A5090128743- 2D Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Nanowire Synthesis and Applications
- Advanced Memory and Neural Computing
- MXene and MAX Phase Materials
- Advancements in Transdermal Drug Delivery
- Photoreceptor and optogenetics research
- Ferroelectric and Negative Capacitance Devices
- Non-Invasive Vital Sign Monitoring
- Neuroscience and Neural Engineering
- Dielectric materials and actuators
- Textile materials and evaluations
- Thermoregulation and physiological responses
- Polymer composites and self-healing
- Advanced MEMS and NEMS Technologies
- Molecular Junctions and Nanostructures
- Whipple's Disease and Interleukins
- Urological Disorders and Treatments
- Tactile and Sensory Interactions
- Innovative Energy Harvesting Technologies
- Advanced Battery Technologies Research
- Renal Transplantation Outcomes and Treatments
- Inflammatory Bowel Disease
- Advanced battery technologies research
Northwestern University
2018-2024
University of California, Berkeley
2014-2018
Lawrence Berkeley National Laboratory
2014-2018
Material Sciences (United States)
2016
A flatter route to shorter channels High-performance silicon transistors can have gate lengths as short 5 nm before source-drain tunneling and loss of electrostatic control lead unacceptable leakage current when the device is off. Desai et al. explored use MoS 2 a channel material, given that its electronic properties thin layers should limit such leakage. transistor with 1-nm physical was constructed bilayer single-walled carbon nanotube electrode. Excellent switching characteristics an...
Two-dimensional (2D) transition metal dichalcogenides have emerged as a promising material system for optoelectronic applications, but their primary figure of merit, the room-temperature photoluminescence quantum yield (QY), is extremely low. The prototypical 2D molybdenum disulfide (MoS2) reported to maximum QY 0.6%, which indicates considerable defect density. Here we report on an air-stable, solution-based chemical treatment by organic superacid, uniformly enhances and minority carrier...
Gold-mediated exfoliation of ultralarge optoelectronically perfect monolayers with lateral dimensions up to ≈500 μm is reported. Electrical, optical, and X-ray photo-electron spectroscopy characterization show that the quality gold-exfoliated flakes similar tape-exfoliated flakes. Large-area allow manufacturing large-area mono-layer transition metal dichalcogenide electronics.
Early-stage organ transplant rejection can be difficult to detect. Percutaneous biopsies occur infrequently and are risky, measuring biomarker levels in blood lead false-negative -positive outcomes. We developed an implantable bioelectronic system capable of continuous, real-time, long-term monitoring the local temperature thermal conductivity a kidney for detecting inflammatory processes associated with graft rejection, as demonstrated rat models. The detects ultradian rhythms, disruption...
Monolithic 3D integrated circuits using transition metal dichalcogenide materials and low-temperature processing are reported. A variety of digital analog implemented on two sequentially layers devices. Inverter circuit operation at an ultralow supply voltage 150 mV is achieved, paving the way to high-density, ultralow-voltage, ultralow-power applications.
Precise form-fitting of prosthetic sockets is important for the comfort and well-being persons with limb amputations. Capabilities continuous monitoring pressure temperature at skin-prosthesis interface can be valuable in fitting process development dangerous regions increased as volume changes during daily activities. Conventional transducers sensors cannot provide comfortable, irritation-free measurements because their relatively rigid construction requirements wired interfaces to external...
Precise, quantitative measurements of the thermal properties human skin can yield insights into thermoregulatory function, hydration, blood perfusion, wound healing, and other parameters clinical interest. The need for wired power supply systems data communication hardware limits, however, practical applicability existing devices designed this type. Here, a set advanced materials, mechanics designs, integration schemes, wireless circuits is reported as basis wireless, battery-free sensors...
Stable n-doping of WSe2 using thin films SiNx deposited on the surface via plasma-enhanced chemical vapor deposition is presented. Positive fixed charge centers inside act to dope flakes n-type field-induced effect. The electron concentration in can be well controlled up degenerate limit by simply adjusting stoichiometry through process parameters. For high doping limit, Schottky barrier width at metal/WSe2 junction significantly thinned, allowing for efficient injection tunneling. Using...
