Northwestern University

University of Minnesota

Uchicago Argonne, LLC

University of California

United States of America As Represented by the Secretary of the Air Force

Harvard College

University of Illinois

Iowa State University Research Foundation, Inc.

Mark C Hersam

Ethan B Secor

Yu Teng Liang

Vinod K Sangwan

Alexander A Green

Michael L Geier

Joohoon Kang

Pradyumna L Prabhumirashi

Kanan P Puntambekar

Deep M Jariwala

Jung-Woo T Seo

Tobin Jay Marks

Samuel I Stupp

Michael S Arnold

Joshua D Wood

Weichao Xu

Hyungil Kim

Kimberly A Gray

Kan-Sheng Chen

Woo Jin Hyun

Xiaolong Liu

Baiju K Vijayan

Nikhita Mansukhani

Liam S C Pingree

Alexander Lee Antaris

Linda M Guiney

Jennifer Ann Lewis

Ramille N Shah

Andre E Nel

Adam E Jakus

Richard P Van Duyne

Lorraine F Francis

C Daniel Frisbie

Tian Xia

Brandon L Fisher

Nathan P Guisinger

Jian Zhu

Timothy P Tyler

Anne-Isabelle Henry

Ana Carolina Mazarin De Moraes

Hong-Sub Lee

Ruibin Li

Megan E Beck

Bok Y Ahn

Sooman Lim

Gordana Ostojic

Andrew J Mannix

Brian T Kiraly

Thomas J Meade

Michael M Thackeray

Christopher E Tabor

Matthew Grayson

Alan Varteres Sahakian

Joseph S Friedman

Jonathan Claussen

Jin-Myoung Lim

Surendra P Shah

In Soo Kim

Yang Tang

Zoi S Metaxa

Benjamin J Leever

Chad Husko

Chuanle Zhou

Hsiang-Hua Hung

Alexander B Cook

Lincoln J Lauhon

Maria S Konsta-Gdoutos

Albert L Lipson

Sudeshna Bandyopadhyay

Hunter J Karmel

Michael J Bedzyk

Norma E S Cortes

Edward T Foley

Lei Li

Laila Jaber Ansari

Norman S Luu

Amit R Trivedi

Ahish Shylendra

Qiucheng Li

Eden B Aklile

Kshama Parate

Sonal V Rangnekar

David Lam

Tejas Shastry

Jeff Guest

Xavier Checoury

Theodore Z Gao

One aspect of this invention relates to hexagonal boron nitride (hBN) ionogel inks using exfoliated hBN nanoplatelets as the solid matrix. The hBN nanoplatelets are produced from bulk hBN powders by liquid-phase exfoliation, allowing printable hBN ionogel inks to be formulated following the addition of an imidazolium ionic liquid and ethyl lactate. The resulting inks are reliably printed with variable patterns and controllable thicknesses by aerosol jet printing, resulting in hBN ionogels that possess high room-temperature ionic conductivities and storage moduli of >3 mS cm−1 and >1 MPa, respectively. By integrating the hBN ionogel with printed semiconductors and electrical contacts, fully-printed thin-film transistors with operating voltages below 1 V are demonstrated on polyimide films. These devices exhibit desirable electrical performance and robust mechanical tolerance against repeated bending cycles, thus confirming the suitability of hBN ionogels for printed and flexible electronics.

Printable ionogel inks and forming methods and applications of same

A composite material and a method for fabricating the same. The composite material includes graphene and active material particles. Each surface of the active material particles is conformally coated with said graphene. The method includes forming a mixture containing an active material, graphene, ethyl cellulose (EC) polymer and multiwalled carbon nanotubes, and thermally annealing the mixture at an annealing temperature in an oxidizing environment to decompose the majority of EC, thereby resulting in the composite material having each active material particle coated with a conformal graphene coating.

