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<p>The electrospinning technique was used to produce the aligned optically nonlinear organic HMT-PVA nanofibers with a weight ratio of 1:2. The smooth fibers were formed with an average diameter of 170.65&#xa0;nm, according to the scanning electron microscopic (SEM) analysis. The X-ray diffraction (XRD) study verified the preferred crystallographic orientation of HMT molecules inside the nanofibers, and the average crystallite size was determined to be 15.55&#xa0;nm. The Fourier Transform Infrared (FTIR) spectroscopic study identified different functional groups present in the synthesized samples. The enhancement of thermal stability of the HMT crystals in the guest–host system was observed from Thermogravimetric and Differential Thermogravimetric analysis (TG–DTG). The transparency of the HMT-PVA nanofiber samples in the entire visible region was studied using Ultraviolet–visible (UV–Vis) absorption spectroscopic study and the optical band gap obtained from the Tauc plot is 5.46&#xa0;eV. The Kurtz–Perry powder technique confirms that the efficiency of second harmonic generation (SHG) for the HMT-PVA nanofiber is 1.54 times that of reference KDP crystals, and that it can be an alternative for frequency conversion applications in miniaturized devices. The investigation on the nonlinear absorption coefficient (NLA), nonlinear refraction (NLR), and third-order nonlinear susceptibility was carried out using Z-scan studies.</p>

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Fabrication, morphological, and nonlinear optical studies of electrospun hexamethylenetetramine-polyvinyl alcohol (HMT-PVA) nanofiber

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Kintali Manohor Prasad,
  • S. Divagar,
  • P. Srinivasan

摘要

The electrospinning technique was used to produce the aligned optically nonlinear organic HMT-PVA nanofibers with a weight ratio of 1:2. The smooth fibers were formed with an average diameter of 170.65 nm, according to the scanning electron microscopic (SEM) analysis. The X-ray diffraction (XRD) study verified the preferred crystallographic orientation of HMT molecules inside the nanofibers, and the average crystallite size was determined to be 15.55 nm. The Fourier Transform Infrared (FTIR) spectroscopic study identified different functional groups present in the synthesized samples. The enhancement of thermal stability of the HMT crystals in the guest–host system was observed from Thermogravimetric and Differential Thermogravimetric analysis (TG–DTG). The transparency of the HMT-PVA nanofiber samples in the entire visible region was studied using Ultraviolet–visible (UV–Vis) absorption spectroscopic study and the optical band gap obtained from the Tauc plot is 5.46 eV. The Kurtz–Perry powder technique confirms that the efficiency of second harmonic generation (SHG) for the HMT-PVA nanofiber is 1.54 times that of reference KDP crystals, and that it can be an alternative for frequency conversion applications in miniaturized devices. The investigation on the nonlinear absorption coefficient (NLA), nonlinear refraction (NLR), and third-order nonlinear susceptibility was carried out using Z-scan studies.