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Institute for Electronics and Nanotechnology (IEN)

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Advancements in Photonics for Radio Frequency Electronics Systems

2019-12-10 , Yang, Benjamin

The application of photonics for the processing of radio frequency (RF) systems offer many potential advantages, such as low signal transport loss, large operating bandwidth, and potentially low size, weight, and power (SWaP) form factors. While investments from the telecommunications industry have matured the basic building blocks in radio frequency photonics and photonic integrated circuit technology, insertion of these advances into modern radio frequency systems requires solving additional unique challenges. The Georgia Tech Research Institute’s (GTRI) photonics team is researching solutions to successfully insert RF photonics in fielded electronic systems and broaden the technology impact beyond telecommunications. This seminar will cover three objectives: 1) introduce the Institute for Electronics and Nanotechnology (IEN) community to GTRI and select topics of its photonics research portfolio; 2) examine advantages and challenges of both discrete and integrated photonics from an RF electronic systems perspective; 3) survey architectures, systems, and components under collaborative development between the Georgia Tech Research Institute, Georgia Tech Electrical and Computer Engineering, and external partners. We will conclude by discussing capabilities under development that can expand IEN’s competencies and explore paths toward broader collaboration across Georgia Tech.

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3D Multi-Electrode Arrays Fabricated on Flexible Substrate Enabled Single-Unit Recordings of Muscle Activity

2019-10-10 , Zia, Muneeb , Chung, Bryce

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Applications of Molecular Dopants and Interface Modifiers for Electronic and Opto-Electronic Applications

2019-10-08 , Marder, Seth R.

Organic, hybrid, and 2D materials have attracted interest for electronic applications due to their potential for use in low-cost, large-area, flexible electronic devices. Here we will report on recent developments pertaining to surface modifiers and dopants that could impact the charge injection/collection/transport processes in organic light emitting diodes, organic field effect transistors, and photovoltaic devices. In particular, we will examine how N-heterocylic carbenes assemble on gold substrates, the impact of the surface dipole on the work function of the gold. We will also discuss the development of metallocenes-based dimers as n-dopants and very briefly describe metal dithiolene complexes as p-dopants for organic semiconductors and their impact of device performance.

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Materials by Design: Three-Dimensional (3D) Nano-Architected Meta-Materials

2019-09-06 , Greer, Julia

2019 James D. Meindl Distinguished Lecturer.

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Atmospheric Organic Aerosols: Sources, Chemistry, and Health Impacts

2019-11-26 , Ng, Nga Lee

Organic aerosols constitute a significant fraction of submicron fine particulate matter (PM) in the atmosphere. Secondary organic aerosols (SOA) formed from condensation of low-volatility species produced by oxidation of gas-phase organic compounds often dominate the mass of atmospheric organic aerosols. Understanding the formation of SOA has proven to be a challenge owing to the difficulty in identifying and quantifying all the gas-phase precursors as well as the complex, multi-generation oxidative chemistry that leads to the aerosol formation. Laboratory chamber experiments provide the basic understanding needed for predicting SOA formation. Ambient field measurements provide important datasets for understanding the chemistry and life cycles of atmospheric aerosols. In this work, we employed an integrated laboratory and field measurement approach to investigate how emissions from human activities (e.g., SO2, NOx) interact with emissions from trees in the formation of SOA. We will also discuss oxidative stress induced by laboratory and ambient aerosols for understanding their impacts on human health upon exposure.

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Wireless, Stretchable Hybrid Electronics for Smart and Connected Physiological Monitoring

2019-10-10 , Yeo, Woon-Hong

The goal of Dr. Yeo’s research is to understand fundamentals of soft materials, deformable mechanics, biological interface forces, and nanomanufacturing methods for development of stretchable hybrid biosensors and bioelectronics. The comprehensive study of mechanics, materials, and manufacturing for biosystems aims to advance human healthcare, disease diagnostics, therapeutics, and human-machine interaction. In this talk, he will discuss about recent research outcomes on fully portable, wireless, soft wearable electronics for advanced physiological monitoring and persistent brain-machine interfaces.

