Synthesis of Cerium Oxide Nanorods

Patent metadata

Field	Value
Publication number	US-2016107896-A1
Application number	US-201414515493-A
Country	US
Kind code	A1
Filing date	Oct 15, 2014
Priority date	Jan 29, 2013
Publication date	Apr 21, 2016
Grant date	—

Abstract

Cerium oxide nanorods having a variety of aspect ratios can be produced by providing a first mixture that includes a cerium precursor material, and using microwave to heat the first mixture to a first temperature for a period of time to produce first plurality of cerium oxide nanorods having a first range of aspect ratios. A second mixture that includes a cerium precursor material heated using microwave to a second temperature for a period of time to produce second plurality of cerium oxide nanorods having a second range of aspect ratios. The first plurality of cerium oxide nanorods and the second plurality of cerium oxide nanorods are mixed to produce third plurality of cerium oxide nanorods having the third range of aspect ratios that is broader than the first range or the second range.

First claim

What is claimed is:

1 . A method of fabricating cerium oxide nanorods having a variety of aspect ratios, the method comprising:
providing a first mixture that includes a cerium precursor material; using microwave to heat the first mixture to a first temperature for a first period of time and producing first plurality of cerium oxide nanorods having a first range of aspect ratios; providing a second mixture that includes a cerium precursor material; using microwave to heat the second mixture to a second temperature different from the first temperature for a second period of time and producing second plurality of cerium oxide nanorods having a second range of aspect ratios; and mixing the first plurality of cerium oxide nanorods and the second plurality of cerium oxide nanorods to produce third plurality of cerium oxide nanorods having the third range of aspect ratios that is broader than the first range or the second range.

2 . The method of claim 1 in which providing the first mixture comprises mixing a cerium sulfate precursor and sodium hydroxide to produce the first mixture.

3 . The method of claim 2 in which providing the second mixture comprises mixing a cerium sulfate precursor and sodium hydroxide to produce the second mixture.

4 . The method of claim 1 in which producing first plurality of cerium oxide nanorods comprises producing fluorite structured cerium oxide nanorods.

5 . The method of claim 1 in which heating the first mixture to a first temperature comprises heating the first mixture to a temperature in a range from 80° C. to 200° C.

6 . The method of claim 1 in which heating the first mixture to a first temperature and heating the second mixture to a second temperature comprises heating the second mixture a second temperature that is different from the first temperature by at least 10° C.

7 . The method of claim 1 in which heating the first mixture to a first temperature and heating the second mixture to a second temperature comprises heating the second mixture a second temperature that is different from the first temperature by at least 50° C.

8 . The method of claim 1 in which heating the first mixture to a first temperature and heating the second mixture to a second temperature comprises heating the second mixture a second temperature that is different from the first temperature by at least 100° C.

9 . The method of claim 1 in which producing first plurality of cerium oxide nanorods comprising producing first plurality of cerium oxide nanorods having a range of aspect ratios from 5:1 to 60:1.

10 . The method of claim 1 in which producing the first plurality of cerium oxide nanorods and producing the second plurality of cerium oxide nanorods comprise producing first plurality of cerium oxide nanorods having a first average aspect ratio, producing second plurality of cerium oxide nanorods having a second average aspect ratio, and the first average aspect ratio is greater than the second average aspect ratio by at least 50%.

11 . The method of claim 1 in which producing the first plurality of cerium oxide nanorods and producing the second plurality of cerium oxide nanorods comprise producing first plurality of cerium oxide nanorods having a first average aspect ratio, producing second plurality of cerium oxide nanorods having a second average aspect ratio, and the first average aspect ratio is greater than at least twice the second average aspect ratio.

12 . The method of claim 1 in which producing the first plurality of cerium oxide nanorods and producing the second plurality of cerium oxide nanorods comprise producing first plurality of cerium oxide nanorods having a first average aspect ratio, producing second plurality of cerium oxide nanorods having a second average aspect ratio, and the first average aspect ratio is greater than at least three times the second average aspect ratio.

13 . The method of claim 1 , comprising after heating each of the first and second mixtures, cooling the mixture, filtering the mixture, and drying the mixture to produce the plurality of cerium oxide nanorods.

14 . A method of fabricating cerium oxide nanorods having a variety of lengths, the method comprising:
providing a first mixture that includes a cerium precursor material; using microwave to heat the first mixture to a first temperature and producing first plurality of cerium oxide nanorods having a first range of lengths; providing a second mixture that includes a cerium precursor material; using microwave to heat the second mixture to a second temperature different from the first temperature and producing second plurality of cerium oxide nanorods having a second range of lengths; and mixing the first plurality of cerium oxide nanorods and the second plurality of cerium oxide nanorods to produce third plurality of cerium oxide nanorods having the third range of lengths that is broader than the first range or the second range.

15 . The method of claim 14 in which providing the first mixture comprises mixing a cerium sulfate precursor and sodium hydroxide to produce the first mixture.

16 . The method of claim 15 in which providing the second mixture comprises mixing a cerium sulfate precursor and sodium hydroxide to produce the second mixture.

17 . The method of claim 14 in which producing first plurality of cerium oxide nanorods comprises producing fluorite structured cerium oxide nanorods.

18 . The method of claim 14 in which heating the first mixture to a first temperature comprises heating the first mixture to a temperature in a range from 80° C. to 200° C.

19 . The method of claim 14 in which heating the first mixture to a first temperature and heating the second mixture to a second temperature comprises heating the second mixture a second temperature that is different from the first temperature by at least 10° C.

20 . The method of claim 14 in which heating the first mixture to a first temperature and heating the second mixture to a second temperature comprises heating the second mixture a second temperature that is different from the first temperature by at least 50° C.

21 . The method of claim 14 in which heating the first mixture to a first temperature and heating the second mixture to a second temperature comprises heating the second mixture a second temperature that is different from the first temperature by at least 100° C.

22 . The method of claim 14 in which producing first plurality of cerium oxide nanorods comprising producing first plurality of cerium oxide nanorods having a range of lengths from 40 nm to 2100 nm.

23 . The method of claim 14 in which producing the first plurality of cerium oxide nanorods and producing the second plurality of cerium oxide nanorods comprise producing first plurality of cerium oxide nanorods having a first average length, and producing second plurality of cerium oxide nanorods having a second average length, and the first average length is greater than the second average length by at least 50%.

24 . The method of claim 14 in which producing the first plurality of cerium oxide nanorods and producing the second plurality of cerium oxide nanorods comprise producing first plurality of cerium oxide nanorods having a first average length, producing second plurality of cerium oxide nanorods having a second average length, and the first average length is at least twice the second average length.

25 . The me

Assignees

• Nutech Ventures

Inventors

• Cheung Chin Li
• Gernhart Zane Charles

Classifications

• B01J37/346 Primary

  of microwave energy · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/54

  Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title