category » Nanotechnology

Flexible High-Resolution Neural Recording Arrays
  • Lack of technology for high-throughput electronic recordings and simultaneous stimulation is a major limiting factor for the development of neuroprosthetics…


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Quantum Dot Light Emitting Diodes with an Electrophoretically Deposited Quantum Dot Layer
  • Quantum dot light emitting diodes (QD-LEDs) are promising devices for the next generation of solid-state lighting and other optoelectronic applications….


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Impact of Metal-induced Strain in InAlN/GaN Nanoribbons
  • Nitride transistors with current gain cut-off frequencies (fT) of 300 GHz and power gain cut-off frequencies (fmax) of 394 GHz…


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Graphene Infrared Photodetectors
  • Graphene is a two-dimensional (2D) material that has attracted great interest for electronic devices since its discovery in 2004 [1]…


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Preventing Catastrophic Failures: Nano-engineered Multi-physics Structural Damage Detection
  • Catastrophic structural failures cause many physical and personal losses, with prevention estimated at billions of dollars in savings each year….


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Aligned CNT-based Microstructures and Nano-engineered Composite Macrostructures
  • Carbon nanotube (CNT) composites are promising new materials for structural applications thanks to their mechanical and multifunctional properties. We have…


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Electrospray Nanoprinting on Electrospun Nanofiber Mats for Low-cost Biochemical Detection
  • An electrospray emitter ionizes polar liquids using high electrostatic fields. The electric field produces suction on the free surface (meniscus)…


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Optimization of Single- and Multi-wall Carbon Nanotube Growth on Nanoscale Zirconia and Other Oxides as Non-metallic Catalysts
  • This work focuses on the development of non-metallic substances that can catalyze carbon nanotube (CNT) growth while remaining in a…


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Nanoporous Elements in MEMS with a Focus on Microfluidic Bioparticle Separation
  • We integrated ultra-porous (99% porous) elements (nanoporous forests of vertically aligned carbon nanotubes (VACNTs)) in MEMS, showing their use in…


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An Analytical Approach for Characterizing the Complete Stress State in Thin-film CMOS Layered Materials and 3D MEMS Design via Postbuckling
  • Characterization of thin film layered materials is critical for many MEMS devices. Residual stresses from production determine both final shape…


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Growth of Vertically Aligned Carbon Nanotubes on a Continuously Moving Substrate
  • Vertically-aligned carbon nanotube (CNT) arrays are grown on a moving substrate, demonstrating continuous growth of nanoscale materials with long-range order….


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The Role of Hierarchical Morphologies in the High- performance Gas Sensing of CuO-Based Chemiresistors
  • Gas sensors are essential in the monitoring, control, and reduction of harmful emissions in the environment [1] .  Conductometric gas…


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Silicon Field Emitter Arrays for Chip-scale Vacuum Pumping
  • Development of miniature vacuum pumps that can be integrated with electronic or MEMS components is necessary for producing advanced equipment…


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Silicon Nanowires for Chemical Sensing Systems
  • Silicon nanowires (NWs) have attracted immense interest for sensing applications due to their high surface-to-volume ratio. In particular, field-effect-based chemical…


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Carbon Nanotube/Nanofiber Electrodes for High-energy Rechargeable Li-O2 Batteries
  • Recently, Li-O2 batteries have attracted much attention as potential next-generation alternatives to lithium-ion batteries for electric vehicle energy storage [1]…


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Fabrication of Si Nanowire-based Capacitors for Power Management
  • Capacitors with high capacitance density (capacitance per footprint area) have potential applications in autonomous microsystems and for power management in…


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Evolution of Intrinsic Stress and Grain Structure in Polycrystalline Films for Nano/Micro-electromechanical System Applications
  • Controlling the intrinsic stress in polycrystalline thin films is of great importance in a wide variety of applications, especially those…


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2D Crystals for Ubiquitous Electronics
  • Two-dimensional crystals, including graphene, hexagonal boron nitride, and transition metal dichalcogenides (TMD) materials, have outstanding properties for developing the next…


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Templated Self-assembly of Block Copolymers for Nanolithography
  • Self-organized macromolecular materials provide an alternative to conventional lithography for fabricating devices on the nanometer scale. Self-assembly of the microdomains…


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Heterogeneous Crystallization on Engineered Surfaces
  • Surfaces play a vital role in heterogeneous crystallization; surface properties such as chemistry, roughness and shape impact nucleation significantly [1]…


Quantum Hall Effect, Screening, and Layer-Polarized Insulating States in Twisted Bilayer Graphene
  • The bilayer 2-dimensional electron gas (2DEG) consists of two closely spaced 2DEGs, between which Coulomb interactions and tunneling effects can…


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Improved Carbon Nanotube Ultracapacitor Electrodes for Storage and Filtering
  • Due to their mechanical, thermal, and electrical properties and their natural ability to grow on a variety of metallic and…


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Simulation of Two-dimensional Core-shell Structures for Broadband Solar Cell Absorption
  • Solar cells with broadband absorption and large acceptance angle are demonstrated by using two-dimensional core-shell structures, which are composed of…


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Photonic Crystals on Erbium-doped Tellurite Thin Films for Broadband-enhanced Photoluminescence at near Infrared
  • Two-dimensional photonic crystals (PhCs) are fabricated using dual-beam focused ion beam (FIB) in Er3+-TeO2 thin films and demonstrate broadband enhancement…


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Synthesis of Monolayer Hexagonal Boron Nitride on Cu Foil using Chemical Vapor Deposition
  • Hexagonal boron nitride (h-BN) is very attractive for many applications, particularly as a protective coating, dielectric layer/substrate, transparent membrane, or…