Composite material with conformal graphene coating, fabricating methods and applications of same

This invention discloses high-modulus, ion-conductive gel electrolytes and methods of making the gel electrolytes and electrochemical devices. The gel electrolytes include an ionic liquid and nanosheets mixed in the ionic liquid. The nanosheets in one example include exfoliated hexagonal boron nitride (hBN) nanosheets. Compared to conventional bulk hBN microparticles, exfoliated hBN nanosheets improve the mechanical properties of the gel electrolytes by about 2 orders of magnitude, while retaining high ionic conductivity at room temperature. Moreover, exfoliated hBN nanosheets are compatible with high-voltage cathodes, and impart exceptional thermal stability that allows high-rate operation of solid-state rechargeable lithium-ion batteries at high temperatures.

Gel electrolytes for electrochemical devices, fabricating methods and applications of same

Preparation of two-dimensional indium selenide, other two-dimensional materials and related compositions via surfactant-free deoxygenated co-solvent systems.

Optoelectronically-active two-dimensional indium selenide and related layered materials via surfactant-free deoxygenated co-solvent processing

A GHeT includes a bottom gate formed on a substrate; a first dielectric layer (DL) formed on the bottom gate; a monolayer film formed of an atomically thin material on the first DL; a bottom contact (BC) formed on part of the monolayer film; a second DL formed on the BC; a top contact (TC) formed on the second DL on top of the BC; a network of CNTs formed on the TC and the monolayer film, to define an overlap region with the monolayer film; a third DL formed on the CNT network, the monolayer film and the TC; and a top gate formed on the third DL and overlapping with the overlap region. Such GHeT design allows gate tunability of Gaussian peak position, height and width that define Gaussian transfer characteristic, thereby enabling simplified circuit architectures for various spiking neuron functions for emerging neuromorphic applications.

Tunable gaussian heterojunction transistors, fabricating methods and applications of same

An electrode for a lithium-ion battery includes a substrate; and a composite deposited on the substrate, wherein the composite comprises layered graphene comprising mono-, bi- and n-layered graphene, wherein n is an integer selected from 3-about 6; and nanoparticles of a material selected from a cathode active material and an anode active material, wherein the surface of each of said nanoparticles is coupled to and conformally coated with said layered graphene, and wherein said layered graphene is not graphene oxide and is not reduced graphene oxide.

Nanostructured lithium-ion battery electrode composite materials via conformal graphene dispersion

One aspect of the invention relates to a method for fabricating a memtransistor comprising growing a polycrystalline monolayer film on a substrate, wherein the polycrystalline monolayer film contains grains defining a plurality of grain boundaries thereof; and forming an electrode array on the grown polycrystalline monolayer film, wherein the electrode array has a plurality of electrodes electrically coupled with the polycrystalline monolayer film such that each pair of electrodes defines a channel in the polycrystalline monolayer film therebetween.

Method for fabricating a memtransistor

Methods and systems of fabrication of high resolution, high-throughput electrochemical sensing circuits on a substrate. High resolution electrochemical sensing circuits are printed by an effective additive technique to the substrate. Optionally, post-print annealing converts electrochemically inactive printed graphene into one that is electrochemically active. The printing can be by aerosol jet printing, but is not necessarily limited thereto. An example is inkjet printing and then the post-print annealing. Ink formulation would be adjusted for effectiveness with inkjet printing. Optionally biorecognition agents can be covalently bonded to the printed graphene for the purpose of electrochemical biosensing. High throughput fabrication of high-resolution graphene circuits (feature sizes in the tens of microns <50 μm) for electrochemical biosensing is possible by chemical functionalization of the graphene surface with a biological agent.

Aerosol jet printed flexible graphene circuits for electrochemical sensing and biosensing

The invention relates to two dimensional (2D) heterostructures and methods of fabricating the same. The 2D hetero structures are integration of borophene with graphene and 2D lateral and vertical hetero structures with sharp and rotationally commensurate interfaces. The rich bonding configurations of boron indicate that borophene can be integrated into a diverse range of 2D heterostructures.

