Nanofiber-nanowire composite and fabrication method thereof

Patent metadata

Field	Value
Publication number	US-9309405-B2
Application number	US-80188810-A
Country	US
Kind code	B2
Filing date	Jun 30, 2010
Priority date	Jan 15, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Example embodiments are directed to a nanofiber-nanowire composite includes a polymer nanofiber; and a plurality of nanowires of a metal oxide extending from inside to outside of the polymer nanofiber and covering the polymer nanofiber. According to example embodiments, a method of fabricating a nanofiber-nanowire composite includes forming a nanofiber including a metal seed; and growing nanowires of a metal oxide from the metal seed to the outside of the nanofiber.

First claim

What is claimed is:

1. A nanofiber-nanowire composite consisting of:
a polymer nanofiber which is a nanofiber consisting of a polymer, and a plurality of nanowires of a metal oxide extending from the inside of the polymer nanofiber to the outside of the polymer nanofiber and covering the polymer nanofiber.

2. The nanofiber-nanowire composite of claim 1 , wherein the polymer nanofiber comprises a water-insoluble polymer.

3. The nanofiber-nanowire composite of claim 2 , wherein the water-insoluble polymer is prepared by cross-linking a water-soluble polymer.

4. The nanofiber-nanowire composite of claim 2 , wherein the water-insoluble polymer is a photosensitive polymer including an epoxy resin.

5. The nanofiber-nanowire composite of claim 3 , wherein the water-soluble polymer comprises at least one selected from a group consisting of polyvinyl alcohol (PVA), polyacrylic acid (PAA), polystyrene sulfonic acid, polyhydroxyethyl methacrylate, polyethylene oxide (PEO), polyvinyl pyrrolidone (PVP), polyacrylamide (PA), PVA-PEO-PVA, PVA-poly propylene oxide (PPO)-PVA, PVA-PA, PVA-PA-PAA, PVA-polystyrene (PS) -PVA, and PVA-PVA, PVA-SbQ prepared by introducing a stilbazolium group to PVA, and polyethylene glycol diacrylate.

6. The nanofiber-nanowire composite of claim 1 , wherein the metal oxide comprises zinc oxide (ZnO), tin-dioxide (SnO 2 ), titanium dioxide (TiO 2 ), or indium oxide (In 2 O 3 ).

7. A method of fabricating a nanofiber-nanowire composite consisting of a polymer nanofiber, the method comprising:
forming the polymer nanofiber which is a nanofiber consisting of a polymer, and a plurality of nanowires of a metal oxide,
the plurality of nanowires being grown from a metal seed to the outside of the polymer nanofiber such that the plurality of nanowires extend from the inside of the polymer nanofiber to the outside of the polymer nanofiber and cover the polymer nanofiber.

8. The method of claim 7 , wherein forming the polymer nanofiber comprises:
forming a polymer film by spin coating a composition including a photosensitive polymer, a precursor of the metal oxide, and a solvent; and
patterning the polymer nanofiber by exposing the polymer film to light using a photomask and developing the polymer film.

9. The method of claim 7 , wherein forming the polymer nanofiber comprises:
forming a pre-nanofiber by electrospinning a composition including a water-soluble polymer, a first precursor of the metal oxide, and a solvent; and
converting the water-soluble polymer in the pre-nanofiber into a water-insoluble polymer by cross-linking the water-soluble polymer.

10. The method of claim 9 , wherein the water-soluble polymer is cross-linked by heat-treatment.

11. The method of claim 9 , wherein the water-soluble polymer is cross-linked by UV-radiation.

12. The method of claim 7 , wherein growing the nanowires of the metal oxide includes immersing the polymer nanofiber in a hexamethyltetradiamine (HMTA, (CH 2 ) 6 N 4 ) solution.

13. The method of claim 12 , wherein growing the nanowires of the metal oxide further includes adding a second precursor of the metal oxide to the HMTA solution in which the polymer nanofiber is immersed.

14. The method of claim 12 , wherein growing the nanowires of the metal oxide comprises:
heating the polymer nanofiber in a mixed solution including zinc acetate, deionized water, and methanol; and
adding a solution including potassium hydroxide and methanol into the mixed solution.

15. The method of claim 8 , wherein the composition further includes a conductive material.

16. The method of claim 7 , wherein the metal oxide includes zinc oxide (ZnO), tin-dioxide (SnO 2 ), titanium dioxide (TiO 2 ), or indium oxide (In 2 O 3 ).

17. The nanofiber-nanowire composite of claim 1 , wherein the polymer nanofiber has a hydrophobic surface.

Assignees

• Park Jong-Jin
• Cha Seung-Nam
• Hur Jae-Hyun
• Samsung Electronics Co Ltd

Inventors

• Park Jong-Jin
• Cha Seung-Nam
• Hur Jae-Hyun

Classifications

• B29C48/022

  characterised by the choice of material · CPC title

• Y10T428/2913

  Rod, strand, filament or fiber · CPC title

• G03F7/038

  Macromolecular compounds which are rendered insoluble or differentially wettable (G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021) · CPC title

• D01F6/10

  from polyvinyl chloride or polyvinylidene chloride · CPC title

• B29C48/05

  Filamentary, e.g. strands · CPC title