Creating and protecting magnetic nanomaterials

Patent metadata

Field	Value
Publication number	US-11851757-B2
Application number	US-202016776702-A
Country	US
Kind code	B2
Filing date	Jan 30, 2020
Priority date	Jan 30, 2020
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

Coated nanofibers and methods for forming the same. A magnetic nanofiber is formed and a barrier coating is deposited on the magnetic nanofiber by atomic layer deposition (“ALD”) process. The coated nanofiber may include a reduced magnetic nanostructure and a barrier coating comprising a first oxide coating on the nanofiber, the coating being non-reactive with the magnetic polymer nanofiber, the barrier coating have a thickness of 2 nm to 12 nm.

First claim

What is claimed is:

1. A method of forming a coated nanofiber, comprising:
forming a magnetic nanofiber by:
forming a solution with metal salts and a polymer, and
electrospinning the solution to form a magnetic nanofiber;

reducing the magnetic nanofiber prior to depositing the first material on the magnetic nanofiber;
placing the magnetic nanofiber in a reactor; and
after reducing, depositing a barrier coating on the magnetic nanofiber by atomic layer deposition (“ALD”) process including at least one cycle of:
pulsing a first metal precursor for a first metal precursor pulse time,
exposing a base material of the magnetic nanofiber to the first metal precursor for a first metal precursor exposure time and at a first partial pressure, the first metal precursor binding with the base material,
purging the reactor of the first metal precursor,
pulsing a co-reactant precursor into the reactor for a first co-reactant pulse time;
exposing the base material to the co-reactant precursor for a co-reactant precursor exposure time and at a second partial pressure, and
purging the reactor of the co-reactant precursor.

2. The method of claim 1 , wherein the reduction is performed within the reactor vessel.

3. The method of claim 1 , wherein the barrier coating is a magnetic coating.

4. The method of claim 1 , wherein the barrier coating is a non-magnetic coating.

5. A method of forming a coated nanofiber, comprising:
forming a magnetic nanofiber by:
forming a solution with metal salts and a polymer, and
electrospinning the solution to form a magnetic nanofiber; and

reducing the magnetic nanofiber prior to depositing the first material on the magnetic nanofiber;
depositing a barrier coating on the magnetic nanofiber by atomic layer deposition (“ALD”) process including at least one cycle of:
pulsing a first metal precursor into the reactor for a first metal precursor pulse time,
exposing the magnetic nanofiber to the first metal precursor for a first metal precursor exposure time and at a first partial pressure, binding with the magnetic nanofiber,
purging the reactor of the first metal precursor,
pulsing a co-reactant precursor into the reactor for a first co-reactant pulse time,
exposing the magnetic nanofiber to the co-reactant precursor for a co-reactant precursor exposure time and at a second partial pressure, and
purging the reactor of the co-reactant precursor.

6. The method of claim 5 , wherein the barrier coating is a magnetic coating.

7. The method of claim 5 , wherein the barrier coating is a magnetic coating.

Assignees

• Uchicago Argonne Llc

Inventors

• Mane Anil U
• Zhang Yuepeng
• Choudhury Devika
• Elam Jeffrey W
• Gao Kaizhong
• Hryn John N

Classifications

• C23C16/45555 Primary

  applied in non-semiconductor technology · CPC title

• B22F1/0547

  Nanofibres or nanotubes · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• C23C16/08

  from metal halides · CPC title

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title