We developed a simple method for highly ordered assemblies of gold nanoparticles (AuNPs) along DNA molecules on substrates, and achieved with well-aligned long-range order by using well-stretched templates. In addition, oxidized aniline-capped AuNPs (AN−AuNPs) prepared in this study were strongly attached to DNA. Two different assembly methods carried out, consequently continuous depositions necklace-like AN−AuNPs achieved.

The surface plasmon resonance peak due to Au nanoparticles dramatically increased after addition of AgClO4 into an aqueous dispersion without appearance Ag absorbance near 400 nm. dispersions has been found produce bimetallic silver−gold with a core−shell type structure. Ag-core/Au-shell configuration was suggested by the data from energy dispersive X-ray spectra prepared on high-resolution electron microscope. Moreover, catalytic activity for glucose oxidation investigated thus-prepared...

Specific identification of bacteria has been achieved through precisely transferred bacterial structure on the surface overoxidized polypyrrole (OPPy) film. The recognition target was successfully carried out in real time using OPPy film combination with dielectrophoresis. unique both techniques made specific detection template bacilli possible at concentrations as low 10(3) CFU/mL within 3 min, without any pretreatment. observation movement by a fluorescent microscope revealed that living...

Local molecular states and biological materials in small spaces ranging from the microscale to nanoscale can be modulated for medical applications using photothermal effect (PTE). However, there have been only a few reports on exploiting collective phenomena of localized surface plasmons (LSPs) increase amount light-induced heat control material generation macroscopic assembled structures. Here, we clarify that microbeads covered with vast number Ag nanoparticles induce large PTE generate...

Honeycomb substrate enables high-density light-induced assembly for enhancing energy conversion of electricity-producing bacteria.

The unique characteristics of biological structures depend on the behavior DNA sequences confined in a microscale cell under environmental fluctuations and dissipation. Here, we report prominent difference fluorescence from dye-modified single-stranded light-induced assembly DNA-functionalized heterogeneous probe particles microwell several microliters volume. Strong optical forces Mie scattering microparticles accelerated hybridization, photothermal effect localized surface plasmons gold...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLabel-Free Electronic Detection of DNA-Hybridization on Nanogapped Gold Particle FilmHiroshi Shiigi, Shiho Tokonami, Hidetaka Yakabe, and Tsutomu NagaokaView Author Information Research Institute Advanced Science & Technology, Osaka Prefecture University, 1-2 Gakuen, Sakai 599-8570, Japan, Faculty Engineering, Yamaguchi 2-16-1 Tokiwadai, Ube 755-8611, Japan Cite this: J. Am. Chem. Soc. 2005, 127, 10, 3280–3281Publication Date (Web):February...

A highly efficient natural light-harvesting antenna has a ring-like structure consisting of dye molecules whose absorption band changes through selective evolutionary processes driven by external stimuli, i.e., sunlight depending on its territory and thermal fluctuations. Inspired this fact, here, we experimentally theoretically demonstrate the assembling arrangements many silver nanorods with particular shapes orientations onto substrate light-induced force doughnut beams different colours...

We developed a rapid bacterial counting method based on the photothermal assembling (PTA). Based laser-induced PTA in fluid medium, an initial concentration was estimated from number of assembled bacteria. The measuring time our is 90 s, which more than conventional cultivation requiring several days at longest. Furthermore, difference between concentrations by and less 10%, sufficiently guarantees availability. clarified principle will pave way to high throughput assay useful for medical...

Abstract Macroscopic unique self-assembled structures are produced via double-stranded DNA formation (hybridization) as a specific binding essential in biological systems. However, large amount of complementary molecules usually required to form an optically observable structure natural hybridization, and the detection small amounts less than femtomole requires complex time-consuming procedures. Here, we demonstrate laser-induced acceleration hybridization between zeptomole-level...

Light-induced heating on a solid-liquid interface can generate vapor submillimeter bubble and fluid flow, which enables us to densely rapidly assemble dispersoids into desired position (photothermal assembly). Here, we revealed that the surface modulation of light-induced by surfactant dominates assembly dynamics nanoparticles microparticles as dispersoids, results in highly efficient photothermal under surfactant-controlled flow. This mechanism facilitate concentration measurement small...

Abstract Rapid evaluation of functions in densely assembled bacteria is a crucial issue the efficient study symbiotic mechanisms. If interaction between many living microbes can be controlled and accelerated via remote assembly, cultivation process requiring few days ommitted, thus leading to reduction time needed analyze bacterial functions. Here, we show rapid, damage-free, extremely dense light-induced assembly over submillimeter area with “bubble-mimetic substrate (BMS)”. In particular,...

Abstract The efficient detection of protein biomarkers is critical for public health. However, the sensitivity conventional antigen test kits relatively low early diagnosis, and laboratory immunoassays require complex pretreatment processes overnight. If target nanomaterials could be remotely guided to site, simpler faster methods would developed. Here, we reveal mechanism light-induced immunoassay that anti-spike-protein antibodies SARS-CoV-2 were coated on our developed...

We focused on changes in the electrical property of open bridge-structured gold nanoparticles array consisting 46-nm parent and 12-nm son by hybridization applied it for a simple DNA detection. Since target 24-mer oligonucleotide was added to probe modified Au nanoparticles, which arranged gap between particles, response read an readout system. Even measuring method, we obtained rapid cDNA with high S/N ratio 30 over wide concentration range detection limit 5.0 fmol. Moreover, discriminated...

A photothermal film (PTF) consisting of densely assembled gold nanoparticle-fixed beads (AuNP-FBs) on a low cost polymer substrate is successfully fabricated.

In our study, various bacteria, including Gram-negative (Pseudomonas aeruginosa, Escherichia coli, Acinetobacter calcoaceticus, Serratia marcescens, Shewanella oneidensis) and Gram-positive (Bacillus subtilis) were straightforwardly immobilized into the conducting polymers (CPs) by electrochemical deposition. The doping state of bacteria in polymer films (polypyrrole poly(3,4-ethylenedioxythiophene)) varied according to polymerization conditions. viability those adsorbed on substrates was...

We have developed a green electroless plating method, i.e., method that ensures the saving of resources and reduction emissions to environment, for formation conductive coating on micrometer-sized core beads. This has great advantages in practical applications because it uses self-assembling reaction between gold nanoparticles (AuNPs) are synthesized by combining nonhazardous reducing agent with nontoxic thiol binder. Moreover, does not require sophisticated instruments. In our study, beads...

A simple and highly sensitive detection of pathogenic bacteria is achieved by utilizing gold nanoparticles as an optical antenna.

Spin-orbit interaction is a crucial issue in the field of nanoscale physics and chemistry. Here, we theoretically demonstrate that spin angular momentum (SAM) can accelerate decelerate orbital motion nanoparticles (NPs) via light-induced interparticle interactions by circularly polarized optical vortex. The Laguerre-Gaussian beam as conventional vortex with (OAM) induces spinning trapped object depending on spatial configuration. On contrary, it not clear whether light for particles...

Plasmonic substrates have been extensively investigated due to their potential applications in fluorescence microscopy, chemical sensing, and photochemical reactions. The optical properties of the substrate depend on spatial temporal features plasmon excited. Hence, ability directly visualize dynamics is crucial. In this study, we excitation a plasmonic nanobowl consisting periodic hexagonal array nanoscale bowl-like structures developed with self-assembly. Near-field transmission imaging...