Probing Photoelectrochemical Processes in Au−CdS Nanoparticle Arrays by Surface Plasmon Resonance:  Application for the Detection of Acetylcholine Esterase Inhibitors

Zayats, Maya; Kharitonov, Andrei B.; Pogorelova, Svetlana P.; Lioubashevski, Oleg; Katz, Eugenii; Willner, Itamar

doi:10.1021/ja0379215

Cited by 179 publications

(126 citation statements)

References 49 publications

Supporting

Mentioning

124

Contrasting

Unclassified

Order By: Relevance

“…They measured the absorption spectra of the GNP monolayers in which GNPs were immobilized upon a glass slide by a functional organic coupling agent and found an optical response to polymers of different refractive indexes that were spin-cast on the immobilized GNPs [26]. Subsequently, a series of papers from different labs have presented this chip-based format optical biosensor, in which GNPs are immobilized on an optically transparent substrate [22,23,25,[45][46][47][48][49]. For instance, Matsui et al demonstrated a SPR sensor chip for detection of small molecules like dopamine [47].…”

Section: Gnp-based Optical Biosensorsmentioning

confidence: 99%

Gold nanoparticle-based biosensors

2010

View full text Add to dashboard Cite

The unique properties of gold nanoparticles have stimulated the increasing interest in the application of GNPs in interfacing biological recognition events with signal transduction and in designing biosensing devices exhibiting novel functions. The optical properties of GNPs provide wide range opportunities for construction optical biosensors. The excellent biocompatibility, conductivity, catalytic properties and high surface-to-volume ratio and high density of GNPs facilitate extensive application of GNPs in construction of electrochemical and piezoelectric biosensors with enhanced analytical performance with respect to other biosensor designs. In this article, the recent advances in construction of GNP-based optical, electrochemical and piezoelectric biosensors are reviewed, and some illustrative examples given, with a focus on the roles GNPs play in the biosensing process and the mechanism of GNPs for improving the analytical performances. Finally, the review concludes with an outline of present and future research for the real-world applications.

show abstract

Section: Gnp-based Optical Biosensorsmentioning

confidence: 99%

Gold nanoparticle-based biosensors

2010

View full text Add to dashboard Cite

show abstract

“…Hierarchical self-assembly of nanoparticles into a 2-D or 3-D superlattice facilitates manipulation of the structures with enhanced and tunable quantum confinement effects which opens up the possibilities of developing new classes of nanomaterials and devices with potential applications in light emitting diodes [2], Nano Res (2009) 2: 220 234 solar cells [3], molecular electronic architectures [4], high-density data storage [5], catalysis [6], biochemical sensors [7,8], biocompatible materials [9], and so on. The tremendous interest in particle superlattices is also driven by their already established applications in various fields resulting from the collective properties of the building blocks, which help us to understand electronic effects such as the metal-insulator transition and changes in magnetic and optical properties [10,11].…”

Section: Introductionmentioning

confidence: 99%

Fluorescent superlattices of gold nanoparticles: A new class of functional materials

et al. 2009

View full text Add to dashboard Cite

Fluorescent three-dimensional (3-D) superlattices of dansyl glutathione protected gold nanoparticles, with potential applications in molecular detection, have been synthesized at an air/water interface by controlling the pH of the nanoparticle suspension. The number of fl uorophores per nanoparticle was calculated to be ~127. Morphologies of the superlattice crystals were examined using scanning electron microscopy (SEM). Most of the crystals observed were triangular in shape. High-resolution transmission electron microscopy (HRTEM) and small angle X-ray scattering (SAXS) were used to study the packing of nanoparticles in these crystals. Both these studies showed that the nanoparticles were arranged in a face-centered cubic (fcc) pattern with a particle-particle distance (center-center) of ~10.5 nm. Evolution of the crystal morphologies with time was also examined. The fl uorescence properties of these triangles were studied using confocal fl uorescence imaging and confocal Raman mapping, which were in good agreement with the morphologies observed by SEM. The superlattice exhibits near-infrared (NIR) absorption in the range 1100-2500 nm. Easy synthesis of such functional nanoparticle-based solids makes it possible to use them in novel applications. We utilized the fl uorescence of dansyl glutathione gold superlattice crystals for the selective detection of bovine serum albumin (BSA), the major protein constituent of blood plasma, based on the selective binding of the naphthalene ring of the dansyl moiety with site I of BSA.

