Assembly of Gold Nanoclusters on Silicon Surfaces

Maya, L.; Stevenson, Karen A.; Muralidharan, and Govindarajan; Thundat, Thomas; Kenik, E.A.

doi:10.1021/la011339h

Cited by 11 publications

(10 citation statements)

References 23 publications

(23 reference statements)

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“…Electrostatic attraction in weak acid solution (citric acid/sodium citrate, pH 4.5) and electrostatic repulsion in alkaline condition (Na 2 CO 3 /NaHCO 3 , pH 10.0) between the Au nanoparticles and templates were verified with AFM force curves ( Figure C,D). These results agree well with the previous literature in which electrostatic attractions were found between amino groups and gold nanoparticles decorated by carboxyl groups under weakly acidic conditions . Moreover, the forces between individual NBBs were evaluated with gold‐coated silicon nitride AFM probes modified by mercaptopropionic acid (MPA).…”

Section: Resultssupporting

confidence: 90%

Large‐Area 3D Hierarchical Superstructures Assembled from Colloidal Nanoparticles

Song

Yang

et al. 2019

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and covalent interaction [21] have been successfully developed. However, most of these approaches are applied to assemble NBBs into simple geometries (planes, [15] spheres, [19,20,22,23] and rods/wires [24] ) rather than complex 3D superstructures. This is because of the difficulties in either engineering the interactions between individual nanoparticles [18,23] or treating the complex effects caused by structure and micro-environment. [19,25,26] In addition, the domain size of the resulting assemblies is sometimes too small for practical applications. [27] Thus, organizing nanoparticles into superstructures with a diversity of morphologies on a macroscopic scale is critical yet still challenging.Template-traced assembly is an effective method for constructing 3D structures. [28] Of the reported templating methods, building blocks are usually trapped into nano/microgaps with high surface free energy or separated by a certain distance (tens to hundreds of nanometers) because of the inevitable repulsion between the identically charged building blocks. [29,30] This causes insufficient loading of NBBs on template surfaces and breaks the integrity of the 3D NBB assembly. Therefore, to achieve a continuous 3D NBB assembly, the interactions (e.g., electrostatic forces) between NBBs and templates should dominate the assembly process rather than the intrinsic properties (e.g., capillary force) of the templates. Enhancing the particle-particle binding (e.g., by hydrogen bonds (H-bonds)) and increasing the attraction between particles and templates are needed. Unfortunately, these would cause severe self-aggregation of nanoparticles in colloids. [31] Here, we designed an assembly method inspired by the fact that the double-layer citrate on the surface of Au nanospheres can stabilize Au nanosphere colloids in weakly acidic environment. [31,32] This is fulfilled by a steric hindrance generated by the outer citrate layer that covers the Au nanospheres. We used this steric hindrance to robustly balance loose assembly and random self-aggregation of NBBs. Dodecyl and double-layer citrate ligands were applied as steric hindrance, respectively, to increase the stability of the nanoparticle colloid when electrostatic forces and H-bonds were adjusted in the template/NBBs system (Figure 1). We chose butterfly wing scales-a group of chitin-based hierarchical photonic structure [33] -as structurally complex templates for NBB assembly. Through this method, Assembling nanosized building blocks into macroscopic 3D complex structures is challenging. Here, nanosized metal and semiconductor building blocks with a variety of sizes and shapes (spheres, stars, and rods) are successfully assembled into a broad range of hierarchical (nanometer to micrometer) assemblies of functional materials in centimeter size using butterfly wings as templates. This is achieved by the introduction of steric hindrance to the assembly process, which compensates for attraction from the environmentally sensitive hydrogen bonds and prevents the aggregation of nanosiz...

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Section: Resultssupporting

confidence: 90%

Large‐Area 3D Hierarchical Superstructures Assembled from Colloidal Nanoparticles

Song

Yang

et al. 2019

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“…The pH range of 5.0-6.0 coincides with the ionization range of the MSA bound to gold as established previously. 48 Also, the polymer has a pK a value of 10. To ensure a good electrostatic interaction, the solutions were prepared in phosphate buffer solution (PBS), pH 6.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Characterization of Polyelectrolyte/Gold Nanoparticle Multilayers Self-Assembled on Gold Electrodes

et al. 2005

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Polyelectrolyte/gold nanoparticle multilayers composed of poly(L-lysine) (pLys) and mercaptosuccinic acid (MSA) stabilized gold nanoparticles (Au NPs) were built up using the electrostatic layer-by-layer self-assembly technique upon a gold electrode modified with a first layer of MSA. The assemblies were characterized using UV-vis absorption spectroscopy, cyclic and square-wave voltammetry, electrochemical impedance spectroscopy, and atomic force microscopy. Charge transport through the multilayer was studied experimentally as well as theoretically by using two different redox pairs [Fe(CN) 6 ] 3-/4-and [Ru(NH 3 ) 6 ] 3+/2+ . This paper reports a large sensitivity to the charge of the outermost layer for the permeability of these assemblies to the probe ions. With the former redox pair, dramatic changes in the impedance response were obtained for thin multilayers each time a new layer was deposited. In the latter case, the multilayer behaves as a conductor exhibiting a strikingly lower impedance response, the electric current being enhanced as more layers are added for Au NP terminated multilayers. These results are interpreted quite satisfactorily by means of a capillary membrane model that encompasses the wide variety of behaviors observed. It is concluded that nonlinear slow diffusion through defects (pinholes) in the multilayer is the governing mechanism for the [Fe(CN) 6 ] 3-/4-species, whereas electron transfer through the Au NPs is the dominant mechanism in the case of the [Ru(NH 3 ) 6 ] 3+/2+ pair.

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“…Many efforts have been done recently to develop a range of strategies based on electrostatic interactions [18][19][20][21][22][23][24][25][26], biomolecular recognition [27][28][29] and covalent coupling [18,[30][31][32][33][34]. By varying the surface density of ionic sites which can be used as binding sites for metallic ions it may be possible to control the density and size of metal particles as well as to prevent the agglomeration of metal particles at the electrode surface [35].…”

Section: Introductionmentioning

confidence: 99%

Metallic and bimetallic Cu/Pt species supported on carbon surfaces by means of substituted phenyl groups

Vilà

Brussel

D’Amours

et al. 2007

Journal of Electroanalytical Chemistry

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Assembly of Gold Nanoclusters on Silicon Surfaces

Cited by 11 publications

References 23 publications

Large‐Area 3D Hierarchical Superstructures Assembled from Colloidal Nanoparticles

Large‐Area 3D Hierarchical Superstructures Assembled from Colloidal Nanoparticles

Electrochemical Characterization of Polyelectrolyte/Gold Nanoparticle Multilayers Self-Assembled on Gold Electrodes

Metallic and bimetallic Cu/Pt species supported on carbon surfaces by means of substituted phenyl groups

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