To fabricate quantum dot arrays with programmable periodicity, functionalized DNA origami nanotubes were developed. Selected staple strands biotin-labeled to form periodic binding sites for streptavidin-conjugated dots. Successful formation of periods 43 and 71 nm demonstrates precise, programmable, large-scale nanoparticle patterning; however, limitations in array periodicity also observed. Statistical analysis AFM images revealed evidence steric hindrance or site bridging that limited the...

High-quality inverse-opal photonic crystals (see Figure) are formed by TiO2 infiltration and subsequent removal of SiO2 opal templates. Low-temperature atomic layer deposition followed annealing yields highly conformal infiltrations with extremely smooth surfaces (less than 1 nm root-mean-square roughness) filling fractions ∼ 88 %. Photonic-bandgap properties were determined using UV-vis reflectivity transmission measurements.

A novel approach is presented for the large-scale fabrication of ordered TiO2 nanobowl arrays. The process starts with a self-assembled monolayer polystyrene spheres, which used as template atomic layer deposition layer. After ion-milling, toluene-etching, and annealing TiO2-coated arrays nanostructured nanobowls have been fabricated. exhibit smooth interior exterior surfaces uniform sizes thickness. demonstrated to be useful selecting spheres smaller than inner diameter bowls. This can...

The relative electrochemical properties of second phases compared to the surrounding matrix gives rise localization corrosion on magnesium (Mg) alloys. Localized and its subsequent ...

A promising application of DNA self-assembly is the fabrication chromophore-based excitonic devices. brick assembly a compelling method for creating programmable nanobreadboards on which chromophores may be rapidly and easily repositioned to prototype new devices, optimize device operation, induce reversible switching. Using nanobreadboards, we have demonstrated each these functions through construction operation two different AND logic gates. The modularity high chromophore density...

DNA origami templated self-assembly has shown its potential in creating rationally designed nanophotonic devices a parallel and repeatable manner. In this investigation, we employ multiscaffold approach to fabricate linear waveguides of 10 nm diameter gold nanoparticles. This provides independent control over nanoparticle separation spatial arrangement. The were characterized using atomic force microscopy far-field polarization spectroscopy. work path toward large-scale plasmonic circuitry.

Coherent exciton delocalization in dye aggregate systems gives rise to a variety of intriguing optical phenomena, including J- and H-aggregate behavior Davydov splitting. Systems that exhibit coherent at room temperature are interest for the development artificial light-harvesting devices, colorimetric detection schemes, quantum computers. Here, we report on simple system templated by DNA exhibits tunable properties. At low salt concentrations, duplex with two internally functionalized Cy5...

Exciton delocalization in dye aggregate systems is a phenomenon that revealed by spectral features, such as Davydov splitting, J- and H-aggregate behavior, fluorescence suppression. Using DNA an architectural template to assemble aggregates enables specific control of the size type, proximal precise positioning dyes within aggregates, method for constructing large, modular two- three-dimensional arrays. Here, we report on organized via immobile Holliday junction template, exhibit large...

Abstract DNA is a compelling alternative to non-volatile information storage technologies due its density, stability, and energy efficiency. Previous studies have used artificially synthesized store data automated next-generation sequencing read it back. Here, we report digital Nucleic Acid Memory (dNAM) for applications that require limited amount of high redundancy, copy number. In dNAM, encoded by selecting combinations single-stranded with (1) or without (0) docking-site domains. When...

A simple method of making reliable electrical contact to multiwalled carbon nanotubes is described. With these contacts, current in the mA range can be routinely passed through individual without adverse consequences, thus allowing their resistance measured using a common multimeter. The contacts are robust enough withstand temperature excursions between room and 77 K. I(V) data from different presented analyzed.

Practical methods of microfabrication are vital for the development photonic-crystal-based signal processing. However, extension optical that dominate integrated circuit fabrication to three dimensions is challenging. This communication reports an essential step creation devices operating within a full photonic band gap: atomic layer deposition used create high-index TiO2 replicas holographically defined crystals shown in figure.

By coating patterned and aligned ZnO nanorod arrays with TiO2, a bottom–up process is used to fabricate 2D photonic crystal (PC). The as-synthesized PC slab shows highly ordered air-hole array (see Figure) exhibits bandgap that agrees reasonably well the theoretically calculated value.

