公开(公告)号：US20240402400A1

公开(公告)日：2024-12-05

申请号：US18733569

申请日：2024-06-04

Applicant: Regents of the University of Minnesota ,  University of Notre Dame du Lac

Inventor： Seungjun Lee ,  Dongjea Seo ,  Sang Hyun Park ,  Tony Low ,  Steven J. Koester ,  Rehan Younas ,  Christopher Hinkle

IPC: G02B5/00

Abstract: Approaches to stack monolayer transition metal dichalcogenides (TMD) materials to develop near-perfect light absorbers (NPLAs) with only two atomic layers of TMD. Stacking TMDs may result in interlayer coupling with undesirable light absorbing behavior. The NPLAs of this disclosure stacks monolayer TMDs in such a way as to minimize TMD interlayer coupling, thus preserving TMD strong band nesting properties. Examples of approaches in this disclosure control the interlayer coupling by, for example, (a) twisted TMD bi-layers and (b) adding a buffer layer, e.g., a TMD/buffer layer/TMD tri-layer heterostructure. The NPLAs of this disclosure use the band nesting effect in TMDs, combined with a Salisbury screen geometry, to demonstrate NPLAs using only two or three uniform atomic layers of TMDs.

公开(公告)号：US11820061B2

公开(公告)日：2023-11-21

申请号：US16951794

申请日：2020-11-18

Applicant: Regents of the University of Minnesota ,  U.S. Government as Represented by the Secretary of the Army

Inventor： Michael C. McAlpine ,  Ruitao Su ,  Steven J. Koester ,  Joshua Uzarski

IPC: B29C48/05 ,  B01F33/30 ,  B01L3/00 ,  B33Y30/00 ,  B33Y80/00 ,  B29C48/30 ,  B29C35/08 ,  C08L83/04 ,  B33Y70/00

CPC classification number: B29C48/05 ,  B29C35/0805 ,  B29C48/30 ,  B33Y30/00 ,  B33Y80/00 ,  C08L83/04 ,  B01F33/30 ,  B01L3/502715 ,  B01L3/502738 ,  B01L2200/0689 ,  B01L2300/0627 ,  B01L2300/123 ,  B01L2400/06 ,  B29C2035/0827 ,  B29C2791/002 ,  B29C2948/92571 ,  B33Y70/00

Abstract: A printed structure including a plurality of overlying layers of elongate polymeric filaments stacked on a surface of a substrate. The elongate polymeric filaments are stacked on each other along their lengths to form a liquid impermeable, self-supporting wall. The liquid impermeable self-supporting wall forms a wall angle of about 30° to about 90° with respect to a plane of the surface of the substrate.

公开(公告)号：US20200319129A1

公开(公告)日：2020-10-08

申请号：US16905364

申请日：2020-06-18

Applicant: Regents of the University of Minnesota

Inventor： Steven J. Koester

IPC: G01N27/22 ,  H01L29/10 ,  H01L29/16 ,  H01L29/423 ,  H01L29/93 ,  H01L31/08 ,  H01L31/115 ,  G01R27/26

Abstract: An electrical device includes at least one graphene quantum capacitance varactor. In some examples, the graphene quantum capacitance varactor includes an insulator layer, a graphene layer disposed on the insulator layer, a dielectric layer disposed on the graphene layer, a gate electrode formed on the dielectric layer, and at least one contact electrode disposed on the graphene layer and making electrical contact with the graphene layer. In other examples, the graphene quantum capacitance varactor includes an insulator layer, a gate electrode recessed in the insulator layer, a dielectric layer formed on the gate electrode, a graphene layer formed on the dielectric layer, wherein the graphene layer comprises an exposed surface opposite the dielectric layer, and at least one contact electrode formed on the graphene layer and making electrical contact with the graphene layer.

公开(公告)号：US10712302B2

公开(公告)日：2020-07-14

申请号：US16222660

申请日：2018-12-17

Applicant: Regents of the University of Minnesota

Inventor： Steven J. Koester

IPC: H01L29/93 ,  G01N27/22 ,  H01L29/10 ,  H01L29/16 ,  H01L29/423 ,  H01L31/08 ,  H01L31/115 ,  G01R27/26

Abstract: An electrical device includes at least one graphene quantum capacitance varactor. In some examples, the graphene quantum capacitance varactor includes an insulator layer, a graphene layer disposed on the insulator layer, a dielectric layer disposed on the graphene layer, a gate electrode formed on the dielectric layer, and at least one contact electrode disposed on the graphene layer and making electrical contact with the graphene layer. In other examples, the graphene quantum capacitance varactor includes an insulator layer, a gate electrode recessed in the insulator layer, a dielectric layer formed on the gate electrode, a graphene layer formed on the dielectric layer, wherein the graphene layer comprises an exposed surface opposite the dielectric layer, and at least one contact electrode formed on the graphene layer and making electrical contact with the graphene layer.

公开(公告)号：US20190331661A1

公开(公告)日：2019-10-31

申请号：US16393177

申请日：2019-04-24

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA ,  Boston Scientific Scimed, Inc.

