A5019228857- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Nanomaterials and Printing Technologies
- Carbon Nanotubes in Composites
- Nanowire Synthesis and Applications
- MXene and MAX Phase Materials
- 2D Materials and Applications
- Advancements in Battery Materials
- Analytical Chemistry and Sensors
- Microplastics and Plastic Pollution
- Membrane Separation Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Conducting polymers and applications
- Electrospun Nanofibers in Biomedical Applications
- Cardiac Arrest and Resuscitation
- 3D Printing in Biomedical Research
- Advanced Battery Technologies Research
- Thermal Radiation and Cooling Technologies
- Advanced battery technologies research
- Tactile and Sensory Interactions
- Neuroscience and Neural Engineering
- Thin-Film Transistor Technologies
- Electrohydrodynamics and Fluid Dynamics
- Semiconductor materials and devices
- Gas Sensing Nanomaterials and Sensors
Duke University
2018-2024
Northwestern University
2021-2023
University of California, Berkeley
2019
Durham Technical Community College
2019
Semiconducting carbon nanotubes (CNTs) printed into thin films offer high electrical performance, significant mechanical stability, and compatibility with low-temperature processing. Yet, the implementation of devices, such as CNT thin-film transistors (CNT-TFTs), has been hindered by relatively process temperature requirements imposed other device layers-dielectrics contacts. In this work, we overcome constraints demonstrate 1D-2D (1D-2D TFTs) in a (maximum exposure ≤80 °C) full...
Electrical biosensors, including transistor-based devices (i.e., BioFETs), have the potential to offer versatile biomarker detection in a simple, low-cost, scalable, and point-of-care manner. Semiconducting carbon nanotubes (CNTs) are among most explored nanomaterial candidates for BioFETs due their high electrical sensitivity compatibility with diverse fabrication approaches. However, when operating solutions at biologically relevant ionic strengths, CNT-based suffer from debilitating...
A water-based silver nanowire ink for the room temperature printing of highly conductive traces onto biological and nonplanar surfaces.
With molecularly well-defined and tailorable 2D structures, covalent organic frameworks (COFs) have emerged as leading material candidates for chemical sensing, storage, separation, catalysis. In these contexts, the ability to directly deterministically print COFs into arbitrary geometries will enable rapid optimization deployment. However, previous attempts been restricted by low spatial resolution and/or post-deposition polymerization that limits range of compatible COFs. Here, limitations...
Abstract Printed batteries are an emerging solution for integrated energy storage using low‐cost, high accuracy fabrication techniques. While several printed have been previously shown, few designed a battery that can be incorporated into device. Specifically, fully with small active electrode area (<1 cm 2 ) achieving areal capacities (>10 mAh −2 at current densities (1–10 mA has not demonstrated, which represents the minimum form‐factor and performance requirements many low‐power...
Semiconducting carbon nanotube (CNT) networks exhibit electrical, mechanical, and chemical properties attractive for thin-film applications, printing allows scalable economically favorable fabrication of CNT transistors (TFTs). However, device-to-device variation printed CNT-TFTs remains a concern, which largely stems from variations in morphology resulting properties. In this work, we overcome the challenges associated with uniformity demonstrate an aerosol jet process that yields devices...
Printing is a promising method to reduce the cost of fabricating biomedical devices. While there have been significant advancements in direct-write printing techniques, non-contact biological reagents has almost exclusively limited inkjet printing. Motivated by this lacuna, work investigated aerosol jet (AJP) onto nonfouling polymer brush fabricate vitro diagnostic (IVD) assays. The ultrasonication ink delivery process, which had previously reported damage DNA molecules, caused no...
Interest in flexible, stretchable, and wearable electronics has motivated the development of additive printing to fabricate customizable devices systems directly onto virtually any surface. However, progress been limited by relatively high temperatures (>200 °C) required sinter metallic inks time-consuming process steps, many which require removal substrate from printer for coating, washing, or sintering. In this work, we addressed these challenges demonstrate carbon nanotube thin-film...
Abstract Solution‐processed graphene is a promising material for numerous high‐volume applications including structural composites, batteries, sensors, and printed electronics. However, the polydisperse nature of dispersions following liquid‐phase exfoliation poses major manufacturing challenges, as incompletely exfoliated graphite flakes must be removed to achieve optimal properties downstream performance. Incumbent separation schemes rely on centrifugation, which highly energy‐intensive...
