Facile synthesis of mesoporous VO2 nanocrystals by a cotton-template method and their enhanced thermochromic properties
Facile synthesis of mesoporous VO2 nanocrystals by a cotton-template method and their enhanced thermochromic properties
复制标题
棉模板法简便合成介孔VO2纳米晶及其增强的热致变色性能
DOI：
10.1016/j.solmat.2017.11.001
复制
发表时间：
2018-03-01
影响因子：
6.9
通讯作者：
Parkin, I. P.
中科院分区：
文献类型：
--
作者：
Wu, Shaowen;Tian, Shouqin;Parkin, I. P.
作为一种非常有前途的热致变色材料，VO 2（M/R）（单斜晶系/金红石）由于其固有的低太阳调制（Delta T-sol）和低光透射（T-lum）而尚未在智能窗中广泛应用。为了解决这个问题，多孔结构已被引入到VO 2膜。本文以棉花为模板剂，采用水热法合成了孔径为2-10 nm的介孔VO 2粉体。通过控制水热温度可以有效地控制VO 2粉体的孔径和晶粒尺寸。将介孔VO 2粉体与PVP混合，采用旋涂法制备了VO 2基纳米复合薄膜。基于VO 2的薄膜显示出比以前的报道中出现的更好的性能之间的三角洲T-sol和T-lum。特别地，较大的孔径可以导致较高的可见光透射率，并且较大的晶体尺寸将促进太阳能调制的增强。从这个意义上说，在180 ℃的水热温度下获得的VO 2基薄膜表现出出色的热致变色性能，由于较大的晶体尺寸和孔径，Δ T-sol为12.9%，T-lum高达56.0%。因此，这种合成路线显示了一种潜在的方法，应用介孔VO 2粉末的阳光控制涂料。
As a very promising thermochromic material, VO2 (M/R) (Monoclinic/Rutile) has not been widely applied in smart windows due to its intrinsic low solar modulation (Delta T-sol) and low luminous transmission (T-lum). To address this issue, porous structures have been introduced into the VO2 film. Herein, mesoporous VO2 powders with pore size of about 2-10 nm were synthesized using cotton as template by hydrothermal methods. The pore and crystal size of the synthesized VO2 powders can be reliably controlled by the hydrothermal temperature. The mesoporous VO2 powders were mixed with PVP to prepare the VO2-based nanocomposite films by spin coating. The VO2-based films show a better performance between Delta T-sol and T-lum than that appeared in previous reports. Especially, a larger pore size could lead to a higher visible transmittance and a larger crystal size would facilitate the enhancement in the solar modulation. In this sense, the VO2-based film obtained at the hydrothermal temperature of 180 degrees C exhibits an outstanding thermochromic performance with Delta T-sol of 12.9% and T-lum up to 56.0% due to a larger crystal size and pore size. Therefore, this synthetic route shows a potential method for the application of mesoporous VO2 powders for solar control coatings.