Studying the localized deposition of Ag nanoparticles on self-assembled monolayers by scanning electrochemical microscopy (SECM)

Malel, Esteban; Colleran, John; Mandler, Daniel

doi:10.1016/j.electacta.2011.06.017

Cited by 23 publications

(23 citation statements)

References 46 publications

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“…There are many practical instances in which the surface to be investigated contains randomly distributed small channels blocked at their end by a conducting surface, such as pinholes,8 defects9 or, more in general, shallow recessed nanoelectrodes,10 which can be produced by modification of conducting substrates with an insulating polymer or metal oxide layer 10. These issues have been addressed by either voltammetry9c, 10 or a variety of scanning electrochemical microscopy (SECM) modes 8c. 9d, 10 However, to reveal single pores of submicron dimensions, SECM tips of similar submicron sizes are required 11.…”

Section: Introductionmentioning

confidence: 99%

Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes

2013

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This paper reports on the use of a micropipette contact method (MCM) to reveal and characterise single submicrometer‐sized pores randomly distributed within a thin insulating alumina layer (250 nm thickness) that coats a platinum film substrate (Pt/Al2O3). Moveable micropipette probes, with orifice radii of 40–50 μm, filled with electrolyte solutions, are brought in contact with the sample surface to form a microcell and allow electrochemical reactions to be confined within a limited contact region. The aqueous solutions inside the micropipettes contain Ru(NH3)63+ or Ag+ ions and cyclic voltammograms (CVs) are obtained for several locations of 500×500 μm2 above the Pt/Al2O3 sample. The presence of nanoscopic pores is revealed by sigmoidally shaped volatmmograms, which are recorded when Ru(NH3)63+ is used as redox probe. From the steady‐state limiting current and the theoretical equation that applies for recessed microelectrodes, the radius of each platinum disk at the bottom of the pore is evaluated. In this way, pore sizes spanning from about 50 nm to 350 nm are revealed. Similar information is obtained by the use of the MCM with the pipette filled with Ag+ ions. In this case, CVs typical for nucleation and growth of metallic silver are recorded. The volume of a single pore is evaluated from the charge involved in the anodic stripping process of the metal deposited. Potential step measurements and relevant current (I) against time (t) transients allow establishing that only a single nucleus can be grown in each submicometer‐sized pore. Moreover, a diffusion coefficient value of 1.41×10−5 cm2 s−1 for Ag+ is evaluated from the experimental I vs. t1/2 linear plot. Finally, the measurements performed at the Pt/Al2O3 sample are compared with those obtained by using a plain platinum disk electrode 3 mm diameter as substrate for MCM measurements.

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Section: Introductionmentioning

confidence: 99%

Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes

2013

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“…Br 2 and HOBr act as oxidants and have been used for semiconductor etching, [1,8] polyaniline deposition, [3] and the deactivation of enzyme layers. [2] Other probe-generated reagents include metal ions for metal deposition, [9,10] catalytically active metal ions, [11] and aryl diazonium salts. [6,12] The pH shift associated with nitrite oxidation was applied in the local etching of a thin Ni coating on a gold substrate in a chemical lens.…”

mentioning

confidence: 99%

Parallel Imaging and Template‐Free Patterning of Self‐Assembled Monolayers with Soft Linear Microelectrode Arrays

Lesch¹,

Vaske²,

Meiners³

et al. 2012

Angew Chem Int Ed

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“…In SECM, electroactive species are generated from the tip electrode which can approach to the substrate electrode in a close proximity, making a local electrochemical process possible. Local electrochemical depositions of metals using a SECM have been performed in various ways . Generally, to deposit a material within a confined area, a tip generation‐substrate collection (TG‐SC) mode has been used where a tip triggers a certain reaction producing a precursor being reduced or oxidized at a substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Metal ions generated from a metal tip surface by the anodic dissolution and then reduced on the substrate electrode which is close to the tip electrode. Mandler and coworkers studied localized deposition using this anodic dissolution of Au , Ag and Co . Abad et al .…”

Section: Introductionmentioning

confidence: 99%

Local Electrodeposition of Metals by Tip Electrode Dissolution Using Scanning Electrochemical Microscopy

Lee

2018

Electroanalysis

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We have electrodeposited palladium and gold micropatternings using scanning electrochemical microscopy (SECM) with the metal precursor ions generated via anodic dissolution of the ultramicroelectrode (UME) tip itself. Concurrently, in‐situ reduction of the metal ions occurred at the substrate electrode, where the deposition parameters were optimized. In particular, this is the first direct Pd patterning using Pd dissolution without any mediators. The catalytic activities of oxygen reduction on the Pd or Au were studied with tip generation‐substrate collection mode of SECM. The possibility of simultaneous co‐deposition of Pd and Au was also demonstrated using a dual Pd and Au UME.

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Studying the localized deposition of Ag nanoparticles on self-assembled monolayers by scanning electrochemical microscopy (SECM)

Cited by 23 publications

References 46 publications

Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes

Micropipette Contact Technique as a Tool to Reveal, Characterize, and Modify Nanopore Electrodes

Parallel Imaging and Template‐Free Patterning of Self‐Assembled Monolayers with Soft Linear Microelectrode Arrays

Local Electrodeposition of Metals by Tip Electrode Dissolution Using Scanning Electrochemical Microscopy

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