Abstract:
Described herein are synthesis schemes and methods for producing silicon based nanostructures and materials, including compositions and methods for synthesis of silicon-based nanowires and composites from three-component and four-component liquid silane/polymer inks. Materials and methods for producing silicon based micro and nanofibers that can be used in a variety of applications including material composites, electronic devices, sensors, photodetectors, batteries, ultracapacitors, and photosensitive substrates, and the like.
Abstract:
Described herein are synthesis schemes and methods for producing silicon based nanostructures and materials, including compositions and methods for synthesis of silicon-based nanowires and composites from three-component and four-component liquid silane/polymer inks. Materials and methods for producing silicon based micro and nanofibers that can be used in a variety of applications including material composites, electronic devices, sensors, photodetectors, batteries, ultracapacitors, and photosensitive substrates, and the like.
Abstract:
An apparatus and a non-vapor-pressure dependent method of chemical vapor deposition of Si based materials using direct injection of liquid hydrosilane(s) are presented. Liquid silane precursor solutions may also include metal, non-metal or metalloid dopants, nanomaterials and solvents. An illustrative apparatus has a precursor solution and carrier gas system, atomizer and deposit head with interior chamber and a hot plate supporting the substrate. Atomized liquid silane precursor solutions and carrier gas moves through a confined reaction zone that may be heated and the aerosol and vapor are deposited on a substrate to form a thin film. The substrate may be heated prior to deposition. The deposited film may be processed further with thermal or laser processing.
Abstract:
Described herein are synthesis schemes and methods for producing silicon based nanostructures and materials, including compositions and methods for synthesis of silicon-based nanowires and composites from three-component and four-component liquid silane/polymer inks. Materials and methods for producing silicon based micro and nanofibers that can be used in a variety of applications including material composites, electronic devices, sensors, photodetectors, batteries, ultracapacitors, and photosensitive substrates, and the like.
Abstract:
An apparatus and non-vapor-pressure dependent methods of producing silicon particles such as nanoparticles (Si-NPs), quantum dots (Si-QDs) and Si-nanocrystals (Si-NCs) as well as particle embedded thin films are disclosed. Nano or micro scale droplets of a liquid silane composition are polymerized in a gas phase with heat or radiation to produce particles that are then collected. Droplets from a droplet generator pass through a flow channel with a reaction zone that is heated or irradiated to form the particles that are collected in a collector. The flow of droplets may be assisted with carrier or flow gases that may be heated. Liquid silane composition solutions may also include metal, non-metal or metalloid dopants and solvents. Particle surfaces can also be passivated or functionalized. Particles and droplets of liquid silane can also be co-deposited and heated to produce particle embedded thin films.
Abstract:
An aerosol deposition system that uses a liquid ink, fed directly to an ultrasonic source at or near a nozzle to form an aerosolized ink, which may be transported via a carrier gas to a sheath gas insertion location is presented. The sheath gas may direct or focus the atomized ink through a nozzle. Alternatively, a deposition head may be adapted to the ultrasonic source so that aerosolization of the ink occurs inside the deposition head, where the sheath gas flows around the ultrasonic source, transporting the aerosolized ink through a nozzle and toward a substrate ˜2 mm distant. The substrate may be translated to form features of controlled shape such as lines with widths from ≦30 μm to 100 μm. Variations of this system may yield systems where a carrier gas is unnecessary, and all aerosolized ink is transported via the sheath gas.
Abstract:
Methods for forming silicon thin films and structures with incorporated metals, non-metals, and combinations thereof, liquid precursor compositions useful in such methods, and silicon thin films and structures with embedded heteroatom(s) are described. The compositions are generally liquid at ambient temperature and are comprised of liquid silane(s) and have metal and/or non-metal additives. Metal and non-metal sources include organometallic and organic compounds, respectively. The compositions may also contain a solvent. The compositions may be processed by printing, coating, or spraying onto a substrate and subjected to UV, thermal, IR, and/or laser treatment to form silicon films or structures with embedded heteroatom(s).
Abstract:
Methods for producing surface functionalized silicon nanoparticles like Si-QDs using a continuous gas-phase synthesis by direct pyrolysis of aerosolized higher order liquid silanes like cyclohexasilane (Si6H12) or cyclopentasilane (Si5H10) to produce nanoscale particles are provided. The methods permit control over the particle characteristics i.e., crystallinity, core-shell, size and surface chemistry of Si nanostructures and allow the tuning of the band gap (absorption) and manipulation of photo responsive properties. A wide variety of modifications can be performed using the hydrogen (H) or hydroxyl (OH) groups attached to silicon atoms on the particle surface. The coupling of different molecules or complexes directly to the silicon atoms of the particles allows the engineering of desirable optical, chemical or biological activity to the particles or can act as linkers to agglomerate particles or form porous films.
Abstract:
A biodegradable soil sensor, a biodegradable soil sensing system and method for obtaining soil information is provided. The biodegradable sensor may include one or more electrically conductive bioinert traces and a biodegradable substrate having a printed circuit of the one or more electrically conductive bioinert traces. A biodegradable antenna may be formed by at least one of the one or more electrically conductive bioinert traces. A sensor may be connected to the one or more electrically conductive bioinert traces. The sensor may also include a biodegradable encapsulation layer housing the biodegradable substrate and the electrically conductive bioinert traces.
Abstract:
A biodegradable soil sensor, a biodegradable soil sensing system and method for obtaining soil information is provided. The biodegradable sensor may include one or more electrically conductive bioinert traces and a biodegradable substrate having a printed circuit of the one or more electrically conductive bioinert traces. A biodegradable antenna may be formed by at least one of the one or more electrically conductive bioinert traces. A sensor may be connected to the one or more electrically conductive bioinert traces. The sensor may also include a biodegradable encapsulation layer housing the biodegradable substrate and the electrically conductive bioinert traces.