Synthesis and Optical Properties of Copper Doped Y2Ba2O5 Pigments with High Near-infrared Reflectance

doi:10.15541/jim20150562

Abstract

Abstract:

A series of environmentally benign near-infrared reflective green nano-pigments were synthesized via Sol-Gel method with a general formula of Y₂Ba_(2-_x₎Cu_xO₅(x=0, 0.25, 0.50, 0.75 and 1.0). The crystal structure, morphology and optical properties of the synthesized pigments were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis-NIR diffuse reflectance spectra, and high accuracy spectrophotometer. Analysis results demonstrated that Cu ion was successfully introduced into the Y₂Ba₂O₅lattice of which grain size decreased from 62.1 nm to 54.7 nm. The systematic substitution of Cu²⁺for Ba²⁺in Y₂Ba₂O₅ changed color from white to green (a*=-21.61) and decreased band gap from 2.30 eV to 2.04 eV. These pigment samples revealed the uniform spherical-like morphology with an average size of 150-300 nm. When Cu²⁺ was introduced, the infrared reflectance of pigment sample was decreased. However, the pigment still displayed high near infrared reflectance (68.80%) and solar reflectance (45.95%), while the doping of Cu²⁺ up to x=0.50. Therefore, such green high near-infrared reflectance from these Y₂Ba₍₂_-x₎Cu_xO₅ powders have great potential in serving as cool pigments for building coatings.

Key words: Sol-Gel, green pigment, near-infrared reflectance, band gap

CLC Number:

TQ174

JIANG Jun, YAO Bo-Long, GAO Xv-Rui, WANG Li-Kui, LI Hong-Ping, DENG Li-Duo. Synthesis and Optical Properties of Copper Doped Y₂Ba₂O₅Pigments with High Near-infrared Reflectance[J]. Journal of Inorganic Materials, 2016, 31(6): 641-646.

Figures/Tables 10

Fig. 1 Powder X-ray diffraction patterns of Y2Ba(2-x)CuxO5(x=0-1.0) (a) and the expanded XRD patterns in the 2θ range of 28.0°-31.3° (b)

Table 1 Lattice parameters and crystallite size of the Y2Ba(2-x)CuxO5(x=0-1.0) powder

Pigment composition Y₂Ba_(2-_x)Cu_xO₅	Lattice parameter/nm			Crystallite size /nm
Pigment composition Y₂Ba_(2-_x)Cu_xO₅	a	b	c	Crystallite size /nm
x=0	0.4377 1.2210 1.2201 1.2183 1.2176	0.4377	1.1852	62.1 61.0 59.8 56.5 54.7
x=0.25		0.5602	0.7121
x=0.50		0.5629	0.7124
x=0.75		0.5642	0.7129
x=1.0		0.5655	0.7130

Fig. 2 Raman spectra of Y2Ba(2-x)CuxO5(x=0-1.0) green pigments

Fig. 3 FESEM images of Y2Ba2O5 (A), Y2Ba1.5Cu0.5O5 (B) and Y2BaCuO5 (C)

Fig. 4 Photographs of Y2Ba(2-x)CuxO5(x=0-1.0) powder pigments

Table 2 Color coordinates and band gap of the Y2Ba(2-x)CuxO5(x=0-1.0) powder pigments

Pigment Y₂Ba_(2-_x₎Cu_xO₅	Color coordinates				Band gap /eV
Pigment Y₂Ba_(2-_x₎Cu_xO₅	L*	a*	b*	C*	Band gap /eV
x=0	90.83	-1.76	12.68	12.76	2.30 2.16 2.08 2.04 2.04
x=0.25	58.13	-13.83	11.37	17.90
x=0.50	56.40	-17.09	10.29	19.95
x=0.75	54.03	-18.67	11.53	21.94
x=1.0	51.86	-21.61	4.50	22.07

Fig. 5 UV-Vis diffuse reflectance spectra of Y2Ba(2-x)CuxO5 (x= 0-1.0) powder pigments

Table 3 Values of NIR reflectance and solar reflectance of Y2Ba(2-x)CuxO5(x=0-1.0) powder pigments

Pigment Y₂Ba_(2-_x₎Cu_xO₅	x=0	x=0.25	x=0.50	x=0.75	x=1.0
NIR reflectance/%	85.87	70.53	68.80	67.32	56.38
Solar reflectance, R*/%	63.78	47.49	45.95	42.07	38.83

Fig. 6 NIR reflectance spectra of Y2Ba(2-x)CuxO5 (x=0-1.0) powder pigments

Fig. 7 NIR solar reflectance spectra of Y2Ba(2-x)CuxO5 (x= 0-1.0) powder pigments

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Synthesis and Optical Properties of Copper Doped Y₂Ba₂O₅Pigments with High Near-infrared Reflectance

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