Inventor： Xue Zhen ,  Philippe Pierre Joseph Buhlmann ,  Steven J. Koester ,  Justin Theodore Nelson

IPC: G01N33/497 ,  G01N27/22 ,  G01N27/12

Abstract: Embodiments include chemical sensors, devices and systems including the same, and related methods. In an embodiment, a medical device is provided. The medical device can include a graphene varactor, including a graphene layer and a self-assembled monolayer disposed on an outer surface of the graphene layer through electrostatic interactions between a partial positive charge on hydrogen atoms of one or more hydrocarbons of the self-assembled monolayer and a it-electron system of graphene. The self-assembled monolayer can include one or more substituted porphyrins or substituted metalloporphyrins, or derivatives thereof. Other embodiments are also included herein.

公开(公告)号：US11908901B1

公开(公告)日：2024-02-20

申请号：US16818494

申请日：2020-03-13

Applicant: Regents of the University of Minnesota

Inventor： Steven J. Koester ,  Venkata Raghava Saran Kumar Chaganti

IPC: H01L29/16 ,  H01L29/40 ,  H01L21/28 ,  H01L29/93

CPC classification number: H01L29/1606 ,  H01L29/408 ,  H01L29/40111 ,  H01L29/93

Abstract: A varactor may include a gate electrode; a graphene layer; and a ferroelectric layer between the gate electrode and the graphene layer.

公开(公告)号：US11662325B2

公开(公告)日：2023-05-30

申请号：US16712255

申请日：2019-12-12

Applicant: Boston Scientific Scimed, Inc. ,  REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Gregory J. Sherwood ,  Justin Theodore Nelson ,  Steven J. Koester

IPC: G01N27/02 ,  G01N27/22 ,  G01N33/00

CPC classification number: G01N27/021 ,  G01N27/221 ,  G01N27/227 ,  G01N33/0036

Abstract: Embodiments herein include a kinetic response system for measuring analyte presence on a chemical sensor element. The chemical sensor element includes one or more discrete binding detectors, each discrete binding detector including a graphene varactor. The kinetic response system includes a measurement circuit having an excitation voltage generator for generating a series of excitation cycles over a time period. Each excitation cycle includes delivering a DC bias voltage to the discrete binding detectors at multiple discrete DC bias voltages across a range of DC bias voltages. The kinetic response system includes a capacitance sensor to measure capacitance of the discrete binding detectors resulting from the excitation cycles. The kinetic response system includes a controller circuit to determine the kinetics of change in at least one of a measured capacitance value and a calculated value based on the measured capacitance over the time period. Other embodiments are also included herein.

公开(公告)号：US20210369250A1

公开(公告)日：2021-12-02

申请号：US17328478

申请日：2021-05-24

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA ,  Boston Scientific Scimed, Inc.

Inventor： Philippe Pierre Joseph Buhlmann ,  Steven J. Koester ,  Justin Theodore Nelson ,  Xue Zhen

IPC: A61B10/00 ,  C01B32/194 ,  C01G7/00

Abstract: Embodiments herein relate to chemical sensors, devices and systems including the same, and related methods. In an embodiment, a medical device is included having a graphene varactor. The graphene varactor includes a graphene layer and at least one non-covalent modification layer disposed on an outer surface of the graphene layer. The non-covalent modification layer can include nanoparticles selected from a group that can include one or more metals, metal oxides, or derivatives thereof. Other embodiments are also included herein.

公开(公告)号：US20210147238A1

公开(公告)日：2021-05-20

申请号：US17096104

申请日：2020-11-12

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA ,  Boston Scientific Scimed, Inc.

Inventor： Steven J. Koester ,  Xue Zhen ,  Philippe Pierre Joseph Buhlmann ,  Qun Su ,  Justin Theodore Nelson ,  Gregory J. Sherwood

IPC: C01B32/19 ,  C09D5/00 ,  C09D9/00 ,  C09D127/12 ,  G01N33/00 ,  G01N27/22

Abstract: Embodiments herein relate to methods and systems for applying a transfer material layer to graphene during a graphene fabrication process. In an embodiment, a method of producing a graphene sensor element is included. The method includes forming a graphene layer on a growth substrate and applying a fluoropolymer coating layer over the graphene layer. The method includes removing the growth substrate and transferring the graphene and fluoropolymer coating layers onto a transfer substrate, where the graphene layer is disposed on the transfer substrate and the fluoropolymer layer is disposed on the graphene layer. The method also includes removing the fluoropolymer coating layer. Other embodiments are also included herein.

公开(公告)号：US20190257825A1

公开(公告)日：2019-08-22

申请号：US16280635

申请日：2019-02-20

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA ,  Boston Scientific Scimed, Inc.

Inventor： Xue V. Zhen ,  Philippe Pierre Joseph Buhlmann ,  Steven J. Koester ,  Yao Zhang ,  Justin Theodore Nelson

IPC: G01N33/53

Abstract: Embodiments herein relate to chemical sensors, devices and systems including the same, and related methods. In an embodiment, a medical device is included. The medical device can include a graphene varactor. The graphene varactor can include a graphene layer and a self-assembled monolayer disposed on an outer surface of the graphene layer through π-π stacking interactions. The self-assembled monolayer can provide a Langmuir theta value of at least 0.9. The self-assembled monolayer can include polycyclic aromatic hydrocarbons, tetraphenylporphyrins or derivatives thereof, metallotetraphenylporphyrins, or aromatic cyclodextrins. Other embodiments are also included herein.