Substrate-free crystalline 2D bismuthene

Patent metadata

Field	Value
Publication number	US-11623873-B2
Application number	US-201916685114-A
Country	US
Kind code	B2
Filing date	Nov 15, 2019
Priority date	Dec 6, 2018
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

The present disclosure generally relates to compositions comprising substrate-free crystalline 2D bismuthene, and the method of making and using the substrate-free crystalline 2D bismuthene.

First claim

The invention claimed is:

1. A composition comprising substrate-free crystalline 2D bismuthene nanoflakes having a substantially equilateral triangle shape.

2. The composition of claim 1 , wherein the crystalline 2D bismuthene nanoflakes have single crystalline nature.

3. The composition of claim 1 , wherein the length of each side of the substantially equilateral triangle shape is 0.1-100 μm.

4. The composition of claim 1 , wherein the crystalline 2D bismuthene nanoflakes have multilayer structure with a thickness of 0.1-30 nm.

5. The composition of claim 1 , wherein the crystalline 2D bismuthene nanoflakes are characterized by an X-ray diffraction pattern (CuKα radiation, λ=1.54056 A) comprising a peak at 26.16 (2θ±0.1°), and optionally one or more peaks selected from the group consisting of 36.99, 38.64, 47.67, and 55.14 (2θ±0.1°).

6. A method of preparing the substrate-free crystalline 2D bismuthine nanoflakes according to claim 1 , wherein the method comprises reductive reaction of NaBiO 3 with a capping polymer and a polyol.

7. The method of claim 6 , wherein the method comprises steps:
dissolving the capping polymer in the polyol to form a mixture of the capping polymer and the polyol;
heating the mixture to an elevated temperature for a period of time and then cooling the mixture to ambient temperature;
adding NaBiO 3 to the mixture of the capping polymer and the polyol, and heating the newly formed mixture to an elevated temperature for a period of time; and
cooling the reaction mixture to ambient temperature to provide the substrate-free crystalline 2D bismuthene nanoflakes.

8. The method of claim 6 , wherein the polyol is ethylene glycol, the capping polymer is polyvinylpyrrolidone (PVP).

Assignees

• Purdue Research Foundation

Inventors

• Wu Wenzhuo
• Wang Yixiu

Classifications

• C30B29/10

  Inorganic compounds or compositions · CPC title

• C01P2002/20

  Two-dimensional structures · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title

• C01P2004/24

  Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer · CPC title

• C30B29/60

  characterised by shape · CPC title