Size-Dependent Electrochemical Metal Growth Kinetics

Nambiar, Harikrishnan N.

doi:10.1021/acs.jpcc.2c08879

Cited by 4 publications

(6 citation statements)

References 34 publications

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“…Removal of the imprinted AuNPs-MBA was accomplished by scanning the surfaces from 0.5 to 1.2 V in 0.1 M HCl, which is the potential window of Au oxidation , (Figure S11). The surface was scanned 10 times until the oxidation wave of AuNPs fully disappeared.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Hence, the strong peak of N � N stretching at 2308 cm −1 and C−N 2 stretch at 1124 cm −1 are absent due to the electrochemical reduction of ADS-COOH on the electrode, which involves N 2 cleavage and the formation of an aryl radical that reacts with the surface. 1,42 Removal of the imprinted AuNPs-MBA was accomplished by scanning the surfaces from 0.5 to 1.2 V in 0.1 M HCl, which is the potential window of Au oxidation 43,44 (Figure S11). The surface was scanned 10 times until the oxidation wave of AuNPs fully disappeared.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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High Recognition of Isomer-Stabilized Gold Nanoparticles through Matrix Imprinting

Zelikovich

Savchenko

Mandler

2023

ACS Appl. Mater. Interfaces

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The development of highly selective probes for nanoparticles is required due to their nanotoxicity. The latter strongly depends on the size, structure, and interfacial properties of the nanoparticles. Here, we demonstrate that a simple approach for the selective detection of Au nanoparticles that differ in their capping agent shows very high promise. Specifically, gold nanoparticles stabilized by each of the three different isomers of mercaptobenzoic acid (MBA) were imprinted in a soft matrix by adsorption of the nanoparticles, followed by filling the non-occupied areas through electropolyermization of an aryl diazonium salt (ADS). Nanocavities bearing the shape of the Au nanoparticles were formed upon the electrochemical dissolution of the nanoparticles, which were used for the reuptake of the Au nanoparticles stabilized by the different isomers. High reuptake selectivity was found where the originally imprinted nanoparticles were recognized better than the Au nanoparticles stabilized by other MBA isomers. Furthermore, an imprinted matrix by nanoparticles stabilized by 4-MBA could also recognize nanoparticles stabilized by 2-MBA, and vice versa. A detailed study using Raman spectroscopy and electrochemistry disclosed the organization of the capping isomers on the nanoparticles as well as the specific nanoparticle-matrix interactions that were responsible for the high reuptake selectivity observed. Specifically, the Raman band at ca. 910 cm −1 for all AuNP−matrix systems implies the formation of a carboxylic acid dimer and thus the interaction of the ligands with the matrix. These results have implications for the selective and simple sensing of engineered nanoparticles.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

High Recognition of Isomer-Stabilized Gold Nanoparticles through Matrix Imprinting

Zelikovich

Savchenko

Mandler

2023

ACS Appl. Mater. Interfaces

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“…25 Nambiar and Zamborini showed that the kinetics for Au electrodeposition from HAuCl 4 is faster on Au seed NPs compared to that on glass/ITO and that the rate of electrodeposition increased with decreasing Au NP size. 26 Song and co-workers electrodeposited Cu onto Ag nanocube seeds and followed the process by real-time single-particle imaging. 27 More recently, Ringe and co-workers electrodeposited Cu onto Au nanocube seeds, forming multilobed structures with tracking by dark-field scattering.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For example, Raj and John showed the growth of Au NRs on electrode surfaces using electrochemical seed-mediated approach on electrochemically formed Au seeds . Nambiar and Zamborini showed that the kinetics for Au electrodeposition from HAuCl 4 is faster on Au seed NPs compared to that on glass/ITO and that the rate of electrodeposition increased with decreasing Au NP size . Song and co-workers electrodeposited Cu onto Ag nanocube seeds and followed the process by real-time single-particle imaging .…”

Section: Introductionmentioning

confidence: 99%

Seed-Mediated Electrodeposition of Silver Nanowires and Nanorods

Shah,

Huang,

Nambiar

et al. 2024

Langmuir

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Here, we compare the amount and morphology of silver (Ag) nanostructures electrodeposited at varied potentials and times in the presence of cetyltrimethylammonium bromide (CTAB) onto glass/indium tin oxide (glass/ITO) electrodes functionalized with mercaptopropyltrimethoxysilane (MPTMS) and coated or not coated with 4 nm average diameter Au nanoparticle (Au NP) seeds. There is a significantly larger amount of Ag deposited on the seeded electrode surface compared to that in the nonseeded electrode at potentials of −150 to −300 mV (vs Ag/AgCl) since the Au NP seeds act as catalysts for Ag deposition. At more negative overpotentials of −400 to −500 mV, the amount of Ag deposited on both electrodes is similar because the deposition kinetics are fast enough on glass/ITO that the Au seed catalyst does not make as big of a difference. Ag nanorods (NRs) and nanowires (NWs) form on the seeded surfaces, especially at more positive potentials, where deposition primarily occurs on the Au seed catalysts. Deposition of Ag onto the Au seeds appears as a separate peak in the voltammetry. This procedure mimics the seed-mediated growth of Ag NRs observed in solution in the presence of CTAB using ascorbic acid as a reducing agent. The yield, length, and aspect ratio of the Ag NRs/NWs depend on the deposition time and potential with the average length ranging from 300 nm to 3 μm for times of 30−120 min and potentials of −150 to −200 mV. The electrochemical seed-mediated growth of Ag NRs/NWs across electrode gaps could find use for resistive and surface-enhanced Raman-based sensing and molecular electronic applications.

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“…). Electrochemical growth is another popular method for growing metal nanoparticles on semiconductor and conductive polymer surfaces specifically. − However, controlling the morphology and yield of anisotropic particles with electrochemical growth is still challenging. , …”

Section: Introductionmentioning

confidence: 99%

Growing Gold Nanostars on 3D Hydrogel Surfaces

Vinnacombe-Willson,

García-Astrain,

Troncoso-Afonso

et al. 2024

Chem. Mater.

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Nanocomposites comprising hydrogels and plasmonic nanoparticles are attractive materials for tissue engineering, bioimaging, and biosensing. These materials are usually fabricated by adding colloidal nanoparticles to the uncured polymer mixture and thus require time-consuming presynthesis, purification, and ligand-exchange steps. Herein, we introduce approaches for rapid synthesis of gold nanostars (AuNSt) in situ on hydrogel substrates, including those with complex three-dimensional (3D) features. These methods enable selective AuNSt growth at the surface of the substrate, and the growth conditions can be tuned to tailor the nanoparticle size and density (coverage). We additionally demonstrate proof-of-concept applications of these nanocomposites for SERS sensing and imaging. High surface coverage with AuNSt enabled 1−2 orders of magnitude higher SERS signals compared to plasmonic hydrogels loaded with premade colloids. Importantly, AuNSt can be prepared without the addition of any potentially cytotoxic surfactants, thereby ensuring a high biocompatibility. Overall, in situ growth becomes a versatile and straightforward approach for the fabrication of plasmonic biomaterials.

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Size-Dependent Electrochemical Metal Growth Kinetics

Cited by 4 publications

References 34 publications

High Recognition of Isomer-Stabilized Gold Nanoparticles through Matrix Imprinting

High Recognition of Isomer-Stabilized Gold Nanoparticles through Matrix Imprinting

Seed-Mediated Electrodeposition of Silver Nanowires and Nanorods

Growing Gold Nanostars on 3D Hydrogel Surfaces

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