Detection and Spectroscopy of Gold Nanoparticles Using Supercontinuum White Light Confocal Microscopy

Lindfors, Klas; Kalkbrenner, Thomas; Stoller, Patrick; Sandoghdar, Vahid

doi:10.1103/physrevlett.93.037401

Cited by 521 publications

(517 citation statements)

References 29 publications

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“…A supercontinuum laser was employed in a reflective dark-field geometry to collect far-field scattering spectra of individual structures (Fig. 1c) 36,37 . We obtained spectra from both individual ssDNA-coated NPs as well as single ssDNA-coated NPs attached to a flat DNA origami sheet and immobilized on a poly-(L)-lysine-coated glass slide.…”

Section: Resultsmentioning

confidence: 99%

DNA origami based assembly of gold nanoparticle dimers for surface-enhanced Raman scattering

et al. 2014

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Plasmonic sensors are extremely promising candidates for label-free single-molecule analysis but require exquisite control over the physical arrangement of metallic nanostructures. Here we employ self-assembly based on the DNA origami technique for accurate positioning of individual gold nanoparticles. Our innovative design leads to strong plasmonic coupling between two 40 nm gold nanoparticles reproducibly held with gaps of 3.3±1 nm. This is confirmed through far field scattering measurements on individual dimers which reveal a significant red shift in the plasmonic resonance peaks, consistent with the high dielectric environment due to the surrounding DNA. We use surface-enhanced Raman scattering (SERS) to demonstrate local field enhancements of several orders of magnitude through detection of a small number of dye molecules as well as short single-stranded DNA oligonucleotides. This demonstrates that DNA origami is a powerful tool for the high-yield creation of SERS-active nanoparticle assemblies with reliable sub-5 nm gap sizes.

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Section: Resultsmentioning

confidence: 99%

DNA origami based assembly of gold nanoparticle dimers for surface-enhanced Raman scattering

et al. 2014

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“…In the respective area, structures can be well aligned at the inherent precision of the piezo-stage (generally <10 nm). For optical detection, this microscope worked in the iSCAT mode 32 . This allowed highly sensitive detection of printed nanostructures and tight focussing (low view of depth).…”

Section: Methodsmentioning

confidence: 99%

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

et al. 2012

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nanotechnology, with its broad impact on societally relevant applications, relies heavily on the availability of accessible nanofabrication methods. Even though a host of such techniques exists, the flexible, inexpensive, on-demand and scalable fabrication of functional nanostructures remains largely elusive. Here we present a method involving nanoscale electrohydrodynamic ink-jet printing that may significantly contribute in this direction. A combination of nanoscopic placement precision, soft-landing fluid dynamics, rapid solvent vapourization, and subsequent self-assembly of the ink colloidal content leads to the formation of scaffolds with base diameters equal to that of a single ejected nanodroplet. The virtually material-independent growth of nanostructures into the third dimension is then governed by an autofocussing phenomenon caused by local electrostatic field enhancement, resulting in large aspect ratio. We demonstrate the capabilities of our electrohydrodynamic printing technique with several examples, including the fabrication of plasmonic nanoantennas with features sizes down to 50 nm.

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“…[24][25][26][27][28] Rayleigh scattering experiments can be performed by using two different strategies. In one, the background signal is minimized by making free-standing samples, as done in the case of carbon nanotubes, 27,28 or by dark-field configurations.…”

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confidence: 99%

Rayleigh Imaging of Graphene and Graphene Layers

et al. 2007

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We investigate graphene and graphene layers on different substrates by monochromatic and white-light confocal Rayleigh scattering microscopy. The image contrast depends sensitively on the dielectric properties of the sample as well as the substrate geometry and can be described quantitatively using the complex refractive index of bulk graphite. For a few layers (<6), the monochromatic contrast increases linearly with thickness. The data can be adequately understood by considering the samples behaving as a superposition of single sheets that act as independent two-dimensional electron gases. Thus, Rayleigh imaging is a general, simple, and quick tool to identify graphene layers, which is readily combined with Raman scattering, that provides structural identification.

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Detection and Spectroscopy of Gold Nanoparticles Using Supercontinuum White Light Confocal Microscopy

Cited by 521 publications

References 29 publications

DNA origami based assembly of gold nanoparticle dimers for surface-enhanced Raman scattering

DNA origami based assembly of gold nanoparticle dimers for surface-enhanced Raman scattering

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

Rayleigh Imaging of Graphene and Graphene Layers

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