A5074665837- Carbon Nanotubes in Composites
- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Nanowire Synthesis and Applications
- Analytical Chemistry and Sensors
- 2D Materials and Applications
- Advanced Memory and Neural Computing
- Nanomaterials and Printing Technologies
- MXene and MAX Phase Materials
- Airway Management and Intubation Techniques
- Atrial Fibrillation Management and Outcomes
- Neuroscience and Neural Engineering
- Diamond and Carbon-based Materials Research
- Inhalation and Respiratory Drug Delivery
- Electrohydrodynamics and Fluid Dynamics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Tactile and Sensory Interactions
- Respiratory Support and Mechanisms
- Microfluidic and Bio-sensing Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Mechanical and Optical Resonators
- Gas Sensing Nanomaterials and Sensors
- Interactive and Immersive Displays
- Cardiac, Anesthesia and Surgical Outcomes
- Dielectric materials and actuators
Duke University
2018-2024
The addition of surface acoustic wave (SAW) technologies to microfluidics has greatly advanced lab-on-a-chip applications due their unique and powerful attributes, including high-precision manipulation, versatility, integrability, biocompatibility, contactless nature, rapid actuation. However, the development SAW microfluidic devices is limited by complex time-consuming micro/nanofabrication techniques access cleanroom facilities for multistep photolithography vacuum-based processing. To...
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...
Thousands of reports have demonstrated the exceptional performance sensors based on carbon nanotube (CNT) transistors, with promises transformative impact. Yet, effect long-term bias stress individual CNTs, critical for most sensing applications, has remained uncertain. Here, we report ranges under which CNT transistors can operate continuously months or more without degradation. Using a custom characterization system, impacts defect formation and charge traps stability CNT-based extended...
With the growth of additive manufacturing (AM), there has been increasing demand for fabricating conformal electronics that directly integrate with larger components to enable unique functionality. However, fabrication is challenging because devices must merge host substrates regardless curvilinearity, topography, or substrate material. In this work, we employ aerosol jet (AJ) printing, an AM method printing using ink-based materials, and a custom-made lathe mechanism mounting flexible 3D...
Two-dimensional (2D) materials offer exciting possibilities for numerous applications, including next-generation sensors and field-effect transistors (FETs). With their atomically thin form factor, it is evident that molecular activity at the interfaces of 2D can shape electronic properties. Although much attention has focused on engineering contact dielectric in material-based to boost drive current, less understood about how tune these improve long-term stability devices. In this work, we...
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...
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...
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,...
Ionic gate dielectrics for all-printed CNT-TFTs show promise low-voltage operation and this work reveals important trade-offs in performance stability based on composition.
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....
Sensors based on two-dimensional (2D) field-effect transistors (FETs) are extremely sensitive and can detect charged analytes with attomolar limits of detection (LOD). Despite some impressive LODs, the operating mechanisms factors that determine signal-to-noise ratio in 2D FET-based sensors remain poorly understood. These uncertainties, coupled an expansive design space for sensor layout analyte positioning, result a field many reported highlights but limited collective progress. Here, we...
Although printed transistors have a wide range of applications, the limited resolution printing techniques (10-30 um) has been barrier to advancement and scaling, particularly down submicron dimensions. While previous works shown creative approaches realizing channel lengths with printing, reliance on chemical processes unique specific inks or tedious post-processing limit their applicability. Here, we report use capillary flow (CFP) repeatably create fully carbon nanotube thin-film...
For years, carbon nanotube (CNT) field- effect transistors (CNTFETs) have been promoted for their superb performance in sensing applications [1]. As hollow cylinders of sp2-bonded carbon, CNTs entire crystal structure exposed and thus are highly sensitive to local charge perturbations. CNTFET -based sensors typically require constant biasing the on-state duration operation, inducing both gate drain bias stress device. Reliable will detailed understanding effects this on device performance;...