Surface coverage and size effects on electrochemical oxidation of uniform gold nanoparticles

Han, Donghyeop; Kim, Sung Soo; Kim, Yang Rae; Sohn, Byeong‐Hyeok; Chung, Taek Dong

doi:10.1016/j.elecom.2015.01.025

Cited by 14 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The downward anodic peaks in the scans are due to oxidation of Au by bromide mostly according to eq below, with some possible contribution from eq as well. The E p of 1.6, 4, and 15 nm-diameter Au NPs decreased as the size of the NPs decreased in the order of 1.6 nm ( E p = 0.45 V) < 4 nm ( E p = 0.69 V) < 15 nm ( E p = 0.77 V). This is consistent with experimental works by us ,, and others and theoretical works by Plieth and Henglein showing a negative shift in E p (and E 0 ) with decreasing NP size.…”

Section: Methodssupporting

confidence: 93%

“…The E p of 1.6, 4, and 15 nm-diameter Au NPs decreased as the size of the NPs decreased in the order of 1.6 nm (E p = 0.45 V) < 4 nm (E p = 0.69 V) < 15 nm (E p = 0.77 V). This is consistent with experimental works by us 35,36,38 and others 50 and theoretical works by Plieth 39 and Henglein 51 showing a negative shift in E p (and E 0 ) with decreasing NP size. Size Analysis by Electrochemical Surface Area-to-Volume (SA/V) Measurement.…”

Section: ■ Experimental Sectionsupporting

confidence: 92%

See 1 more Smart Citation

Effect of Size, Coverage, and Dispersity on the Potential-Controlled Ostwald Ripening of Metal Nanoparticles

Pattadar

Zamborini

2019

Langmuir

View full text Add to dashboard Cite

Here, we describe the size-dependent, electrochemically controlled Ostwald ripening of 1.6, 4, and 15 nm-diameter Au nanoparticles (NPs) attached to (3-aminopropyl)triethoxysilane (APTES)-modified glass/indium-tin-oxide electrodes. Holding the Au NP-coated electrodes at a constant negative potential of the dissolution potential in a bromide-containing electrolyte led to electrochemical Ostwald ripening of the different-sized Au NPs. The relative increase in the diameter of the NPs (D final/D initial) during electrochemical Ostwald ripening increases with decreasing NP size, increasing applied potential, increasing NP population size dispersity, and increasing NP coverage on the electrodes. Monitoring the average size of the Au NPs as a function of time at a controlled potential allows the measurement of the Ostwald ripening rate. Anodic stripping voltammetry and electrochemical determination of the surface area-to-volume ratio provide fast and convenient size analysis for many different samples and conditions, with consistent sizes from scanning electron microscopy images for some samples. It is important to better understand electrochemical Ostwald ripening, especially under potential control, since it is a major process that occurs during the synthesis of metal NPs and leads to detrimental size instability during electrochemical applications.

show abstract

Section: Methodssupporting

confidence: 93%

Section: ■ Experimental Sectionsupporting

confidence: 92%

Effect of Size, Coverage, and Dispersity on the Potential-Controlled Ostwald Ripening of Metal Nanoparticles

Pattadar

Zamborini

2019

Langmuir

View full text Add to dashboard Cite

show abstract

“…Halide ions are common in both environmental and physiological conditions, but additional ions are often present . Investigations into the oxidation mechanisms of bulk gold have observed oxoanion inhibition of chloridation and electrodissolution. ,, Research groups studying gold nanoparticle electrochemistry have primarily examined anodic processes in electrolyte solutions containing single anion species. ,− Gold nanoparticle oxidation in the presence of halide-oxoanion electrolytes has been demonstrated, but the role of the oxoanions was not examined. − …”

Section: Introductionmentioning

confidence: 99%

Electrodissolution Inhibition of Gold Nanorods with Oxoanions

et al. 2019

View full text Add to dashboard Cite

Metal nanoparticles experience varied chemical environments that can cause corrosion and dissolution in electronics, electrocatalysis, and sensing applications. Understanding oxidative dissolution is critical for plasmonic nanoparticles because their optical properties strongly depend on size and shape. We demonstrate that the addition of low relative concentrations of oxoanions to aqueous halide electrolyte solutions improves the morphological stability of plasmonic gold nanorods at anodic electrochemical potentials that otherwise induce complete oxidative electrodissolution. Single particle hyperspectral dark-field imaging and correlated scanning electron microscopy show that oxoanions alter the electrodissolution onset potential, electrodissolution pathway, and nanoparticle reaction heterogeneity, as compared to chloride-only electrolyte solutions. We identify five mechanistic contributors to the corrosion inhibition capabilities of oxoanions in the presence of chloride ions, with the aim of expanding the range of electrochemical sensing and catalysis applications for plasmonic metal nanoparticles. Of the contributors investigated, the pH, adsorption potential, and ionicity of the oxoanion are found to be the most influential factors, supporting the superior corrosion inhibition observed with bicarbonate and phosphate.

show abstract

“…Different techniques have been used to assemble AuNPs on various surfaces in which the stability of AuNPs, interface layer and the support surface are important for the self-organization. Han et al have demonstrated the growth of a single layer AuNPs film deposited on indium tin oxide (ITO) substrate without using an adhesive layer by utilizing diblock copolymer micelle and spin casting technique [18], while Acik et al reported in situ deposition of AuNPs on ITO and glass substrate by using spray pyrolysis (temperature range of 260–400 °C) [19]. Wu et al proposed AuNPs deposition by centrifugation where the thickness depended on centrifugation time [20].…”

Section: Introductionmentioning

confidence: 99%

Self-organization of gold nanoparticles on silanated surfaces

Kyaw¹,

Al-Harthi²,

Sellai³

et al. 2015

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

SummaryThe self-organization of monolayer gold nanoparticles (AuNPs) on 3-aminopropyltriethoxysilane (APTES)-functionalized glass substrate is reported. The orientation of APTES molecules on glass substrates plays an important role in the interaction between AuNPs and APTES molecules on the glass substrates. Different orientations of APTES affect the self-organization of AuNps on APTES-functionalized glass substrates. The as grown monolayers and films annealed in ultrahigh vacuum and air (600 °C) were studied by water contact angle measurements, atomic force microscopy, X-ray photoelectron spectroscopy, UV–visible spectroscopy and ultraviolet photoelectron spectroscopy. Results of this study are fundamentally important and also can be applied for designing and modelling of surface plasmon resonance based sensor applications.

show abstract

Surface coverage and size effects on electrochemical oxidation of uniform gold nanoparticles

Cited by 14 publications

References 22 publications

Effect of Size, Coverage, and Dispersity on the Potential-Controlled Ostwald Ripening of Metal Nanoparticles

Effect of Size, Coverage, and Dispersity on the Potential-Controlled Ostwald Ripening of Metal Nanoparticles

Electrodissolution Inhibition of Gold Nanorods with Oxoanions

Self-organization of gold nanoparticles on silanated surfaces

Contact Info

Product

Resources

About