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公开(公告)号：US20180354806A1
公开(公告)日：2018-12-13
申请号：US15775735
申请日：2016-11-11
Inventor： Alexander Green , Ahmed Yousaf , Abhishek Debnath
Abstract: Some embodiments include a method of producing metal diboride nanomaterials having thickness down to the atomic scale and lateral areas from 10 nm to over 1 μm by preparing a mixture of a metal diboride and a suspending solution. The suspending solution can be an organic solvent or a solution containing water, and optionally can include a dispersion agent, such as a surfactant, a polymer, small molecule, or biopolymer. Further, the method includes exfoliating the metal diboride by exposing the mixture to ultrasonic energy, centrifuging the mixture forming supernatant that includes a dispersion of exfoliated metal diborides, and extracting the dispersion from the supernatant. Some embodiments include extracting the supernatant and casting the solution by diluting the dispersion with a second suspending solution that includes dissolved polymer. This can result in a composite film includes a dispersion of the exfoliated metal diborides and provides improved mechanical properties.
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公开(公告)号：US10711210B2
公开(公告)日：2020-07-14
申请号：US15775735
申请日：2016-11-11
Inventor： Alexander Green , Ahmed Yousaf , Abhishek Debnath
IPC: C10L3/10 , C08K3/38 , C08J3/21 , C08L29/04 , C01B35/04 , C08J3/215 , C08J5/18 , B01D53/047 , B01D53/26 , B82Y30/00 , B82Y40/00
Abstract: Some embodiments include a method of producing metal diboride nanomaterials having thickness down to the atomic scale and lateral areas from 10 nm to over 1 μm by preparing a mixture of a metal diboride and a suspending solution. The suspending solution can be an organic solvent or a solution containing water, and optionally can include a dispersion agent, such as a surfactant, a polymer, small molecule, or biopolymer. Further, the method includes exfoliating the metal diboride by exposing the mixture to ultrasonic energy, centrifuging the mixture forming supernatant that includes a dispersion of exfoliated metal diborides, and extracting the dispersion from the supernatant. Some embodiments include extracting the supernatant and casting the solution by diluting the dispersion with a second suspending solution that includes dissolved polymer. This can result in a composite film includes a dispersion of the exfoliated metal diborides and provides improved mechanical properties.
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公开(公告)号：US10155782B2
公开(公告)日：2018-12-18
申请号：US15288952
申请日：2016-10-07
Inventor： Qing Hua Wang , Ximo Chu , Alexander Green , Ahmed Yousaf
Abstract: Embodiments of the invention provide a lithium-free metal dichalcogenides functionalization method where a metal dichalcogenide including a surface of predominantly semiconducting 2H phase is reacted with an aryl diazonium salt by exposing at least a portion of transition metal dichalcogenide to the aryl diazonium salt in the absence of alkyl lithium or alkyl lithium. A substantial portion of the reaction of the at least one aryl diazonium salt with the at least one transition metal dichalcogenide occurs with the semiconducting 2H phase. The aryl diazonium salt can be 4-nitrobenzenediazonium tetrafluoroborate or 4-carboxybenzene diazonium tetrafluoroborate, and the metal dichalcogenide can be MoS2. The semiconducting 2H phase of the transition metal dichalcogenide is derived directly from mechanical exfoliation such as mechanical cleaving and/or sonication.
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