A5025525447- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- Analytical Chemistry and Sensors
- Perovskite Materials and Applications
- Ionic liquids properties and applications
- Organic Light-Emitting Diodes Research
- Thermal properties of materials
- Transition Metal Oxide Nanomaterials
- Luminescence and Fluorescent Materials
- Advanced Sensor and Energy Harvesting Materials
- MXene and MAX Phase Materials
- Per- and polyfluoroalkyl substances research
- Acoustic Wave Resonator Technologies
- Electrochemical Analysis and Applications
- Composite Material Mechanics
- Histone Deacetylase Inhibitors Research
- Brain Metastases and Treatment
- Molecular Sensors and Ion Detection
- Advanced ceramic materials synthesis
- Advanced Battery Materials and Technologies
- Additive Manufacturing and 3D Printing Technologies
- Synthesis and biological activity
- Supercapacitor Materials and Fabrication
Stanford University
2020-2025
Georgia Institute of Technology
2017-2020
Abstract Modern computation based on von Neumann architecture is now a mature cutting-edge science. In the architecture, processing and memory units are implemented as separate blocks interchanging data intensively continuously. This transfer responsible for large part of power consumption. The next generation computer technology expected to solve problems at exascale with 10 18 calculations each second. Even though these future computers will be incredibly powerful, if they type...
Devices with tunable resistance are highly sought after for neuromorphic computing. Conventional resistive memories, however, suffer from nonlinear and asymmetric tuning excessive write noise, degrading artificial neural network (ANN) accelerator performance. Emerging electrochemical random-access memories (ECRAMs) display linearity, which enables substantially faster ANN training by array programing in parallel. However, state-of-the-art ECRAMs have not yet demonstrated stable efficient...
Abstract Synaptic devices with linear high‐speed switching can accelerate learning in artificial neural networks (ANNs) embodied hardware. Conventional resistive memories however suffer from high write noise and asymmetric conductance tuning, preventing parallel programming of ANN arrays. Electrochemical random‐access (ECRAMs), where occurs by ion insertion into a redox‐active channel, aim to address these challenges due their low noise. ECRAMs using 2D materials metal oxides slow kinetics,...
Organic mixed ionic-electronic conductors (OMIECs) have gained recent interest and rapid development due to their versatility in diverse applications ranging from sensing, actuation computation energy harvesting/storage, information transfer. Their multifunctional properties arise ability simultaneously participate redox reactions as well modulation of ionic electronic charge density throughout the bulk material. Most importantly, access states with deep through a large extent its physical...
Electronic transport models for conducting polymers (CPs) and blends focus on the arrangement of conjugated chains, while contributions nominally insulating components to are largely ignored. In this work, an archetypal CP blend is used demonstrate that chemical structure non-conductive component has a substantial effect charge carrier mobility. Upon diluting with excess insulator, as high 97.4 wt % insulator can display mobilities comparable some pure CPs such polyaniline low...
Operational stability underpins the successful application of organic mixed ionic-electronic conductors (OMIECs) in a wide range fields, including biosensing, neuromorphic computing, and wearable electronics. In this work, both operation p-type OMIEC material various molecular weights are investigated. Electrochemical transistor measurements reveal that device is very stable for at least 300 charging/discharging cycles independent weight, provided charge density kept below threshold where...
Abstract In organic mixed ionic–electronic conductors (OMIECs), it is critical to understand the motion of ions in electrolyte and OMIEC. Generally, focus on movement net charge during gating, neutral anion–cation pairs seldom considered. Uptake mobile ion by semiconductor before electrochemical gating (passive uptake) can be advantageous as this improve device speed, both participate compensation gating. Here, such passive pair uptake high‐speed solid‐state devices demonstrated using an gel...
Synthetic efforts have delivered a library of organic mixed ionic-electronic conductors (OMIECs) with high performance in electrochemical transistors. The most promising materials are redox-active conjugated polymers hydrophilic side chains that reach transconductances aqueous electrolytes due to volumetric charging. Current approaches improve transconductance and device stability focus mostly on chemistry including backbone chain design. However, other parameters such as the initial...
Electrochemical energy storage is a keystone to support the rapid transition low-carbon-emission future for grid and transportation. While research on electrochemical devices has mostly dealt with performance improvements (energy density power density), little attention been paid designing that can be recycled low cost environmental impact. Thus, next-generation should also address integration of recyclability into device design. Here, we demonstrate recyclable based solution-processable...
Abstract The true structure of alternating conjugated polymers—the state‐of‐the‐art materials for many organic electronics—often deviates from the idealized picture. Homocoupling defects are in fact inherent to widely used cross‐coupling polymerization methods. Nevertheless, polymers still perform excellently envisaged applications, which raises question if one should really care about these imperfections. This article looks at relevance chemical precision (and lack thereof) covering entire...
