Nanoparticle beam formation and investigation of gold nanostructured films

Abstract

Articles you may be interested inRecording-media-related morphology and magnetic properties of crystalline CoPt3 and CoPt3-Au core-shell nanoparticles synthesized via reverse microemulsionThe object of the present work is the formation of a nearly collimated beam of gold nanoparticles with a high deposition rate and investigation of the resulting nanostructured gold film deposited onto ͑111͒ silicon substrates. The shape, size, and orientation of nanostructured gold crystals were analyzed by transmission electron microscopy and x-ray diffraction, and optical properties were investigated by ellipsometry. It was found that the optical properties of gold nanostructured films are completely different from the optical properties of conventionally deposited films reported in the literature. It was also found most crystals were grown on ͑111͒ plane with an indication of an expitaxial contact between the film and the substrate. The crystallite size was approximately 8 nm in diameter. High-resolution transmission electron microscopy also revealed that the gold nanophase crystals are cubo-octahedral with larger surface areas ͑octahedral part͒ at ͑111͒ orientation.

Metallic Conductive Luminescent Film

“…We measured the extinction spectra of the QD/SiO 2 @Au film in comparison to a pure Au film using the same electroless deposition, and the result is shown in Figure d. A broad feature of the extinction spectrum for a pure Au film can be observed (red line), which is in reasonably good agreement with the extinction feature of bulk-scale gold reported previously . In the QD/SiO 2 @Au film case, there is a stronger extinction peak at ∼530 nm superimposed on the extinction feature background, which is ascribed to the stronger localized surface plasmon resonance (LSPR) effect of the QD/SiO 2 @Au film due to the special embedding architecture.…”

Droplets to Merged Nanostructures: Evolution of Gold Nanostructures by the Variation of Deposition Amount on Si(111)

“…Up to now, various applications in optoelectronic, electrochemical, and electromechanical areas have been demonstrated utilizing nanowires fabricated using Au droplet catalysts. − For instance, blue LEDs, laser diodes, nanometric devices, FETs, energy-harvesting applications, and power electronic devices have been demonstrated with GaN nanowires owing to their wide bandgap and large exciton binding energy and piezoelectricity. − Likewise, wide-bandgap ZnO nanowires were utilized in FETs, LEDs, piezo-actuators, and biosensors. − Single-crystal triangular ZnO nanosheets were fabricated without stacking faults through catalyst-assisted growth beneath the Au droplets . In addition, Si nanowires based on the Au droplet catalysts exhibited great potential for thermoelectric applications, sensors, on-chip biomolecular filtering, and solar cells. − The fabrication of various nanowires through various epitaxial techniques has been extensively studied, − but systematic studies on the evolution and control of Au droplets and nanostructures are still insufficient. − As discussed, the Au droplets play critical roles in determining the size, density, and dimensions of droplet-assisted nanowires, which makes this study a critical research topic.…”

Fast, Simple, Combinatorial Routes to the Fabrication of Reusable, Plasmonically Active Gold Nanostructures by Interferometric Lithography of Self-Assembled Monolayers

“…After annealing, however, a strong plasmon peak may be observed. The average crystal size was calculated from the X-ray data using the Scherrer equation: where K is an instrumental constant, λ is the X-ray wavelength, β is the line broadening at half the maximum intensity in radians, and θ is the Bragg angle. The sizes of the gold crystals at the diffraction angles of 38.3° and 81.75° (one with the strongest reflected intensity) varied from ca .…”

“…The nanostructured gold films were modeled assuming Au to be semitransparent. The optical constants of the gold as well as thickness of the gold layer were modeled using the generalized oscillation layer summed with Drude oscillators. , The Cr layer and the BK7 glass substrate were also included in the model. The following discussion is focused on samples fabricated with values of ϕ of 90° and 60°.…”