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Graphene as Transparent Conducting Electrodes in Organic Photovoltaics: Studies in Graphene Morphology, Hole Transporting Layers, and Counter Electrodes
  • Due to the remarkable physical properties of graphene, applications in various areas such as transistors [1] , chemical sensors [2]…


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Hot Carrier-Assisted Intrinsic Photoresponse in Graphene
  • The photoresponse of semiconductors, which determines the performance of optoelectronic devices, is governed by energy relaxation pathways of photoexcited electron-hole…


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Studies of Light Extraction in GaN Nanowire-based Light-emitting Diodes
  • Nanowires are an exciting architecture for light emitting diodes (LEDs). To address the challenges of solid state lighting, III-V nitride…


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Stress State Characterization of InAlN/GaN Nanoribbon HEMT Structures using Convergent Beam Electron Diffraction
  • GaN-based high electron mobility transistors (HEMTs) are an important platform for the realization of high-power, high-frequency devices.  Nanoribbon (NR) HEMT…


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Superlattice-Source Nanowire FET with Steep Subthreshold Characteristics
  • Achieving a sharp subthreshold swing is crucial to enable the supply voltage scaling that is necessary to reducing power consumption…


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High-efficiency, Low-cost Photovoltaics using III-V on Silicon Tandem Cells
  • Photovoltaics and sustainability have received much attention lately. We seek a tandem photovoltaic device using silicon as both the substrate…


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ZnO Nanowire Arrays/Conductive Polymer Hybrid Solar Cells with Interfacial layer
  • Organic/inorganic hybrid solar cells based on the integration of conductive polymers into semiconducting nanowire arrays offer opportunities for the development…


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Decoupled Cantilever Arms for Highly Versatile and Sensitive Thermal Measurements
  • Microfabricated cantilever beams are used in microelectromechanical systems (MEMS) for a variety of sensor and actuator applications. Bimaterial cantilevers accurately…


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Recombination Dynamics of Charge Carriers in Nanostructured Solar Cells
  • Nanostructured solar cells are attracting increasing attention as a promising photovoltaic (PV) technology [1] . Generation of free charge carriers…


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Ligand Exchange for Performance Optimization of Lead Sulfide Quantum Dot Photovoltaics
  • Solar cells based on lead sulfide quantum dots (PbS QDs) represent a promising new class of solution-processable photovoltaics. The highly…


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Solution-Processed Nanowire-based Quantum Dot Photovoltaics
  • Thin-film solar cells incorporating colloidal quantum dot active layers have recently emerged as a notable third-generation photovoltaic (PV) technology, largely…


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Development of p-i-n Heterojunction Quantum Dot (QD) Solar Cells
  • Disordered semiconductors exhibit poor electronic transport properties due to their amorphous nature. Low carrier mobility and lifetime limits the diffusion…


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Solution Processed Bulk Heterojunction PbS:ZnO Solar Cells
  • Colloidal lead sulfide quantum dot (PbS QD) solar cells have recently shown attractive improvements in efficiency [1]. PbS QDs have…


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Understanding Modulation of Photocurrent with Applied Magnetic Field in Singlet Fission, Pentacene, Photodetectors
  • Organic solar cells and photodetectors that feature singlet exciton fission materials have two additional exciton processes that traditional organic solar…


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Nanotextured Silica Surfaces with Robust Superhydrophobicity and Omnidirectional Broadband Supertransmissivity
  • Natural biological surfaces have evolved to optimize their physicochemical properties and structures at the micro/nanoscale for a wide variety of…


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Aligned Sub-10-nm Block Copolymer Patterns Templated by Post Arrays
  • Topographic templates can be used for guiding the self-assembly of block copolymers to produce complex nanoscale patterns. In our previous…


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Top-down Templating of Protein Assembly: Complex Molecular Self-assembly Routes to Biological Device Fabrication
  • Templated assembly of biomolecules can create complex nanostructured devices with precisely tailored chemical or biological responses, with applications in, for…


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Investigating the Resolution Limits of 200-keV Electron-beam Lithography with an Aberration-corrected STEM
  • Electron-beam lithography (EBL) readily enables the fabrication of sub-10-nm features [1] . However, the resolution limits of this technique at…


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Cavity-integrated Ultra-narrow Superconducting Nanowire Single-photon Detector Based on a Thick Niobium Nitride Film
  • Superconducting nanowire single-photon detectors (SNSPDs) [1] , based on 100-nm-wide, ~ 4-nm‑thick niobium nitride (NbN) nanowires, are unmatched in sensitivity [2]…


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Removable Template for Block Copolymer Directed Self-Assembly
  • Self-assembled block copolymer structures are useful in nanolithography applications, producing patterns with high resolution and throughput. We previously showed control…


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Coupling Gold Nanoantennas to SNSPDs to Increase Mid-IR Detection
  • The system detection efficiency of systems integrated with superconducting nanowire single photon detectors (SNSPDs) has been limited to 24% due…


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CMP Slurry Abrasive Particle Agglomeration Modeling
  • Previously we proposed a particle agglomeration model for chemical mechanical planarization (CMP) with the primary motivation of understanding the creation…


Photoactuated Ultrafast Silicon Nanostructured Electron Sources for Coherent X-ray Generation
  • A collaboration of RLE and MTL investigators is creating the scientific and engineering knowledge for a compact coherent X-ray source…


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Ultra-Fast Pulsed High-Current Cold Cathodes with Temporal and Spatial Emission Uniformity
  • Field emission arrays (FEAs) are an attractive alternative to mainstream thermionic cathodes, which are power hungry and require high vacuum…