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A new route for the preparation of CoAl2O4 nanoblue pigments with high uniformity and its optical properties

  • Original Paper: Sol-gel and hybrid materials for optical, photonic and optoelectronic applications
  • Published:
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Abstract

Gamma-ray irradiation assisted polyacrylamide gel route was used to prepare CoAl2O4 nanoblue pigments. In this route, citric acid was used as a carboxyl and hydroxyl type chelating agent. The phase purity, morphology, and optical and fluorescence properties of as-prepared samples were analyzed via X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectrometer, transmission electron microscopy (TEM), UV–Visible spectrophotometer, and a confocal Raman system. XRD analysis indicates that the xerogel sintered at relatively low temperature (500 °C) to obtain single phase CoAl2O4 nanopowders. The primary crystal of CoAl2O4 nanoblue pigment is only 28 nm characterized by TEM, which is more likely to be realized with high uniformity than that the CoAl2O4 nanopowders prepared by conventional polyacrylamide gel route. Optical properties of CoAl2O4 nanoblue pigment shows that the optical energy gap (Eg) of nanoblue pigment increases with the decrease of crystallite size. The CIE parameter of CoAl2O4 nanoblue pigment indicates that a different sintering temperature causes a variation in the color of nanoparticles. The fluorescence spectra show that a major blue emission band around 400 nm and a weaker side band located at 430 nm are observed when the excitation wavelength is 325 nm. The chelation mechanism and fluorescence mechanism of the CoAl2O4 nanoblue pigment have been analyzed based on the experimental results.

A cubic nano-CoAl2O4 pigments were synthesized by γ-ray irradiation assisted polyacrylamide gel route. The nano-CoAl2O4 pigments with high uniformity than that the CoAl2O4 nanopowders prepared by conventional polyacrylamide gel route. The SAED pattern revealed that the CoAl2O4 nanoparticles possess interplanar spacing of 2.8651, 2.4434, 2.0258, 1.5586, 1.4327, 1.3657, and 1.1549 Å corresponding to the (220), (311), (400), (511), (440), (531), and (444) planes, respectively. The UV–Vis absorption spectrum shows three obvious absorption peaks at 551, 590, and 628 nm and the CIE parameter is consistent with the real photos.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51662027, and 61540043).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, 730050, Lanzhou, China

    Huajing Gao, Hua Yang & Fei Wang

  2. School of Science, Lanzhou University of Technology, 730050, Lanzhou, China

    Huajing Gao, Hua Yang & Fei Wang

  3. Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, 730000, Lanzhou, Gansu, China

    Shifa Wang, Danming Li & Yuhua Xiao

  4. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 621900, Mianyang, Sichuan, China

    Shifa Wang, Leiming Fang & Guixia Yang

  5. Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, China

    Li Lei

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  1. Huajing Gao
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  2. Hua Yang
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  3. Shifa Wang
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  4. Danming Li
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  5. Fei Wang
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  8. Yuhua Xiao
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Correspondence to Hua Yang or Shifa Wang.

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Highlights

  • CoAl2O4 nanoblue pigments were prepared by γ-ray irradiation assisted polyacrylamide gel route.

  • CoAl2O4 nanoblue pigments with high uniformity.

  • Sintering temperature causes a variation in the color and Eg value of CoAl2O4 nanoparticles.

  • The chelation and fluorescence mechanisms of the CoAl2O4 nanoblue pigment have been analyzed.

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Gao, H., Yang, H., Wang, S. et al. A new route for the preparation of CoAl2O4 nanoblue pigments with high uniformity and its optical properties. J Sol-Gel Sci Technol 86, 206–216 (2018). https://doi.org/10.1007/s10971-018-4609-y

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  • DOI: https://doi.org/10.1007/s10971-018-4609-y

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