Inorganic nanofiber and method for manufacturing the same

• US 10,391,476 B2
• Filed: 01/16/2017
• Issued: 08/27/2019
• Est. Priority Date: 06/01/2016
• Status: Active Grant

• Current Assignee: Tamkang University
• Original Assignee: Tamkang University
• Inventors: Yeh, Ping-Hung, Lai, Chun-Yen, Lin, Yu-Ting, Pan, Pin-Chun
• Primary Examiner(s): Fiorito, James A
• Application Number:
  US15/406,962
• Publication Number:
  US 20170348673A1
• Time in Patent Office: 953 Days
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 23/14 of germanium, tin or lead
• CPC Class Codes: B01J 35/23 in a colloidal state
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 35/40 characterised by dimensions, e.g. grain size in a colloidal state B01J35/23; crystallite size B01J35/77
• CPC Class Codes: B01J 35/58 Fabrics or filaments
• CPC Class Codes: B01J 37/04 Mixing B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B01J 37/086 Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid
• CPC Class Codes: B01J 37/088 Decomposition of a metal salt
• CPC Class Codes: B01J 37/342 of electric, magnetic or electromagnetic fields, e.g. for magnetic separation

Abstract

An organic nanofiber includes a fiber body containing multiple inorganic oxide particles selected from polycrystalline titanium dioxide particles and polycrystalline tin(IV) oxide particles, and having a particle size ranging from 15 to 75 nm. A method for manufacturing the inorganic nanofibers, including: mixing a metal precursor, an organic polymer and a solvent to obtain a solution, the metal precursor being a titanium-containing precursor or a tin-containing precursor; electrospinning the solution at a relative humidity ranging from 50 to 60% to form multiple nanofibers; and annealing the nanofibers at a temperature ranging from 600 to 800° C. to obtain multiple inorganic nanofibers.

Claims

1. A method for manufacturing inorganic nanofibers capable of generating an electric current upon exposure to visible or infrared light, comprising:

adding polyvinylpyrrolidone into ethanol to obtain a polymer solution containing 9% of polyvinylpyrrolidone;

mixing the polymer solution with acetic acid in a volume ratio of 7;

2 and then adding titanium isopropoxide to obtain an electrospinnable solution containing titantium and having a molar concentration of 0.23M;

electrospinning the electrospinnable solution at a relative humidity ranging from 50% to 60% to form a plurality of nanofibers; and

annealing the nanofibers at a temperature ranging from 700°

C. to 800°

C. to obtain a plurality of polycrystalline titanium dioxide nanofibers, wherein the polycrystalline titanium dioxide nanofibers are capable of generating an electric current upon exposure to ultraviolet, visible or infrared light.

2. The method as claimed in claim 1, wherein the step of electrospinning is conducted at a voltage ranging from 18 kV to 20 kV.

3. The method as claimed in claim 1, wherein during the step of electro spinning, a tip-to-collector distance ranges from 13 cm to 15 cm.

4. The method as claimed in claim 1, wherein, prior to electro spinning, the electrospinnable solution is heated to a temperature ranging from 70°

C. to 80°

C. for 1 hour to 3 hours, followed by cooling the electrospinnable solution to room temperature for electro spinning.

5. The method as claimed in claim 1, wherein the polycrystalline titanium dioxide nanofibers include titanium dioxide particles having a particle size ranging from 15 nm to 75 nm.

6. The method as claimed in claim 1, wherein each of the polycrystalline titanium dioxide nanofibers has a cross-sectional width ranging from 100 nm to 400 nm.