Abstract Monitoring the composition, blood flow properties, and hydration status of human skin can be important in diagnosing disease tracking overall health. Current methods are largely limited to clinical environments, they primarily measure properties superficial layers skin, such as stratum corneum (10–40 µm). This work introduces soft, skin‐like thermal depth sensors (e‐TDS) designs that seamlessly couple with its sensitivity extend up 6 mm beneath surface. Guidelines for tailoring...
Smartphone-compatible, wireless, battery-free hydration sensors can monitor skin diseases in any environment.
Abstract Indwelling arterial lines, the clinical gold standard for continuous blood pressure (BP) monitoring in pediatric intensive care unit (PICU), have significant drawbacks due to their invasive nature, ischemic risk, and impediment natural body movement. A noninvasive, wireless, accurate alternative would greatly improve quality of patient care. Recently introduced classes skin‐interfaced devices offer capabilities continuous, precise physiologic waveforms vital signs neonatal patients,...
High-performance eco- and bio-resorbable magnesium–iodine batteries with >1.8 V output power cardiac pacemakers, wireless environmental monitors, thermal sensors, microcontrollers, Bluetooth systems.
Neurotransmitters and neuromodulators mediate communication between neurons other cell types; knowledge of release dynamics is critical to understanding their physiological role in normal pathological brain function. Investigation into transient neurotransmitter has largely been hindered due electrical material requirements for electrochemical stimulation recording. Current systems require complex electronics biasing amplification rely on materials that offer limited sensor selectivity...
Abstract Many recently developed classes of wireless, skin‐interfaced bioelectronic devices rely on conventional thermoset silicone elastomer materials, such as poly(dimethylsiloxane) (PDMS), soft encapsulating structures around collections electronic components, radio frequency antennas and, commonly, rechargeable batteries. In optimized layouts and device designs, these materials provide attractive features, most prominently in their gentle, noninvasive interfaces to the skin even at...
Partial cystectomy procedures for urinary bladder–related dysfunction involve long recovery periods, during which urodynamic studies (UDS) intermittently assess lower tract function. However, UDS are not patient-friendly, they exhibit user-to-user variability, and amount to snapshots in time, limiting the ability collect continuous, longitudinal data. These also pose risk of catheter-associated infections, can progress ascending pyelonephritis due prolonged manipulation high-risk patients....
Abstract The III–V compound semiconductors exhibit superb electronic and optoelectronic properties. Traditionally, closely lattice-matched epitaxial substrates have been required for the growth of high-quality single-crystal thin films patterned microstructures. To remove this materials constraint, here we introduce a mode that enables direct writing single-crystalline III–V’s on amorphous substrates, thus further expanding their utility various applications. process utilizes templated...
Significance Wireless electronics for monitoring of skin hydration in a quantitative fashion have broad relevance to our understanding dermatological health and structure both clinical home settings. Here, we present miniaturized, long-range automated system that adheres gently the yield recordings water content epidermis dermis. This supports capabilities characterizing barrier, assessing severity diseases, evaluating cosmetic medication efficacy, with high levels repeatability...
Layered 2D materials serve as a new class of substrates for templated synthesis various nanomaterials even with highly dissimilar crystal structures; thus overcoming the lattice constraints conventional epitaxial processes. Here, molybdenum disulfide (MoS 2 ) is used prototypical model substrate oriented growth in‐plane Au nanowires (NWs) despite nearly 8% mismatch between MoS and Au. NWs on surface are along three symmetrically equivalent directions within arising from strong Au–S binding...
Optical antennas can enhance the spontaneous emission rate from nanoemitters by orders of magnitude, enabling possibility an ultrafast, efficient, nanoscale LED. Semiconductors would be preferred material for such a device to allow direct high-speed modulation. However, efficient devices are challenging implement because high surface recombination typical most III–V materials. Monolayer transition metal dichalcogenides attractive alternative emitter due their intrinsically dimensions,...