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<p>Carbon dots/poly(methyl methacrylate) composite nanofibers (CDs/PMMA-CNFs) were fabricated via electrospinning for ultraviolet (UV) photoconductive sensing applications. Carbon dots were synthesized through a microwave-assisted method using citric acid and urea precursors and subsequently embedded within a PMMA nanofibrous matrix. Structural and morphological characterization was performed using FTIR, XRD, and SEM analyses, confirming successful incorporation of CDs into uniform nanofibers. Optical investigations using UV–Vis and photoluminescence spectroscopy revealed characteristic π–π* and n–π* transitions and excitation-independent emission centered near ~ 495 nm. The fabricated composite exhibited measurable photoconductive response under UV illumination (~ 395 nm), with current increasing from 4.48 × 10<sup>−8</sup> A (dark) to 4.83 × 10<sup>−8</sup> A (UV), corresponding to approximately 7.8% photocurrent enhancement. The device demonstrated rapid response and recovery times of ~ 7 ms, along with stable and repeatable ON/OFF switching at room temperature.These results establish a proof-of-concept flexible nanofiber-based UV photoconductive platform and demonstrate the feasibility of CDs/polymer composites for lightweight optoelectronic sensing, although further optimization is required to enhance device performance.</p>

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Electrospun luminescent carbon dots and poly methyl methacrylate composite nanofibers (CDs/PMMA-CNFs) for their potential applications in UV sensing

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Juvaria Bibi,
  • Muhammad Uzair,
  • Mubashir Hussain,
  • Muhammad Ali,
  • Salma Alshehri,
  • Vineet Tirth,
  • Ali Algahtani,
  • Saleha Qissi,
  • Wafa S. Aljuaid,
  • Essam A. Al-Ammar,
  • Nasir Rahman,
  • Q. Humayun

摘要

Carbon dots/poly(methyl methacrylate) composite nanofibers (CDs/PMMA-CNFs) were fabricated via electrospinning for ultraviolet (UV) photoconductive sensing applications. Carbon dots were synthesized through a microwave-assisted method using citric acid and urea precursors and subsequently embedded within a PMMA nanofibrous matrix. Structural and morphological characterization was performed using FTIR, XRD, and SEM analyses, confirming successful incorporation of CDs into uniform nanofibers. Optical investigations using UV–Vis and photoluminescence spectroscopy revealed characteristic π–π* and n–π* transitions and excitation-independent emission centered near ~ 495 nm. The fabricated composite exhibited measurable photoconductive response under UV illumination (~ 395 nm), with current increasing from 4.48 × 10−8 A (dark) to 4.83 × 10−8 A (UV), corresponding to approximately 7.8% photocurrent enhancement. The device demonstrated rapid response and recovery times of ~ 7 ms, along with stable and repeatable ON/OFF switching at room temperature.These results establish a proof-of-concept flexible nanofiber-based UV photoconductive platform and demonstrate the feasibility of CDs/polymer composites for lightweight optoelectronic sensing, although further optimization is required to enhance device performance.