Optical sensing of biological, chemical and ionic species through aggregation of plasmonic nanoparticles

Polavarapu, Lakshminarayana; Pérez‐Juste, Jorge; Xu, Qing‐Hua; Liz‐Marzán, Luis M.

doi:10.1039/c4tc01142b

Cited by 210 publications

(132 citation statements)

References 189 publications

(330 reference statements)

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“…The clusters can be efficiently used in sensors, 1 surface enhanced Raman scattering (SERS) [2][3][4][5] or organic photovoltaic devices. 6 Gold nanoparticles are excellent candidates for building bigger hierarchical structures, firstly because the size and shape can be well controlled.…”

Section: Introductionmentioning

confidence: 99%

Aggregation kinetics and cluster structure of amino-PEG covered gold nanoparticles

et al. 2016

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In this study controlled clustering kinetics is demonstrated for PEG grafted gold nanoparticles, in response to applied environmental stimuli; the temperature and ionic strength of the medium. It is also found that the rate of assembly determines the structure of the prepared clusters. After the system is brought out of equilibrium, time-dependent extinction and dynamic light scattering data are used to follow the evolution of nanoparticle cluster formation in real time. The results show that the rate of assembly increases with increasing ionic strength or temperature of the medium. As a result the nanoparticle cluster size scales with ionic strength and temperature, over a cluster size range from a few particle sizes up to the micron-scale. It is found that, even at the lowest ionic strength, the electric double layer repulsion is eliminated; hence the observed differences in kinetics and in cluster structure arise from modulation of the repulsive steric interactions between nanoparticles. The approach should be extendable to suspensions of other nanoparticle types, where the nanoparticle stability is determined by surface-grafted responsive macromolecules.

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Section: Introductionmentioning

confidence: 99%

Aggregation kinetics and cluster structure of amino-PEG covered gold nanoparticles

et al. 2016

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“…On the other hand, the Au NPs are not uniformly distributed over the MNP surfaces, which might result in a SERS intensity signal dependent on the region analyzed. Although the homogeneity of solid substrates for SERS has been tackled using distinct strategies [51][52][53], the SERS spectra shown here are representative of several regions analyzed that originated a Raman signal for PG.…”

Section: Resultsmentioning

confidence: 99%

SERS Detection of Penicillin G Using Magnetite Decorated with Gold Nanoparticles

2017

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Sensitive and reliable procedures for detecting vestigial antibiotics are of great relevance for water quality monitoring due to the occurrence of such emergent pollutants in the aquatic environment. As such, we describe here research concerning the use of multifunctional nanomaterials combining magnetic and plasmonic components. These nanomaterials have been prepared by decorating magnetite nanoparticles (MNP) with colloidal gold nanoparticles (Au NPs) of distinct particle size distributions. Several analytical conditions were investigated in order to optimize the surface enhanced Raman scattering (SERS) detection of penicillin G (PG) dissolved in water. In particular, the dependence of the SERS signal by using distinct sized Au NPs adsorbed at the MNP was investigated. Additionally, microscopic methods, including Raman confocal microscopy, were employed to characterize the SERS substrates and then to qualitatively detect penicillin G using such substrates. For example, magnetic-plasmonic nanocomposites can be employed for magnetically concentrate analyte molecules and their removal from solution. As a proof of concept, we applied magneto-plasmonic nanosorbents in the removal of aqueous penicillin G and demonstrate the possibility of SERS sensing this antibiotic.

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“…Several advantages can be obtained using AuNPs in aggregation based immunoassays such as simple preparation, good stability and easy read out Polavarapu et al, 2014). When a layer of protein complex or aggregates are adsorbed or bound specifically to an AuNP surface, the hydrodynamic diameter of the nanoparticle-protein complex will increase and this change in size of AuNP probes can be readily detected by dynamic light scattering (DLS) (Bogdanovic et al, 2010) (Fig.…”

Section: Aggregation Property Of Aunpsmentioning

confidence: 99%

Nanomaterials for early detection of cancer biomarker with special emphasis on gold nanoparticles in immunoassays/sensors

Devi

Doble

Verma

2015

Biosensors and Bioelectronics

169

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Optical sensing of biological, chemical and ionic species through aggregation of plasmonic nanoparticles

Cited by 210 publications

References 189 publications

Aggregation kinetics and cluster structure of amino-PEG covered gold nanoparticles

Aggregation kinetics and cluster structure of amino-PEG covered gold nanoparticles

SERS Detection of Penicillin G Using Magnetite Decorated with Gold Nanoparticles

Nanomaterials for early detection of cancer biomarker with special emphasis on gold nanoparticles in immunoassays/sensors

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