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<p>Polymer optical fibers (POFs) have been functionalized by doping for applications ranging from sensing to active fiber optic devices. Among various doping techniques, the solution doping of POFs by photoactive organic dyes is preferred because the process is carried out at much lower temperature without the hot-drawing procedure after doping. Previously, the aqueous solution is proposed to address the problem that the methanol-based doping process has detrimental effects on POFs. However, the speed of the doping process in aqueous solutions still needs improvement for practical applications. To accelerate the POF doping by rhodamine B in aqueous solutions, this study proposes to introduce electrolytes into doping solutions, since it has been well-known that electrolytes can influence ionization equilibrium of rhodamine B. Results show that addition of KCl and several other electrolytes into aqueous solutions can accelerate the doping process and the acceleration effect depends on doping temperatures. For the same doping time and temperature, the doping concentration of rhodamine B in POFs with addition of KCl is much higher than that without it. For example, the doping concentration is only 0.026&#xa0;mg/g for the POF doped without KCl for 6&#xa0;h at 70 ℃, but with 15% KCl in the doping solution, the doping concentration surges to 0.364&#xa0;mg/g for the same doping time and temperature, an increase of 14 times. In addition, it is found that the doping process up to 80 ℃ has no adverse effects on the fiber loss. Therefore, introducing electrolytes into the aqueous doping solution is an effective and facile approach to accelerate the doping process of PMMA based POFs by rhodamine B, making the solution doping technique more promising and applicable, though whether the finding applies to other dyes and POFs based on other polymers needs further investigation.</p>

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Electrolytes assisted solution doping of PMMA polymer optical fibers by Rhodamine B

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Yinhua Ma,
  • Zhiling Li,
  • Yanan Ye,
  • Wenfei Dong,
  • Zhi Feng Zhang

摘要

Polymer optical fibers (POFs) have been functionalized by doping for applications ranging from sensing to active fiber optic devices. Among various doping techniques, the solution doping of POFs by photoactive organic dyes is preferred because the process is carried out at much lower temperature without the hot-drawing procedure after doping. Previously, the aqueous solution is proposed to address the problem that the methanol-based doping process has detrimental effects on POFs. However, the speed of the doping process in aqueous solutions still needs improvement for practical applications. To accelerate the POF doping by rhodamine B in aqueous solutions, this study proposes to introduce electrolytes into doping solutions, since it has been well-known that electrolytes can influence ionization equilibrium of rhodamine B. Results show that addition of KCl and several other electrolytes into aqueous solutions can accelerate the doping process and the acceleration effect depends on doping temperatures. For the same doping time and temperature, the doping concentration of rhodamine B in POFs with addition of KCl is much higher than that without it. For example, the doping concentration is only 0.026 mg/g for the POF doped without KCl for 6 h at 70 ℃, but with 15% KCl in the doping solution, the doping concentration surges to 0.364 mg/g for the same doping time and temperature, an increase of 14 times. In addition, it is found that the doping process up to 80 ℃ has no adverse effects on the fiber loss. Therefore, introducing electrolytes into the aqueous doping solution is an effective and facile approach to accelerate the doping process of PMMA based POFs by rhodamine B, making the solution doping technique more promising and applicable, though whether the finding applies to other dyes and POFs based on other polymers needs further investigation.