycolic acid solutions

Conductance of single 1,4-disubstituted benzene molecules anchored to Pt electrodes

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