Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Optical Properties of Mid-infrared Transparent ZnS Ceramics with Different Molar Ratio of S/Zn

S/Zn의 몰비에 따른 중적외선 투과용 ZnS 세라믹스의 소결과 광학적 특성

  • Yeo, Seo-Yeong (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Park, Buem-Keun (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Chang-Il (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Paik, Jong-Hoo (Electronic Convergence Division, Korea Institute of Ceramic Engineering & Technology)
  • Received : 2019.07.04
  • Accepted : 2019.07.26
  • Published : 2019.07.31
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Abstract

In this study, mid-infrared transparent zinc sulfide (ZnS) ceramics were fabricated through hydrothermal synthesis with different molar ratios of S/Zn (S/Zn = 0.8, 1.0, 1.2, 1.4, and 1.6). The ZnS ceramics were sintered at a relatively low temperature of $850^{\circ}C$ to prevent the occurrence of the hexagonal phase featuring optical anisotropy. The phase composition, microstructure, and optical properties of the ZnS ceramics were subsequently investigated by employing X-ray diffraction, scanning electron microscopy, and Fouriertransform infrared spectroscopy. The results obtained indicate that the ZnS nanoparticles feature the cubic phase, without the hexagonal phase. Moreover, with increasing S, the crystallinity and particle size of the ZnS nanoparticles increased. The crystallinity and density of the ZnS ceramics improved when the molar ratio of S was higher than the molar ratio of Zn, thereby enhancing the transmittance. Furthermore, the ZnS ceramic with an S/Zn value of 1.2 was found to exhibit the highest transmittance of approximately 69% owing to the reduced occurrence of the hexagonal phase and a high density of 99.8%.

Keywords

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Fig. 1. Schematic diagram of the experimental process.

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Fig. 2. X-ray diffraction patterns of ZnS nanoparticles prepared by hydrothermal synthesis at a molar ratio of S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6 for 20 h at 220℃.

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Fig. 3. SEM image of ZnS nanoparticles prepared by hydrothermal synthesis at a molar ratio of S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6 for 20 h at 220℃.

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Fig. 4. Atomic percent of ZnS nanoparticles prepared by hydrothermal synthesis at a molar ratio of S/Zn = 0.8, 1.0, 1.2, 1.4 and 1.6 for 20 h at 220℃.

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Fig. 5. Photographs of ZnS ceramics processed by hot-pressing at 850℃ for 2 hours under 30 MPa with various molar ratio S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6

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Fig. 6. Density of ZnS ceramics processed by hot-pressing at 850℃ for 2 hours under 30 MPa with various molar ratio S/Zn = 0.8, 1.0, 1.2, 1.4, and 1.6

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Fig. 7. SEM images of ZnS ceramics processed by hot-pressing at 850℃ for 2 hours under 30 MPa with various molar ratio S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6

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Fig. 8. X-ray diffraction patterns of ZnS ceramics processed by hotpressing at 850℃ for 2 hours under 30 MPa with various molar ratio S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6

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Fig. 9. Infrared transmittance of ZnS ceramics processed by hotpressing at 850℃ for 2 hours under 30 MPa with various molar ratio S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6 (thickness : 1 mm)

Table 1. Infrared transmittance of ZnS ceramics processed by hotpressing at 850℃ for 2 hours under 30 MPa with various molar ratio S/Zn = (a) 0.8, (b) 1.0, (c) 1.2, (d) 1.4, and (e) 1.6 (thickness : 1mm)

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