Large-area periodic arrays of gold nanostars derived from HEPES-, DMF-, and ascorbic-acid-driven syntheses

Demille, Trevor B.; Hughes, Robert A.; Dominique, Nathaniel L.; Olson, Jacob E.; Rouvimov, Sergei; Camden, Jon P.; Neretina, Svetlana

doi:10.1039/d0nr04141f

Cited by 27 publications

(36 citation statements)

References 83 publications

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“…The pH sensitivity of organic acids' redox potentials allows for their use in seeded growth syntheses. Arguably the most utilized reducing agent for branching AuNPs, AA has been applied to form gold multipods, 36 stars, 74 urchins, 19 dendrites, 75 and more 26,76,77 and can be examined as a model for organic acid reductants. Work from our group has shown the facile room-temperature non-seeded synthesis of quasispherical gold particles by ascorbic acid as the sole reducing and capping agent.…”

Section: Reducing Agent Choicementioning

confidence: 99%

Bespoke nanostars: synthetic strategies, tactics, and uses of tailored branched gold nanoparticles

Siegel

Baker

2021

Nanoscale Adv.

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Section: Reducing Agent Choicementioning

confidence: 99%

Bespoke nanostars: synthetic strategies, tactics, and uses of tailored branched gold nanoparticles

Siegel

Baker

2021

Nanoscale Adv.

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“…Alternatively, substrate-immobilized NSs can be obtained from substrates hosting seed arrays. Demille et al recently demonstrated the synthesis of NSs using near-hemispherical Au structures as substrate-bound seeds . These seed structures were prepared from a template with cylindrical holes obtained by nanoimprint lithography, deposition of Au/Sb by sputtering, template lift-off, and thermal reshaping of the resulting disks into quasi-hemispheres with diameters of ca.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Gradient Arrays for Rapid Screening of Surface-Enhanced Raman Scattering Efficiency: Particle Libraries of Gold Nanostars

2021

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The efficiency of signal enhancement for surface-enhanced Raman scattering (SERS) spectroscopy is a crucial parameter for the design and development of nanoparticle-based sensing applications. However, screening SERS capabilities of anisotropic nanoparticles by iterative synthesis is time consuming, and their prediction still suffers from the complex nonlinear relationships of morphological and electromagnetic properties. We present an approach to use a macroscopic gradient array of substrate-supported nanoparticles for rapid screening of their SERS efficiencies. The gradient represents a “plasmonic library” of colloids synthesized by two-step post-modification of a monolayer of randomly close-packed gold nanospheres covered with poly(N-isopropylacrylamide) shells. A first chemical overgrowth process yields a continuous gradient of seed particles, with diameters ranging between 10 and 60 nm. Subsequently, the seeds are further grown into nanostars (NSs) with spiky tips, which improve their SERS-enhancing capabilities. Raman mapping along the gradient provides rapid and reliable quantification of the specific SERS efficiencies for the whole library, as well as correlation of their optical and structural properties. By ensuring that the number and density of particles in the Raman excitation volume remain constant, the most appropriate synthetic conditions for efficient SERS can be readily identified on a single screening. As a proof of application, we screened the SERS performance of a library of NSs and applied the selected best candidates for the detection of the bacterial biomarker pyocyanin. This bacterial quorum sensing signaling molecule was quantitatively detected within a linear dynamic range between 10–7 and 10–5 M, suitable for clinical applications.

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“…These deficiencies stimulate researchers to combine the physical fabrication technique and the chemical seed‐mediated growth for broadening the diversity of substrate‐supported Au NP morphology. [ 42 ] Yet, it is still hard for the substrate‐supported Au seeds to obtain reactants by the traditional growth process under room temperature, or conventional reductants such as ascorbic acid, leading to the failure of their sustained growth into Au NP with controllable morphology. Up to now, it is still of a great challenge to develop an effective route which not only makes the seeds maintain the original arrangement but also allows their controllable growth into more abundant substrate‐supported NPs.…”

Section: Introductionmentioning

confidence: 99%

Au Polyhedron Array with Tunable Crystal Facets by PVP‐Assisted Thermodynamic Control and Its Sharp Shape As Well As High‐Energy Exposed Planes Co‐Boosted SERS Activity

Zhang

Chen

et al. 2021

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A route is developed for directly growing 2D Au polyhedron arrays with controllable exposed facets of polyhedron by utilizing the substrate‐supported 2D Au quasi‐spherical nanoparticle arrays as the Au seed arrays, which cannot be realized by traditional lithography. In the reaction system, polyvinyl pyrrolidone (PVP) plays a vital role in guiding the reduced Au atoms and stabilizing the substrate‐supported Au seeds. More importantly, by thermodynamic control, PVP as a capping agent can further direct the formation of {111} facets. The key to guarantee the integrity and periodicity of array is a proper reduction of Au ions and low growth rate of crystal. Benefiting from the higher electric field intensity near the sharp vertexes and edges of Au polyhedra and the exposed {110} facets with high energy, the Au polyhedron array with {110} facets encasing polyhedron exhibits good, stable surface enhanced Raman scattering activity toward 4‐aminothiophenol among the involved arrays. The proposed fabrication approach tremendously enriches the structural diversity of Au nanoarrays on substrates and greatly overcomes the shortcoming of traditional lithography.

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Large-area periodic arrays of gold nanostars derived from HEPES-, DMF-, and ascorbic-acid-driven syntheses

Abstract: A method for the nanofabrication of periodic arrays of gold nanostars yielding a unique morphology of relevance to SERS applications.

Cited by 27 publications

References 83 publications

Bespoke nanostars: synthetic strategies, tactics, and uses of tailored branched gold nanoparticles

Bespoke nanostars: synthetic strategies, tactics, and uses of tailored branched gold nanoparticles

Plasmonic Gradient Arrays for Rapid Screening of Surface-Enhanced Raman Scattering Efficiency: Particle Libraries of Gold Nanostars

Au Polyhedron Array with Tunable Crystal Facets by PVP‐Assisted Thermodynamic Control and Its Sharp Shape As Well As High‐Energy Exposed Planes Co‐Boosted SERS Activity

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