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Publication Number
US-11993837-B2
Publication Date
2024-05-28
Expiration Date
Abstract
The application discloses a particle for chemiresistor sensor. The particle may include: a nanoparticle core made from a conductive material selected from a group consisting of: Ir, Ir-alloy, IrOx, Ru, Ru-alloy, RuOx and any combination thereof and/or any conducting metallic oxide, having a cross section size of at most 100 nm; and a plurality of organic ligands bonded from one side to the nanoparticle core and capable of interacting with a volatile organic compound.
Core Innovation
The invention relates to a particle for chemiresistor sensor that includes a nanoparticle core made from a conductive material selected from Ir, Ir-alloy, IrOx, Ru, Ru-alloy, RuOx, and any combination thereof. The nanoparticle core has an average diameter of at most 100 nm, and a plurality of organic ligands are bonded from one side to the nanoparticle core and are capable of interacting with a volatile organic compound.
The nanoparticle core may be at least partially covered by an oxide layer, including IrOx and/or RuOx, to enable stronger ligand bonding. The document describes that the oxide layer can promote bonding such as a Ru-O-Si bond, and it contrasts improved air stability versus prior thiol-coated metal nanoparticles.
A chemiresistor sensor architecture is also described that includes two electrodes and a sensing element electrically connected to the two electrodes. The sensing element includes a structure made from the described particles, and the document reports longer sensor lifetimes across regeneration cycles.
Claims Coverage
The independent claim set includes a particle for chemiresistor sensor and an associated chemiresistor sensor structure, with coverage centered on conductive nanoparticle cores (Ir/Ir-alloy/IrOx/Ru/Ru-alloy/RuOx) of average diameter at most 100 nm and one-side bonded organic ligands capable of interacting with a volatile organic compound. Across the independent claim family, the inventive features are refined to oxide-covered cores (IrOx/RuOx), enumerated ligand chemistries, and specific core structural forms, and then extended to a chemiresistor sensor with two electrodes and a sensing element made from the particles.
Conduction-based nanoparticle core and one-side bonded ligands for volatile organic compound interaction
A particle for chemiresistor sensor comprising a nanoparticle core made from a conductive material selected from Ir, Ir-alloy, IrOx, Ru, Ru-alloy, RuOx, and any combination thereof having an average diameter of at most 100 nm, and a plurality of organic ligands bonded from one side to the nanoparticle core and capable of interacting with a volatile organic compound.
Oxide-layer covered core enabling stronger ligand bonding
The nanoparticle core is at least partially covered with an oxide layer comprising IrOx and/or RuOx.
Oxide-covered conductive core with crystalline or mixed/coated structures
The nanoparticle core has a crystalline structure; and/or the nanoparticle core has a mixed structure where a first material is coated by a second material.
Enumerated organic ligand types bonded to the core
The organic ligands are selected from a defined set including Amine like Dodecylamine, Diazoniums, Silanes, Carboxylic Acids, and specified chlorinated/alkoxy/hydroxide variations such as Tri-chloro, methoxy, ethoxy, Tri hydroxide, di-chloro, chloro, and any combination thereof.
Chemiresistor sensor with two electrodes and sensing element made from the particles
A chemiresistor sensor has two electrodes and a sensing element electrically connected to the two electrodes, where the sensing element comprises a structure made from the particles according to claim 1.
Overall claim coverage centers on chemiresistor sensor particles with conductive Ir/Ru-based nanoparticle cores of average diameter at most 100 nm, organic ligands bonded from one side that can interact with volatile organic compounds, optional IrOx/RuOx oxide-layer coverage for stronger bonding, refinements to ligand types and core structures, and an extended chemiresistor sensor including two electrodes and a sensing element formed from the claimed particles.
Stated Advantages
Improved air stability versus prior thiol-coated metal nanoparticles.
Longer sensor lifetimes across regeneration cycles.
Documented Applications
Chemiresistor sensing of volatile organic compounds using a chemiresistor sensor including two electrodes and a sensing element made from the described particles.
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