Near Infrared Optical Absorption of Gold Nanoparticle Aggregates

Norman, Thaddeus J.; Grant, Christian D.; Magana, Donny; Zhang, Jin Z.; Li, Jun; Cao, D.; Bridges, F.; Buuren, Anthony Van

doi:10.1021/jp0204197

Cited by 257 publications

(280 citation statements)

References 33 publications

(74 reference statements)

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“…Although only a weak absorption near 780 nm is observed, SERS is still demonstrated to work effectively. This suggests that either the nanoparticles/aggregates absorbing at 780 nm are strongly SERS active due to their favorable surface chemistry or that the nanoparticles have further aggregated upon concentrating and drying for the SERS experiment, which may have caused a red-shift of the absorption band and increased absorption at 780 nm similar to what has been observed for gold nanoparticles [19]. The spectrum in Fig.…”

Section: Resultssupporting

confidence: 52%

Surface-enhanced Raman scattering detection of lysophosphatidic acid

2005

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Surface-enhanced Raman scattering using silver nanoparticles was applied to detect various forms of lysophosphatidic acid (LPA) to examine its potential application as an alternative to current detection methods of LPA as biomarkers of ovarian cancer. Enhancement of the Raman modes of the molecule, especially those related to the acyl chain within the 800-1300 cm −1 region, was observed. In particular, the C-C vibration mode of the gauche-bonded chain around 1100 cm −1 was enhanced to allow the discrimination of two similar LPA molecules. Given the molecular selectivity of this technique, the detection of LPA using SERS may eliminate the need for partial purification of samples prior to analysis in cancer screening.

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Section: Resultssupporting

confidence: 52%

Surface-enhanced Raman scattering detection of lysophosphatidic acid

2005

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“…[62] When Au nanoparticles are near each other in solution, an extended plasmon band can be observed that does not appear for isolated nanoparticles. [60] Proximity-induced plasmon coupling provides the basis for a nanoruler. [61,68] Magnetic coupling between nanoparticles may seem less of a surprise than electronic coupling.…”

Section: Proximity Effects -Impacts Of Separation Aggregation and Smentioning

confidence: 99%

Characterization challenges for nanomaterials

Baer

Amonette

Engelhard

et al. 2008

Surface & Interface Analysis

123

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Nanostructured materials are increasingly subject to nearly every type of chemical and physical analysis possible. Due to their small sizes, there is a significant focus on tools with high spatial resolution. It is also natural to characterize nanomaterials using tools designed to analyze surfaces, because of their high surface area. Regardless of the approach, nanostructured materials present a variety of obstacles to adequate, useful, and needed analysis. Case studies of measurements on ceria and iron metal-core/oxide-shell nanoparticles are used to introduce some of the issues that frequently need to be addressed during analysis of nanostructured materials. We use a combination of tools for routine analysis including X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and x-ray diffraction (XRD) and apply several other methods as needed to obtain essential information. The examples provide an introduction to other issues and complications associated with the analysis of nanostructured materials including particle stability, probe effects, environmental effects, specimen handling, surface coating, contamination, and time.

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“…Such nanoparticles exhibit different colours due to surface plasmon resonance effects which result from the resonance interaction of incoming electromagnetic radiation in the visible region with the collective plasmon oscillations at the metal surface [1]. This gives rise to intense absorptions in the visible spectrum.…”

Section: Introductionmentioning

confidence: 99%

Nanogold synthesis in wool fibres: novel colourants

Johnston

Lucas

2011

Gold Bull

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This paper presents the novel synthesis of gold nanoparticles of different sizes and hence colours in a wool fibre matrix, simultaneously utilising the chemical affinity of gold for sulfur to bind the nanogold to the disulfide linkages in cystine amino acids in the keratin protein. For this, the wool fibres act as a solid matrix to control the particle size and prevent agglomeration of the gold nanoparticles and hence facilitate a range of attractive colours in the wool due to the surface plasmon resonance effects of such gold nanoparticles. Because the nanogold is chemically bound to the cystine, it does not wash or rub out and is also stable to UV light, unlike organic colourants. The research innovatively links the high value and prestige of gold through nanoscience for high value textiles and fashion apparel, wherein the nanogold wool composite fibres contain only pure wool and pure gold and are environmentally desirable.

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Near Infrared Optical Absorption of Gold Nanoparticle Aggregates

Cited by 257 publications

References 33 publications

Surface-enhanced Raman scattering detection of lysophosphatidic acid

Surface-enhanced Raman scattering detection of lysophosphatidic acid

Characterization challenges for nanomaterials

Nanogold synthesis in wool fibres: novel colourants

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