Oriented assembly of Au nanorods using biorecognition system

Chang, Jia-Yaw; Wu, Huimeng; Chen, Hui; Ling, Yong‐Chien; Wang, Tan

doi:10.1039/b414059a

Cited by 233 publications

(165 citation statements)

References 16 publications

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“…It is consistent with the previous reports that the longitudinal band of GNRs is more sensitive to the local environment around GNRs than the transverse band [42][43][44][45]. This result suggested that the aggregation of GNRs takes place in a side-by-side manner [46,47].…”

Section: +supporting

confidence: 82%

Colorimetric assay of lead using unmodified gold nanorods

et al. 2012

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Lead poisoning in adults can affect the peripheral and central nervous systems, the kidneys, and blood pressure. Thus, the development of environment-friendly and simple methods for Pb 2+ detection is of great importance. Herein, a label-free colorimetric method has been developed for the detection of Pb 2+ based on the conformational switch from single-stranded DNA to G-quadruplex. The electrostatic interactions between DNA probe and gold nanorods (GNRs) induce GNRs to space closely. However, the electrostatic interaction is not strong enough to change the suspension state of GNRs. In the presence of Pb 2+ , the formation of G-quadruplexes increases the surface charge density around DNA, which is expected to strengthen the electrostatic interaction between the GNRs and the DNA. Therefore, the longitudinal absorption of GNRs decreased because the stronger interaction induced aggregation of GNRs. Importantly, the decrease in longitudinal absorption is proportional to concentration of Pb 2+ . By monitoring the change of absorbance, Pb 2+ can be detected at a level of 3 nM with a linear range from 5 nM to 1 μM. The overall test only takes a few minutes and very little interference is observed from other metal ions. The major advantages of this method are its low cost, convenience, simplicity, sensitivity, and specificity.

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Section: +supporting

confidence: 82%

Colorimetric assay of lead using unmodified gold nanorods

et al. 2012

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“…Since θ is not singular at the critical line, we can assume that the singular part of the free energy will make no contribution to Eq. (34) and therefore the derivative of the second term in the right hand of the previous expression vanishes when n → ∞. Therefore, we can express…”

Section: Rsrg Coverage Calculationmentioning

confidence: 99%

“…Selectively functionalizing the ends of hydrophilic nanorods with hydrophobic polymers, Nie et al reported the observation of rings, bundles, chains, and bundled chains [33]. In another experimental study carried out by Chang et al [34], gold nanorods were assembled into linear chains using a biomolecular recognition system. In a direct relation with the present work, Clair et al [35] investigated the self-assembly of terephthalic acid (TPA) molecules on the Au(111) surface.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of self-assembled rigid rods on two-dimensional lattices: Theory and Monte Carlo simulations

López

Linares

Ramírez-Pastor

et al. 2010

The Journal of Chemical Physics

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Monte Carlo simulations and finite-size scaling analysis have been carried out to study the critical behavior in a two-dimensional system of particles with two bonding sites that, by decreasing temperature or increasing density, polymerize reversibly into chains with discrete orientational degrees of freedom and, at the same time, undergo a continuous isotropic-nematic (IN) transition. A complete phase diagram was obtained as a function of temperature and density. The numerical results were compared with Mean Field (MF) and Real Space Renormalization Group (RSRG) analytical predictions about the IN transformation. While the RSRG approach supports the continuous nature of the transition, the MF solution predicts a first-order transition line and a tricritical point, at variance with the simulation results.

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“…Such partial coating has been shown to favor assembly into side-by-side or end-to-end geometries, leading to superstructures with different degree of organization, complexity of collective behavior and unique optical properties. By taking advantage of interactions between small organic molecules [101] , polymers [102] , or biomolecules such as DNA [103] , oligonucleotides [104] or proteins (antibody -antigen [105] or biotin -strepavidin interactions [106] ), end-to-end and side-to-side assemblies of gold NRs have been successfully used for sensing applications [104,107] .…”

Section: Physically Adsorbed Polymersmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

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An essential element in the synthesis of nanomaterials based on gold nanoparticles comprises the control over parameters such as size, shape and composition, due to their strong infl uence on the properties of the particles. However, it is the coating material which often plays the primary role in tuning the size, morphology, and even plasmon resonance wavelength or mode multiplicity, as well as colloidal stability and functional versatility, ultimately determining the physical, chemical, optical, electronic and catalytic properties of the nanoparticles. Therefore, it is utterly important to select the adequate wet chemistry synthetic approach with the most suitable coating material for the preparation of gold nanoparticles with the desired requirements. Within this context, this review is focused on describing various types of organic and inorganic coating materials for gold nanoparticles that may notably affect their optical properties by either directly infl uencing the synthesis procedure or by changing their chemical and physical properties upon post-synthetic modifi cations, such that they exhibit novel and useful optical properties.

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Oriented assembly of Au nanorods using biorecognition system

Cited by 233 publications

References 16 publications

Colorimetric assay of lead using unmodified gold nanorods

Colorimetric assay of lead using unmodified gold nanorods

Phase diagram of self-assembled rigid rods on two-dimensional lattices: Theory and Monte Carlo simulations

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

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