Borophene-based two-dimensional heterostructures, fabricating methods and applications of same

The invention relates to printable ion-conductive and viscosity-tunable inks based on two-dimensional (2D) insulators, forming methods and applications of the inks. The 2D insulating material based printable ink includes at least one solvent; and an exfoliated composition dispersed in the at least one solvent. The exfoliated composition includes a 2D insulating material and a dispersant and stabilizing agent. The printed structures of the 2D insulating material based printable ink possess high ionic conductivity, chemical and thermal stability, and electrically insulating character, which are an ideal set of characteristics for printable battery components such as separators and solid electrolytes.

Two-dimensional insulator based printable ion-conductive and viscosity-tunable inks, fabricating methods and applications of same

A memtransistor includes a top gate electrode and a bottom gate electrode; a polycrystalline monolayer film formed of an atomically thin material disposed between the top gate electrode and the bottom gate electrode; and source and drain electrodes spatial-apart formed on the polycrystalline monolayer film to define a channel in the polycrystalline monolayer film between the source and drain electrodes. The top gate electrode and the bottom gate electrode are capacitively coupled with the channel.

Dual-gated memtransistor crossbar array, fabricating methods and applications of same

Printable inks based on a 2D semiconductor, such as MoS, and its applications in fully inkjet-printed optoelectronic devices are disclosed. Specifically, percolating films of MoSnanosheets with superlative electrical conductivity (10s m) are achieved by tailoring the ink formulation and curing conditions. Based on an ethyl cellulose dispersant, the MoSnanosheet ink also offers exceptional viscosity tunability, colloidal stability, and printability on both rigid and flexible substrates. Two distinct classes of photodetectors are fabricated based on the substrate and post-print curing method. While thermal annealing of printed devices on rigid glass substrates leads to a fast photoresponse of 150 μs, photonically annealed devices on flexible polyimide substrates possess high photoresponsivity exceeding 50 mA/W. The photonically annealed photodetector also significantly reduces the curing time down to the millisecond-scale and maintains functionality over 500 bending cycles, thus providing a direct pathway to roll-to-roll manufacturing of next-generation flexible optoelectronics.

Two-dimensional semiconductor based printable optoelectronic inks, fabricating methods and applications of same

This invention in one aspect relates to a method of synthesizing a self-assembled mixed-dimensional heterostructure including 2D metallic borophene and 1D semiconducting armchair-oriented graphene nanoribbons (aGNRs). The method includes depositing boron on a substrate to grow borophene thereon at a substrate temperature in an ultrahigh vacuum (UHV) chamber; sequentially depositing 4,4″-dibromo-p-terphenyl on the borophene grown substrate at room temperature in the UHV chamber to form a composite structure; and controlling multi-step on-surface coupling reactions of the composite structure to self-assemble a borophene/graphene nanoribbon mixed-dimensional heterostructure. The borophene/aGNR lateral heterointerfaces are structurally and electronically abrupt, thus demonstrating atomically well-defined metal-semiconductor heterojunctions.

Self-assembled borophene/graphene nanoribbon mixed-dimensional heterostructures and method of synthesizing same

In various embodiments functionalized graphene oxide(s) are provided that demonstrate improved antimicrobial activity, where the graphene oxide(s) are functionalized to increase carbon radical (·C) density.

Identification and optimization of carbon radicals on hydrated graphene oxide for ubiquitous antibacterial coatings

In one aspect of the invention, a dye sensitized solar cell has a counter-electrode including carbon-titania nanocomposite thin films made by forming a carbon-based ink; forming a titania (TiO) solution; blade-coating a mechanical mixture of the carbon-based ink and the titania solution onto a substrate; and annealing the blade-coated substrate at a first temperature for a first period of time to obtain the carbon-based titania nanocomposite thin films. In certain embodiments, the carbon-based titania nanocomposite thin films may include solvent-exfoliated graphene titania (SEG-TiO) nanocomposite thin films, or single walled carbon nanotube titania (SWCNT-TiO) nanocomposite thin films.

Carbon-titania nanocomposite thin films and applications of the same

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Wilmette, IL, United States of America

Mark C Hersam