Perfluoroalkyls (PFAS) continue to emerge as a global health threat making their effective detection and capture extremely important. Though metal-organic frameworks (MOFs) have stood out promising class of porous materials for sensing PFAS, limits remain insufficient fundamental understanding mechanisms warrants further investigation. Here, we show the use 2D conductive MOF film based on copper hexahydroxy triphenylene (Cu-HHTP) fabricate chemiresistive devices detecting PFAS in drinking...
In the past two decades, organic electronic materials have enabled and accelerated a large diverse set of technologies, from energy-harvesting devices electromechanical actuators, to flexible printed (opto)electronic circuitry. Among (semi)conductors, mixed ion-electronic conductors (OMIECs) are now at center renewed interest in electronics, as they key drivers recent developments fields bioelectronics, energy storage, neuromorphic computing. However, due relatively slow switching dynamics...
The commercial uptake of (polymer-based) organic solar cells is among others hindered by poor reproducibility the device performance, arising from variability in molar mass distribution and presence structural defects push–pull conjugated polymers. Traditional "in-flask" synthesis methods commonly used catalysts contribute to these issues. Flow chemistry has been proposed provide consistent masses, while a recently applied Buchwald catalyst shows promise for reduced defect formation....
ABSTRACT To improve mechanical and thermal properties of a hexagonal boron nitride platelet filled polymer composites, maleic anhydride was studied as coupling agent compatibilizer. Injection molded blends acrylonitrile butadiene styrene (ABS), high‐density polyethylene (HDPE), with filler were tested for conductivity impact strength to determine whether adding improved interfacial interactions between matrix the polymers. Adding both HDPE ABS composite resulted in 40% improvement without...
Abstract Organic semiconductors have emerged as an attractive class of materials for neuromorphic computing applications, particularly in crossbar arrays artificial neural network (ANN) accelerators. Here, one the last persistent challenges facing organic adoption these applications is addressed by developing a fabrication process capable lithographically patterning vertical, three‐terminal electrochemical random‐access memories (ECRAMs). Central to realization this device architecture...
Dennis V. Christensen, Regina Dittmann, Bernabe Linares-Barranco, Abu Sebastian, Manuel Le Gallo, Andrea Redaelli, Stefan Slesazeck, Thomas Mikolajick, Sabina Spiga, Stephan Menzel, Ilia Valov, Gianluca Milano, Carlo Ricciardi, Shi-Jun Liang, Feng Miao, Mario Lanza, Tyler J. Quill, Scott T. Keene, Alberto Salleo, Julie Grollier, Danijela Markovic, Alice Mizrahi, Peng Yao, Joshua Yang, Giacomo Indiveri, John Paul Strachan, Suman Datta, Elisa Vianello, Alexandre Valentian, Johannes Feldmann,...
Perfluoroalkyls (PFAS) continue to emerge as a global health threat making their effective detection and capture extremely important. Though metal organic frameworks (MOF) have stood out promising class of porous materials for sensing PFAS, limits remain insufficient fundamental understanding mechanisms warrant further investigation. Here we show the use 2D conductive MOF film based on copper hexahydroxy triphenylene (Cu-HHTP) fabricate chemiresistive device detecting PFAS in drinking water....
Abstract Purpose Triple-negative breast cancer (TNBC) is an aggressive subtype that often metastasizes to the brain. Leptomeningeal disease (LMD), a devastating brain metastasis common in TNBC, has limited treatment options. We sought test whether anti-helminthic drug mebendazole (MBZ) may be effective against murine TNBC LMD. Methods A small-molecule screen involving cell lines identified benzimidazoles as potential therapeutic agents for further study. In vitro migration assays were used...
Abstract Purpose Triple-negative breast cancer (TNBC) often metastasizes to the central nervous system (CNS) and has highest propensity among subtypes develop leptomeningeal disease (LMD). LMD is a spread of into space that speeds up progression severely aggravates prognosis. limited treatment options. We sought test whether common anti-helminthic drug mebendazole (MBZ) may be effective against murine TNBC LMD. Methods A small-molecule screen involving cell lines identified benzimidazoles as...
State-of-the-art alternating semiconducting polymers, synthesized via established academic protocols, often contain homocoupling defects, causing the true structure to deviate from anticipated perfectly polymer backbone. These structural defects significantly hinder reproducibility across different batches, posing a challenge commercial viability of organic semiconductor field, while simultaneously imposing performance limitations in applications by creating defected chains, limiting...
Organic electrochemical transistors are extensively studied for applications ranging from bioelectronics to analog and neuromorphic computing. Despite significant advances, the fundamental interactions between polymer semiconductor channel electrolyte, which critically determine device performance, remain underexplored. Here, we examine coupling benchmark PEDOT:PSS ionic liquids explain bistable non-volatile behavior observed in OECTs. Using X-ray scattering spectroscopy techniques,...