Abstract
An amorphous precursor of Cr2O3 pigment was prepared via solution combustion synthesis. After calcination at 1000 °C for 1.0 h, the precursor was converted into well-crystallized submicron Cr2O3 crystals with uniform particle distribution and low aggregation. Furthermore, Ti, Co, and Fe were doped into the lattice of Cr2O3, and the effects of these dopants on the reflectance spectroscopy modulation as well as chromatic properties were investigated in detail. As a result, a series of Cr2O3 pigment samples sharing similar spectra within the wavelength from 400 to 1600 nm with green plants could be successfully fabricated.
Highlights
In recent years, chromic oxide (Cr2 O3 ) green pigment has been extensively utilized due to its high stability, pronounced tinting strength, good migration resistance, and low cost [1,2,3].Notably, sharing the similar color with green plants, it has been used to manufacture camouflage coatings for a long time [4]
Compared with S1, significantly larger near-infrared light (NIR) reflectance can be achieved in Ti-doped Cr2 O3 samples S2 and S3, which show promising potential to be used as cool pigments
Fe doping reduces the NIR reflectance in the range of 800–1300 nm, it is tolerable considering that the reflectance is still higher than that of most green plants
Summary
Chromic oxide (Cr2 O3 ) green pigment has been extensively utilized due to its high stability, pronounced tinting strength, good migration resistance, and low cost [1,2,3]. Through an analysis of diffuse reflectance spectra, it can be confirmed that the spectral reflectance characteristics of chromic oxide green pigment is apparently different from that of natural plants. Their intrinsic green colors are ascribed to the characteristic reflection peaks at 550 nm on the reflectance spectrum. Due to the characteristic absorption of chlorophyll, two valleys (around 450 nm and 680 nm) are distinguished on visible bands of the reflectance spectrum. 1600 nm, thereby a valley is revealed in the corresponding area of the diffuse reflectance spectrum [5]. 1300–1600 nm due to the absence of moisture All these differences make it easy highest reflection peak can reach over 30%. Cr2O3 All green camouflage coatings plants by traditional means of modern due to the absence of moisture.
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