Solution-based fabrication of VO2 (M) nanoparticles via freeze drying
Vanadium dioxide (VO2) has been receiving the attention of researchers due to its solar modulation ability through metal to insulator phase transition at 68 ˚C. Nanocomposite coatings fabricated by dispersing nanoparticles in dielectric matrix have been reported to provide improvement in thermochrom...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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2014
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| Online Access: | http://hdl.handle.net/10356/61957 |
| _version_ | 1826129070181580800 |
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| author | Thet Myat, Noe |
| author2 | Long Yi |
| author_facet | Long Yi Thet Myat, Noe |
| author_sort | Thet Myat, Noe |
| collection | NTU |
| description | Vanadium dioxide (VO2) has been receiving the attention of researchers due to its solar modulation ability through metal to insulator phase transition at 68 ˚C. Nanocomposite coatings fabricated by dispersing nanoparticles in dielectric matrix have been reported to provide improvement in thermochromic properties. Freeze drying assisted solution-based method was used to fabricate VO2 (M) nanoparticles. The size of nanoparticles and phase transition temperature can be tuned by varying the precursor concentration. Moreover, crystallinity of the nanoparticles can be improved by increasing the annealing temperature from 550 to 650 ˚C. The best combination of result was obtained from nanoparticles synthesized using 7.5 mL of H2O2 and annealed at 650 ˚C (particle size ≈ 190 nm, τc = 65.5 ˚C and LH = 31.85 J/g). From the results, it can be inferred that future studies with larger amount of solvent and higher annealing temperature may be useful in producing nanoparticles with smaller size. Increasing the milling strength and duration for nanoparticles before annealing may also help in reducing the particles size. |
| first_indexed | 2024-10-01T07:34:42Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/61957 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:34:42Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/619572023-03-04T15:37:49Z Solution-based fabrication of VO2 (M) nanoparticles via freeze drying Thet Myat, Noe Long Yi School of Materials Science and Engineering DRNTU::Engineering::Materials::Ceramic materials Vanadium dioxide (VO2) has been receiving the attention of researchers due to its solar modulation ability through metal to insulator phase transition at 68 ˚C. Nanocomposite coatings fabricated by dispersing nanoparticles in dielectric matrix have been reported to provide improvement in thermochromic properties. Freeze drying assisted solution-based method was used to fabricate VO2 (M) nanoparticles. The size of nanoparticles and phase transition temperature can be tuned by varying the precursor concentration. Moreover, crystallinity of the nanoparticles can be improved by increasing the annealing temperature from 550 to 650 ˚C. The best combination of result was obtained from nanoparticles synthesized using 7.5 mL of H2O2 and annealed at 650 ˚C (particle size ≈ 190 nm, τc = 65.5 ˚C and LH = 31.85 J/g). From the results, it can be inferred that future studies with larger amount of solvent and higher annealing temperature may be useful in producing nanoparticles with smaller size. Increasing the milling strength and duration for nanoparticles before annealing may also help in reducing the particles size. Bachelor of Engineering (Materials Engineering) 2014-12-12T03:45:51Z 2014-12-12T03:45:51Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/61957 en Nanyang Technological University 46 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Ceramic materials Thet Myat, Noe Solution-based fabrication of VO2 (M) nanoparticles via freeze drying |
| title | Solution-based fabrication of VO2 (M) nanoparticles via freeze drying |
| title_full | Solution-based fabrication of VO2 (M) nanoparticles via freeze drying |
| title_fullStr | Solution-based fabrication of VO2 (M) nanoparticles via freeze drying |
| title_full_unstemmed | Solution-based fabrication of VO2 (M) nanoparticles via freeze drying |
| title_short | Solution-based fabrication of VO2 (M) nanoparticles via freeze drying |
| title_sort | solution based fabrication of vo2 m nanoparticles via freeze drying |
| topic | DRNTU::Engineering::Materials::Ceramic materials |
| url | http://hdl.handle.net/10356/61957 |
| work_keys_str_mv | AT thetmyatnoe solutionbasedfabricationofvo2mnanoparticlesviafreezedrying |