show abstract

“…C rystalline aggregates composed of one or more types of metallic and/or semiconductor nanoparticles (NPs) are of great interest for the development of new materials with potential applications in areas such as optoelectronics (1), high-density data storage (2), catalysis (3), and biological sensing (4). To date, methods for the crystallization of two-dimensional (2D) and 3D NP superlattices have relied on the differences in the sizes of component particles and on attractive van der Waals or hard-sphere interactions between them.…”

mentioning

confidence: 99%

“…Measurements on molecular hydrogen and deuterium agreed well with calculations of ultrafast nuclear dynamics in the H 2 þ molecule, confirming the validity of the method. We then measured harmonic spectra from CH 4 and CD 4 to demonstrate a fewfemtosecond time scale for the onset of proton rearrangement in methane upon ionization.…”

mentioning

confidence: 99%

“…It is known that the ionization of an atom or molecule by an intense laser field and subsequent electron acceleration in the field results in the formation of a chirped electron wavepacket-a Bburst[ of electrons with a broad range of kinetic energies that recollide with the parent ion over a range of time delays (4). However, the chirp of the electron wavepacket is a hitherto unexploited property in the measurement of ultrafast dynamical behavior.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Electrostatic Self-Assembly of Binary Nanoparticle Crystals with a Diamond-Like Lattice

Kalsin

Fiałkowski

Paszewski

et al. 2006

Science

882

881

View full text Add to dashboard Cite

Self-assembly of charged, equally sized metal nanoparticles of two types (gold and silver) leads to the formation of large, sphalerite (diamond-like) crystals, in which each nanoparticle has four oppositely charged neighbors. Formation of these non-close-packed structures is a consequence of electrostatic effects specific to the nanoscale, where the thickness of the screening layer is commensurate with the dimensions of the assembling objects. Because of electrostatic stabilization of larger crystallizing particles by smaller ones, better-quality crystals can be obtained from more polydisperse nanoparticle solutions.C rystalline aggregates composed of one or more types of metallic and/or semiconductor nanoparticles (NPs) are of great interest for the development of new materials with potential applications in areas such as optoelectronics (1), high-density data storage (2), catalysis (3), and biological sensing (4). To date, methods for the crystallization of two-dimensional (2D) and 3D NP superlattices have relied on the differences in the sizes of component particles and on attractive van der Waals or hard-sphere interactions between them. This strategy has been successful in preparing several types of lattices Esuch as AB (5), AB 2 (6), AB 5 (7), and AB 13 (6)^, but the all-attractive nature of the interparticle potentials limits its applicability to relatively few and usually (8) close-packed structures.To overcome this limitation, we and others (8, 9) have focused on systems of NPs interacting via electrostatic forces; such forces provide a basis for ionic, colloidal (9), or even macroscopic (10) crystals, but, despite promising attempts (8, 11), have not been successfully exploited for controllable or predictable long-range organization of matter at the nanoscale. Here, we report electrostatic self-assembly (10) (ESA) of oppositely charged, nearly equally sized metallic NPs of different types into large 3D crystals characterized by sphalerite (diamond-like) (12) internal packing, and of overall morphologies identical to those of macroscopic diamond or sphalerite crystals (Figs. 1 to 4). Formation of these nonclose-packed structures results from the change in electrostatic interactions in the nanoscopic regime, where the thickness of the screening layer becomes commensurate with the dimensions of the assembling particles, and is facilitated by the presence of smaller, charged NPs in the crystallizing solutions that stabilize larger NPs by what can be termed a nanoscopic counterpart of Debye screening.We used Ag and Au NPs coated with w-functionalized alkane thiols (13): HS(CH 2 ) 10 COOH (MUA) and HS(CH 2 ) 11 NMe 3 þ Cl j (TMA) (Fig. 1A). These NPs were prepared according to a modified procedure (14) Esee Supporting Online Material (15)^and had average diameters of 5.1 nm (with dispersity s 0 20%) for Au and 4.8 nm (s 0 30%) for Ag (Fig. 1B). We chose this pair as a model system, because the average sizes of Au NPs passivated with MUA Eself-assembled monolayer (SAM) thickness 0 1.63 nm (16)^and Ag NPs cov...

show abstract

Probing Photoelectrochemical Processes in Au−CdS Nanoparticle Arrays by Surface Plasmon Resonance: Application for the Detection of Acetylcholine Esterase Inhibitors

Cited by 179 publications

References 49 publications

Gold nanoparticle-based biosensors

Gold nanoparticle-based biosensors

Fluorescent superlattices of gold nanoparticles: A new class of functional materials

Electrostatic Self-Assembly of Binary Nanoparticle Crystals with a Diamond-Like Lattice

Contact Info

Product

Resources

About