Scholarlink

<p>Flexile SERS substrates accompany distinct advantages for real-time detection, not only because of their high porosity but also because of their ability to adapt to irregular surfaces and withstand bending or movement, making them ideal for practical, on-the-go sensing applications. In this study, we have explored the surface-enhanced Raman scattering (SERS) efficiency of femtosecond laser–ablated plasmonic nanoparticle-decorated highly hydrophobic flexible PMMA nanofibers achieved using the electrospinning technique. This work includes the details of the fabrication of flexible substrates by combining electrospun PMMA polymer nanofibers with femtosecond pulse laser–ablated pure gold (Au) and bimetallic (Au–Ag) NPs. Hydrophobic PMMA fibers were functionalized by drop-casting plasmonic-active Au and Au–Ag NPs for the SERS studies. A micro-Raman spectrometer (M/s Horiba) was used for the SERS data acquisition for two dye molecules, Nile blue (NB) and malachite green (MG). Au-loaded PMMA fibers detected up to 50&#xa0;nM concentration of Nile blue with an enhancement factor of 2.27 × 10<sup>4</sup> and 200&#xa0;nM concentration of MG with an enhancement factor of 1.03 × 10<sup>4</sup>. Also demonstrated good reproducibility with <i>R</i><sup>2</sup> values of 9.59% and 10.77% for NB (5&#xa0;µM) and MG (5&#xa0;µM), respectively. Similarly, PMMA-Au–Ag substrates detected NB with a 10&#xa0;nM concentration and MG with a 100&#xa0;nM concentration as the lowest detection. The corresponding enhancement factors obtained were 4.41 × 10<sup>4</sup> and 2.93 × 10<sup>5</sup>, respectively. The PMMA-Au–Ag substrate showed reproducibility of 12.63% and 14.63% for NB (5&#xa0;µM) and MG (5&#xa0;µM), respectively.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Gold and Gold–Silver Alloy Nanoparticle-Functionalized PMMA Nanofibers for Ultrasensitive SERS-Based Detection of Nile Blue and Malachite Green

  • 期刊论文

  • 发表日期：

    2025年10月14日

查看全文
  • Niharika Pradhan,
  • Venugopal Rao Soma

摘要

Flexile SERS substrates accompany distinct advantages for real-time detection, not only because of their high porosity but also because of their ability to adapt to irregular surfaces and withstand bending or movement, making them ideal for practical, on-the-go sensing applications. In this study, we have explored the surface-enhanced Raman scattering (SERS) efficiency of femtosecond laser–ablated plasmonic nanoparticle-decorated highly hydrophobic flexible PMMA nanofibers achieved using the electrospinning technique. This work includes the details of the fabrication of flexible substrates by combining electrospun PMMA polymer nanofibers with femtosecond pulse laser–ablated pure gold (Au) and bimetallic (Au–Ag) NPs. Hydrophobic PMMA fibers were functionalized by drop-casting plasmonic-active Au and Au–Ag NPs for the SERS studies. A micro-Raman spectrometer (M/s Horiba) was used for the SERS data acquisition for two dye molecules, Nile blue (NB) and malachite green (MG). Au-loaded PMMA fibers detected up to 50 nM concentration of Nile blue with an enhancement factor of 2.27 × 104 and 200 nM concentration of MG with an enhancement factor of 1.03 × 104. Also demonstrated good reproducibility with R2 values of 9.59% and 10.77% for NB (5 µM) and MG (5 µM), respectively. Similarly, PMMA-Au–Ag substrates detected NB with a 10 nM concentration and MG with a 100 nM concentration as the lowest detection. The corresponding enhancement factors obtained were 4.41 × 104 and 2.93 × 105, respectively. The PMMA-Au–Ag substrate showed reproducibility of 12.63% and 14.63% for NB (5 µM) and MG (5 µM), respectively.