Abstract Three‐dimensional (3D) graphene microstructures have the potential to boost performance in high‐capacity batteries and ultrasensitive sensors. Numerous techniques been developed create such structures; however, methods typically rely on structural supports, and/or lengthy post‐print processing, increasing cost complexity. Additive manufacturing techniques, as printing, show promise overcoming these challenges. This study employs aerosol jet printing for creating 3D using water only...
Abstract Silver nanoparticles (NPs) are the most widely used conductive material throughout printed electronics space due to their high conductivity and low cost. However, when interfacing with other prominent materials, such as semiconducting carbon nanotubes (CNTs) in thin‐film transistors (TFTs), silver is suboptimal compared more expensive or less materials. Consequently, there would be significant value improving interface of CNT films. In this work, impact nanostructure morphology on...
Tailoring the properties of two-dimensional (2D) crystals is important for both understanding material behavior and exploring new functionality. Here we demonstrate alteration MoS2 metal-MoS2 interfaces using a convergent ion beam. Different beam energies, from 60 eV to 600 eV, are shown have distinct effects on optical electrical MoS2. Defects deformations created across different layers were investigated, revealing an unanticipated improvement in Raman peak intensity multilayer when...
Covalent bonding interactions determine the energy–momentum ( E – k ) dispersion (band structure) of solid-state materials. Here, we show that noncovalent can modulate near Fermi level a low-dimensional nanoscale conductor. We demonstrate low energy band gaps may be opened in metallic carbon nanotubes through polymer wrapping nanotube surface at fixed helical periodicity. Electronic spectral, chiro-optic, potentiometric, electronic device, and work function data corroborate magnitude gap...
Ion gel-based dielectrics have long been considered for enabling low-voltage operation in printed thin-film transistors (TFTs), but their compatibility with in-place printing (a streamlined, direct-write approach where devices never leave the printer mid- or post-process) remains unexplored. Here, we demonstrate a simple and rapid 4-step procedure producing electrolyte-gated carbon nanotube (CNT) at low temperature (80 °C). This process consists of use polymer-wrapped CNT inks channels,...
Abstract Liquid metals are ideally suited for flexible and wearable electronics due to their compatibility with additive manufacturing high electrical conductivity that is maintained following mechanical perturbation. While printing of eutectic gallium–indium (eGaIn) liquid metal nanoparticles has been demonstrated, previous techniques activating in the as‐printed insulating eGaIn limit throughput roll‐to‐roll processes. Here, ultrafast photonic sintering which further enhanced through use...
The research community has invested heavily in semiconducting two-dimensional (2D) materials, such as transition metal dichalcogenides (TMDs). Their stability when scaled down to a few atoms thick makes them attractive candidates replace or supplement silicon many future technologies. Although this sentiment is prevalent, demonstrations of 2D field-effect transistors (FETs) often do not present their data way that enables straightforward comparison. For example, some papers solely use...
Interest in point-of-care diagnostics has led to increasing demand for the development of nanomaterial-based electronic biosensors such as biosensor field-effect transistors (BioFETs) due their inherent simplicity, sensitivity, and scalability. The utility BioFETs, which use electrical transduction detect biological signals, is directly dependent upon stability detection-relevant environments. However, BioFET device structures vary substantially, especially electrode passivation modalities....
Tire tread wear is a significant vehicular safety concern; yet, monitoring depth (or thickness) still relies on manual detection, which rarely done by consumers and time-consuming for service lane technicians. In this paper, we present fully printed, one-dimensional electrode array that able to electrically measure the thickness profile of across width tire. The sensor consists printed millimeter-sized electrodes composed hybrid silver nanoparticle-carbon nanotube (CNT) structure. positioned...
Negative capacitance (NC) field-effect transistors (FETs) with 2-D semiconducting channels have become increasingly attractive due to their ability produce sub-60 mV/dec switching behavior in a physically scalable device. However, it has yet be determined how gate control, including threshold voltage, of NC-FETs is impacted by dielectric composition, along and ferroelectric layer thicknesses. Here, we show the voltage shifts positively under increasing thickness negatively thickness. This...
Abstract The rapid growth of electronic waste must be curtailed to prevent accumulation environmentally and biologically toxic materials, which are essential traditional electronics1. recent proliferation transient electronics has focused predominantly on biocompatibility(2,3), studies reporting material recapture have only demonstrated reuse conducting materials(4–6). Meanwhile, the ideal solution epidemic — all materials been largely neglected. Here we show complete recyclability in...