Fluorescence resonance energy transfer (FRET) is a promising means of enabling information processing in nanoscale devices, but dynamic control over exciton pathways required. Here, we demonstrate the operation two complementary switches consisting diffusive FRET transmission lines which flow controlled by DNA. Repeatable switching accomplished removal or addition fluorophores through toehold-mediated strand invasion. In principle, these can be networked to implement any Boolean function.

Locked nucleic acids (LNAs) are conformationally restricted RNA nucleotides. Their increased thermal stability and selectivity toward their complements make them well-suited for diagnostic therapeutic applications. Although the structural thermodynamic properties of LNA-LNA, LNA-RNA, LNA-DNA hybridizations known, kinetic effects incorporating LNA nucleotides into DNA strand displacement systems not. Here, we thoroughly studied kinetics as a function number position in oligonucleotides. When...

DNA strand displacement systems have transformative potential in synthetic biology. While powerful examples been reported nanotechnology, such are plagued by leakage, which limits network stability, sensitivity, and scalability. An approach to mitigate leakage is applicable biology, introduce mismatches complementary fuel sequences at key locations. However, this method overlooks nuances the secondary structure of substrate that impact reaction kinetics systems. In an effort quantify on we...

DNA strand displacement networks are a critical part of dynamic nanotechnology and proven primitives for implementing chemical reaction networks. Precise kinetic control these is important their use in range applications. Among the better understood widely leveraged properties toehold sequence, length, composition, location. While steric hindrance has been recognized as an factor such systems, clear understanding its impact role lacking. Here, systematic investigation within toehold-mediated...

The electron emission and structural properties of an isolated ``rope'' comprised \ensuremath{\sim}70 individual single-walled nanotubes (SWNT's) were investigated by measuring the field-emission energy distributions using field-ion microscopy (FIM). Field-emission distributions, obtained under ultrahigh-vacuum conditions, revealed that emitting nanotube has a large density states near Fermi energy, with distribution emitted electrons close to predicted free-electron theory. Two small...

Lifetimes and operational performance were investigated for a DNA nanomachine linear probe in human serum blood to elucidate design principles future biomedical applications of DNA-based devices.

The excitonic circuitry found in photosynthetic organisms suggests an alternative to electronic circuits, but the assembly of optically active molecules fabricate even simple devices has been hampered by limited availability suitable molecular scale technologies. Here we have designed and operated a hybrid all-optical switch comprised donor/acceptor chromophores photochromic nucleotide modulators assembled with nanometer precision using DNA nanotechnology. was successfully both liquid solid...

Inverse opals with large connection pores were fabricated by infiltrating sintered polystyrene opal templates using low-temperature atomic layer deposition of $\mathrm{Ti}{\mathrm{O}}_{2}$ and subsequently dissolving the in toluene. The dielectric lattice, consisting overlapping air spheres a matrix, was then infiltrated nematic liquid crystal, some samples having received prior hydrophobic surface treatment. specular reflectance is shown to depend not only on electric-field amplitude, but...

Abstract A method is presented for predicting and precisely controlling the structure of photonic crystals fabricated using sacrificial‐layer atomic layer deposition. This technique provides a reliable fabrication high‐quality non‐close‐packed inverse shell opals with large static tunability precise structural control. By sacrificial during opal infiltration, inverse‐opal pore size can be increased sub‐nanometer resolution without distorting lattice to allow high degree dielectric...

A low-cost procedure is introduced for fabricating large-area, liftable, ordered TiO2 nanobowl sheets. The sheet made using the template of self-assembled polystyrene spheres, followed by atomic layer deposition (ALD), ion milling, and etching. By introducing a thin organic between nanobowls substrate, whole can be lifted-off in full size. dimension holes at bottom controlled additional ALD; thus, has been applied as reusable mask producing nanodot patterns with designed sizes. This...

Molybdenum sulfide films were grown by atomic layer deposition on silicon and fused silica substrates using molybdenum hexafluoride (MoF6) hydrogen at 200 °C. In situ quartz crystal microbalance (QCM) measurements confirmed linear growth 0.46 Å/cycle self-limiting chemistry for both precursors. Analysis of the QCM step shapes indicated that MoS2 is reaction product, this finding supported x-ray photoelectron spectroscopy showing Mo predominantly in Mo(IV) state. However, Raman diffraction...