Solution-based fabrication of VO2 (M) nanoparticles via lyophilisation. Issue 33 (11th March 2015)

• Record Type: Journal Article
• Authors: Cao, Xun; Thet, Myat Noe; Zhang, Yu; Joachim Loo, Say Chye; Magdassi, Shlomo; Yan, Qingyu; Long, Yi
• Is Part Of: RSC advances. Volume 5:Issue 33(2015)
• Page Start: 25669
• Page End: 25675
• Publication Date: 2015-03-11
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c4ra16840b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Freeze drying was employed to produce highly pure and crystalline thermochromic VO2 nanoparticles. By changing the precursor concentration and annealing temperature, particle size and crystallinity can be controlled. Abstract : Thermochromic vanadium dioxide (VO2 ) is the most extensively researched smart material owing to its near room-temperature phase transition at around 68 °C. Freeze drying has been employed in the solution-based fabrication of highly pure and crystalline VO2 nanoparticles and it was found that freeze drying can largely eliminate the agglomeration issue which is common in nanoparticle fabrication. The particle size, phase transition temperature ( τ c ), crystallinity and latent heat ( L H ) have been systematically studied by changing the precursor concentration and annealing temperature. The freeze-dried sample (with 7.5 mL H2 O2 in precursor) annealed at 650 °C has a particle size of ∼53 nm and τ c of 64.5 °C, as well as high crystallinity with L C of 36.76 J g −1 .