Open Access Nano Express

Facile fabrication of high-efficiency near-infrared absorption film with tungsten bronze nanoparticle dense layer

Seong Yun Lee12, Jae Young Kim1, Jun Young Lee2, Ho Jun Song1, Sangkug Lee1, Kyung Ho Choi1 and Gyojic Shin1*

Author Affiliations

1 IT Convergence Material R&D Group, Korea Institute of Industrial Technology, Cheonan 331-825, Republic of Korea

2 Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea

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Nanoscale Research Letters 2014, 9:294  doi:10.1186/1556-276X-9-294

Published: 11 June 2014

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.

PACS

78.67.Sc; 78.67.Bf; 81.15.-z

Keywords:
Nanodistance; Nanoparticles; Double layer; Near-infrared absorption; Surface plasmon resonance; Tungsten bronzes