One-step hydrothermal synthesis of rare earth/W-codoped VO2 nanoparticles: Reduced phase transition temperature and improved thermochromic properties.

Citation:

Wang N, Goh QS, Lee PL, Magdassi S, Long Y. One-step hydrothermal synthesis of rare earth/W-codoped VO2 nanoparticles: Reduced phase transition temperature and improved thermochromic properties. J. Alloys Compd.Journal of Alloys and Compounds. 2017;711 :222 - 228.

Date Published:

2017///

Abstract:

As a reversible thermochromic material, V dioxide (VO2) is a promising candidate for smart window applications. The trade-off between the integrated visible transmission (Tlum) and the solar modulating ability (ΔTsol), as well as the high phase transition temp. (τc∼68°) are regarded as the main obstacle for practical applications of pure VO2 nanomaterials. The combination of both high τc reducing efficiency of W and improving Tlum/ΔTsol properties of RE (rare earth: Eu, Tb), herein lies the purpose of RE/W-codoping to enhance the thermochromic performance. The RE/W-codoped VO2 nanoparticles were synthesized under hydrothermal conditions, and exhibited grain size of <100 nm. The smart window which was fabricated by coating RE/W-codoped VO2 nanoparticles onto glass, exhibits a thermochromic performance with a combination Tlum = 40%, ΔTsol = 6.3%, τc = 40.8° or Tlum = 63%, ΔTsol = 3.6%, τc = 31.9°, indicating the largely reduced absorption compared with the single W doping. Under the RE/W-codoping conditions, the ionic radius of the RE3+ cations controlled the crystallinity of the VO2 particles and the electron/hole carrier counteraction as well as the competition between the strain and the hole carrier played a vital role in modulating the τc of the VO2 products. The findings should be meaningful for studying the codoping mechanisms for VO2 nanomaterials. [on SciFinder(R)]

Notes:

CAPLUS AN 2017:580361(Journal; Online Computer File)