title: Facile fabrication of high-efficiency near-infrared absorption film with tungsten bronze nanoparticle dense layer.
abstract: An excellent transparent film with effective absorption property in near-infrared (NIR) region based on cesium-doped tungsten oxide nanoparticles was fabricated using a facile double layer coating method via the theoretical considerations. The optical performance was evaluated; the double layer-coated film exhibited 10% transmittance at 1,000 nm in the NIR region and over 80% transmittance at 550 nm in the visible region. To optimize the selectivity, the optical spectrum of this film was correlated with a theoretical model by combining the contributions of the Mie-Gans absorption-based localized surface plasmon resonance and reflections by the interfaces of the heterogeneous layers and the nanoparticles in the film. Through comparison of the composite and double layer coating method, the difference of the nanoscale distances between nanoparticles in each layer was significantly revealed. It is worth noting that the nanodistance between the nanoparticles decreased in the double layer film, which enhanced the optical properties of the film, yielding a haze value of 1% or less without any additional process. These results are very attractive for the nanocomposite coating process, which would lead to industrial fields of NIR shielding and thermo-medical applications.
  78.67.Sc; 78.67.Bf; 81.15.-z.
authors: IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea ; Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors: Seong Yun
authors: SY
authors: Lee
authors: IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea.
authors: Jae Young
authors: JY
authors: Kim
authors: Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors: Jun Young
authors: JY
authors: Lee
authors: IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea.
authors: Ho Jun
authors: HJ
authors: Song
authors: IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea.
authors: Sangkug
authors: S
authors: Lee
authors: IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea.
authors: Kyung Ho
authors: KH
authors: Choi
authors: IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea.
authors: Gyojic
authors: G
authors: Shin
keywords: Double layer; Nanodistance; Nanoparticles; Near-infrared absorption; Surface plasmon resonance; Tungsten bronzes