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Expansion of Electrospinnable Materials Beyond High Molecular Weight Polymers

2019-09-24 , Brettmann, Blair

Electrospinning is a valuable production method for nanoscale polymeric fibers. However, a major limitation of the technology is the requirement for the use of high molecular weight polymers as a major part of the matrix. Many applications would benefit from a more expansive range in the materials able to be electrospun, including pharmaceuticals, wearable devices and diagnostics, and active filtration. In order to realize these more advanced functional materials, composites of polymers and particles must be developed and a strong understanding of how particle inclusion affects the electrospinning process and mat properties is essential. In this work, we examine material systems containing various polymers and active particles, focusing on how inclusion of particles affects electrospinnability and functionality of the fibrous mat. We have found that polymer solutions with high conductivity, hence narrow fiber diameters, tend to trap particles in a web-like structure, rather than within individual fibers. Other polymer-particle systems exhibit a ‘bunches of grapes’ morphology where the particles agglomerate yet the polymer matrix still surrounds them and connects the bunches with fibers. These interesting morphologies can be explained by conductivity, rheology, and particle interactions in the polymer solution. We also examine how particle inclusion affects the viscoelasticity of the solutions and tie this to the electrospinning process window; showing that a finite window of viscoelasticity yields optimal electrospinnability. We use these fundamental results to electrospin materials for advanced functional applications such as pharmaceuticals and conducting polymers and provide outlook for further work in increasing the range of materials that are electrospinnable.

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Semiconductor Nanomaterials for Transient Electronics

2019-10-22 , Rogers, John A.

A remarkable feature of modern integrated circuit technology is its ability to operate in a stable fashion, with almost perfect reliability, without physical or chemical change. Recently developed classes of electronic materials create an opportunity to engineer the opposite outcome, in the form of ‘transient’ devices that dissolve, disintegrate or otherwise disappear at triggered times or with controlled rates. Water-soluble transient electronics serve as the foundations for interesting applications in zero-impact environmental monitors, 'green' consumer electronics and bio-resorbable biomedical implants. This presentation describes the foundational concepts in chemistry, materials science and assembly processes for bioresorbable electronics in 1D, 2D and 3D architectures. Wireless sensors of intracranial temperature, pressure and electrophysiology designed for use in treatment of traumatic brain injury and nerve stimulators configured for accelerated neuroregeneration provide application examples.

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Wearable Joint Health Assessment with Acoustic Emission and Bioimpedance Spectroscopy Sensing

2019-10-10 , Inan, Omer T.

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Plate Mechanical Metamaterials and Their Applications

2019-09-10 , Bargatin, Igor

Recently, we introduced the concept of plate mechanical metamaterials—cellular plates with carefully controlled periodic geometry and unique mechanical properties—as well as its initial realization in the form of freestanding corrugated plates made out of an ultrathin film. We used atomic layer deposition (ALD) and microfabrication techniques to make robust plates out of a single continuous ALD layer with cm-scale lateral dimensions and thicknesses between 25 and 100 nm, creating the thinnest freestanding plates that can be picked up by hand. We also fabricated and characterized nanocardboard - plate metamaterials made from multiple layers of nanoscale thickness, whose geometry and properties are reminiscent of honeycomb sandwich plates or corrugated paper cardboard. Ultralow weight, mechanical robustness, thermal insulation, as well as chemical and thermal stability of alumina make plate metamaterials attractive for numerous applications, including structural elements in flying microrobots and interstellar light sails, high-temperature thermal insulation in energy converters, photophoretic levitation, as well as ultrathin sensors and resonators. I will briefly discuss our experimental progress on all these applications, including demonstrations of extremely robust thermal insulators that can sustain a temperature difference of ~1000 K across a micron-scale gap, hollow AFM cantilevers that offer greatly enhanced sensitivity and data acquisition rates, and macroscopic plates that levitate when illuminated by light.

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