Issue 28, 2021, Issue in Progress

Nanostructured Fe2O3/TiO2 composite particles with enhanced NIR reflectance for application to LiDAR detectable cool pigments

Abstract

Nanostructured Fe2O3/TiO2 composite pigments with improved NIR reflectance were prepared by a homogeneous precipitation method using urea and NH4OH. The optical and morphological properties of the resulting pigment were investigated by varying the weight ratio of Fe2O3 to TiO2 and the calcination temperature. The resulting composite pigment has a nanostructure in which Fe2O3 nanoparticles of 20–30 nm size are well coated on the surface of TiO2 (∼100 nm) and the reflectance is greatly improved in the wavelength range of 620–1350 nm. The ratio of Fe2O3 to TiO2 and the calcination temperature were optimized to provide both high NIR reflectance and red color, which were 0.1 and 700 °C. As a result, compared with pure Fe2O3 (Eg = 2.06 eV, a* = 22.6), the optimized Fe2O3/TiO2 composite pigment (Eg = 2.09 eV, a* = 24.8) showed similar color properties and improved NIR reflectance by about 23.8%. In addition, the Fe2O3/TiO2 composite pigment showed about 62.7% larger reflectance at 905 nm than Fe2O3. According to a temperature rise test under IR illumination, the Fe2O3/TiO2 composite pigment was confirmed to have improved heat shielding properties. Therefore, the nanostructured Fe2O3/TiO2 powder could be potentially applied as a LiDAR detectable cool red pigment for autonomous vehicles.

Graphical abstract: Nanostructured Fe2O3/TiO2 composite particles with enhanced NIR reflectance for application to LiDAR detectable cool pigments

Article information

Article type
Paper
Submitted
02 Apr 2021
Accepted
21 Apr 2021
First published
07 May 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 16834-16840

Nanostructured Fe2O3/TiO2 composite particles with enhanced NIR reflectance for application to LiDAR detectable cool pigments

H. J. Lee, K. Y. Jung and Y. Kim, RSC Adv., 2021, 11, 16834 DOI: 10.1039/D1RA02614C

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