InterNano Nanomanufacturing Repository
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1523 research outputs found
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One-pot synthesis of hybrid TiO(2)-polyaniline nanoparticles by self-catalyzed hydroamination and oxidative polymerization from TiO(2)-methacrylic acid nanoparticles
No full textA simple self-catalyzed hydroamination method for creating hybrid TiO(2)-polyaniline core-shell nanoparticles (NP) has been shown. Hybrid NPs with a range of possible sizes are afforded in high yield under mild reaction conditions and simultaneously show improved charge transport and electrochromic behavior compared to either polyaniline alone or physically blended with TiO(2)
Confinement Effects on Chain Entanglement in Free-Standing Polystyrene Ultrathin Films
No full textA study of the confinement effects on chain entanglements in free-standing ultrathin (s100 nm) polymer films is presented. Chain entanglements are probed by determining the lifetime and breakup time scale of a branched network of suspended fibers formed from the annealing of these films. Films of polystyrene (between SO and 100 nm) cast via flow coating are suspended atop lithographically patterned arrays of pillars. The films are then annealed above the glass transition temperature, where holes are randomly formed. The holes expand exponentially due to capillary forces and impinge upon each other to form a suspended, branched network of fibers. The thinning of fibers as well as the lifetime and breakup of this fiber network is observed via optical microscopy. A model for the viscoelastic-capillary thinning of fibers can be applied to determine a time scale for the breakup of individual samples. The decay of this time scale, below a critical parent film thickness, shows a transition between interchain and self-entanglements when crossing into a confined regime, illustrating a significantly decreased interchain entanglement density and breakdown in the entangled network of the polymer melt. This analysis of confinement effects on chain entanglement extends the understanding of ongoing studies into suspended fiber formation from the melting of freestanding polymer thin films. A better knowledge of chain entanglements in confined systems will make future fabrication of nanoscale suspended fibers, new architectures, and subsequent devices more controlled and accessible
High spatial resolution characterization of silicon solar cells using thermoreflectance imaging
No full textStability of quantum dots in live cells
No full textQuantum dots are highly fluorescent and photostable, making them excellent tools for imaging. When using these quantum dots in cells and animals, however, intracellular biothiols (such as glutathione and cysteine) can degrade the quantum dot monolayer, compromising function. Here, we describe a label-free method to quantify the intracellular stability of monolayers on quantum dot surfaces that couples laser desorption/ionization mass spectrometry with inductively coupled plasma mass spectrometry. Using this new approach we have demonstrated that quantum dot monolayer stability is correlated with both quantum dot particle size and monolayer structure, with appropriate choice of both particle size and ligand structure required for intracellular stability
Direct photopatterning of light-activated gold nanoparticles
No full textPhotoactivatable gold NPs were patterned via photolithography. In this approach, charge reversal of the ligands on NPs upon UV irradiation induces crosslinking to generate stable NP patterns
Direct Fabrication of Functional and Biofunctional Nanostructures Through Reactive Imprinting
No full textOne-step reactive imprinting of a protected maleimide polymer provides a nanopatterned maleimide surface via a retro-Diels-Alder reaction. The patterned surfaces are used as scaffolds for the generation of functional and biofunctional structures. The biofunctional surface offers a platform for aligning the cells in the direction of patterns, demonstrating the potential for applications in the field of tissue engineering
National Nanomanufacturing Network Events 2011
No full textNanoinformatics 2011 brought together informatics experts, nanotechnology researchers, and other stakeholders and potential contributors to advance Nanoinformatics 2020 Roadmap goals. The workshop will set a clear path for Nanoinformatics participants through the presentation of projects and research, open discussions, and strategic planning sessions. The Nanomanufacturing Summit 2011 – showcased emerging areas of nanomanufacturing and commercialization of nanotechnology-enabled products by leaders in the field of nanomanufacturing
Sequential Electrodeposition of Platinum-Ruthenium at Boron-Doped Diamond Electrodes for Methanol Oxidation
No full textIntegrated nanosystems with junctionless crossed nanowire transistors
No full textJunctionless field-effect transistors (FETs) are promising emerging devices with simple doping profiles. In these devices, the channel is uniformly doped without the need for extremely good lateral doping abruptness or high thermal budget at source/channel and drain/channel junctions. This implies that device customization requirements are simplified compared to conventional enhancement-mode FETs. However, junctionless FETs have been discussed exclusively in the context of MOSFET replacement assuming other CMOS manufacturing, circuit and interconnect paradigms to be preserved intact. In this paper we argue for integration of junctionless devices into emerging nanofabrics. We propose junctionless crossed-nanowire FETs (xnwFETs) as the active devices for the Nanoscale Application Specific Integrated Circuits (NASICs) crossed nanowire fabric. We show that in addition to reducing customization requirements for individual nanodevices, the simpler device doping profile enables a scalable manufacturing pathway for NASICs where alignment and overlay requirements are minimized. In this pathway, a uniform 2-D nanowire grid may be assembled using unconventional or self-assembly based approaches without any overlay constraints. Overlay requirements exist only for subsequent photolithography steps, which is expected to be very precise (3σ = ±3.3nm for 16nm technology node)
