Preparation of 1-D nanoparticle superstructures with tailorable thicknesses using gold-binding peptide conjugates

Hwang, Leekyoung; Chen, Chun-Long; Rosi, Nathaniel L.

doi:10.1039/c0cc02257h

Cited by 39 publications

(47 citation statements)

References 18 publications

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“…These observations are consistent with our previously reported studies. 26,30 We note that, in this method, in situ nanoparticle growth in the presence of the peptide conjugates is required to achieve ordered nanoparticle assemblies. 26 Cryogenic electron tomography (cryo-ET) was employed to determine the 3-D architecture of the single helices (Figure 2e,f).…”

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confidence: 99%

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

et al. 2016

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Chiral nanoparticle assemblies are an interesting class of materials whose chiroptical properties make them attractive for a variety of applications. Here, C18-(PEPAuM-ox)2 (PEPAuM-ox = AYSSGAPPMoxPPF) is shown to direct the assembly of single-helical gold nanoparticle superstructures that exhibit exceptionally strong chiroptical activity at the plasmon frequency with absolute g-factor values up to 0.04. Transmission electron microscopy (TEM) and cryogenic electron tomography (cryo-ET) results indicate that the single helices have a periodic pitch of approximately 100 nm and consist of oblong gold nanoparticles. The morphology and assembled structure of C18-(PEPAuM-ox)2 are studied using TEM, atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, circular dichroism (CD) spectroscopy, X-ray diffraction (XRD), and solid-state nuclear magnetic resonance spectroscopy (ssNMR). TEM and AFM reveal that C18-(PEPAuM-ox)2 assembles into linear amyloid-like 1-D helical ribbons having structural parameters that correlate to those of the single-helical gold nanoparticle superstructures. FTIR, CD, XRD, and ssNMR indicate the presence of cross-β and polyproline II (PPII) secondary structure. A molecular assembly model is presented that takes into account all experimental observations and that supports the single-helical nanoparticle assembly architecture. This model provides the basis for the design of future nanoparticle assemblies having programmable structures and properties.

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Section: Resultsmentioning

confidence: 99%

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

et al. 2016

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“…(12) We demonstrated that these strategies and methods are very useful for targeting, preparing, and tailoring the metrics and structural parameters of a diverse family of 1D gold nanoparticle superstructures, including chiral double helices(12, 25) and linear chains,(26) as well as a collection of discrete hollow spheres consisting of either gold(27, 28) or cobalt–platinum nanoparticles. (29) The precision of nanoparticle placement and the structural integrity of the resulting nanoparticle superstructures are key distinguishing features of this methodology.…”

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Tailorable Plasmonic Circular Dichroism Properties of Helical Nanoparticle Superstructures

et al. 2013

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We utilize a peptide-based methodology to prepare a diverse collection of double-helical gold nanoparticle superstructures having controllable handedness and structural metrics. These materials exhibit well-defined circular dichroism signatures at visible wavelengths owing to the collective dipole–dipole interactions between the nanoparticles. We couple theory and experiment to show how tuning the metrics and structure of the helices results in predictable and tailorable chirooptical properties. Finally, we experimentally and theoretically demonstrate that the intensity, position, and nature of the chirooptical activity can be carefully adjusted via silver overgrowth. These studies illustrate the utility of peptide-based nanoparticle assembly platforms for designing and preparing complex plasmonic materials with tailorable optical properties.

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“…We successfully demonstrated that this methodology addresses criteria 1 and 2 listed above. Specifically, we used this methodology to prepare a diverse set of complex gold nanoparticle superstructures, including double helices, [2] linear belts, [3] and hollow spherical structures, [4] and to tune the metrics of the superstructures. [5] In this contribution, we begin to address criterion 3 listed above.…”

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Peptide‐Directed Synthesis and Assembly of Hollow Spherical CoPt Nanoparticle Superstructures

2013

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Preparation of 1-D nanoparticle superstructures with tailorable thicknesses using gold-binding peptide conjugates

Abstract: We describe the preparation of new 1-D gold nanoparticle superstructures with tailorable thicknesses formed using a self-assembled gold-binding peptide conjugate template and examine how the synthesis and assembly mechanism impacts the organization of the superstructures.

Cited by 39 publications

References 18 publications

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

Peptide-Directed Assembly of Single-Helical Gold Nanoparticle Superstructures Exhibiting Intense Chiroptical Activity

Tailorable Plasmonic Circular Dichroism Properties of Helical Nanoparticle Superstructures

Peptide‐Directed Synthesis and Assembly of Hollow Spherical CoPt Nanoparticle Superstructures

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