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Room-Temperature Synthesis of Inorganic–Organic Hybrid Coated VO₂ Nanoparticles for Enhanced Durability and Flexible Temperature-Responsive Near-Infrared Modulator Application

Zhao, Shuwen, Tao, Ying, Chen, Yunxiang, Zhou, Yijie, Li, Rong, Xie, Lingling, Huang, Aibin, Jin, Ping, Ji, Shidong
ACS applied materials & interfaces 2019 v.11 no.10 pp. 10254-10261
ambient temperature, durability, fluorescence, image analysis, nanoparticles, relative humidity, transmittance, vanadium
Vanadium dioxide is one kind of desirable infrared modulator for sensors because of its remarkable temperature-responsive infrared modulation ability via autogeneic metal–insulator transition. However, the detriments of poor chemical stability and narrow scope of extensive-researched application (e.g., smart windows) restrict its mass production. Here, we propose a VO₂@MgF₂@PDA inorganic–organic hybrid coated architecture for greatly enhancing the optical durability more than 13 times in contrast to pristine VO₂ and the transmittance difference between room and high temperature changed within 20% (decreasing from 25 to 20.1%) at λ = 1200 nm after the ageing time of 1000 h at constant temperature (60 °C) and relative humidity (90%). Furthermore, based on the as-synthesized durability-enhanced nanoparticles, we fabricated a flexible sensor for temperature-field fluorescence imaging by integrating the VO₂-based near-infrared modulator with the upconversion fluorescence material. Additionally, the formation mechanism of VO₂@MgF₂ core–shell nanoparticles was studied in detail. The inorganic–organic combination strategy paves a new way for improving the stability of nanoparticles, and the use of VO₂-based flexible temperature-fluorescence sensors is a promising technique for remote and swift temperature-field distribution imaging on complicated and campulitropal surfaces.