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<p>Sensing of explosive molecules for defence application was done using freely positionable and fibre coupled Raman probe. We developed the highly sensitive Ag-based array of surface enhanced Raman substrate (SERS) using a nanoimprint lithography. A limit of detection (LOD) as low as 10<sup>–9</sup> M for Cyclotetramethylene-tetranitramine (HMX) was achieved with long distance detection of 10 m. The optical fibre length could be customized from 1 to 10 m. This is the upcoming remote technique for sensing, using fibre coupled Raman probe, containing 20x objective present just in front of the optical fibre, so that the background signal does not dominates. An enhancement factor of 3.11 × 10<sup>6</sup> was achieved with the limit of detection as 10<sup>–9</sup> M and it finds useful application in defence and medical field.</p>

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Demonstration of a freely positionable fibre-optic coupled probe for SERS-based sensing of an explosive analyte over a Ag nanopyramid substrate fabricated by nanoimprint lithography

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Preeti Garg,
  • Rakesh S Moirangthem,
  • Anindita Das

摘要

Sensing of explosive molecules for defence application was done using freely positionable and fibre coupled Raman probe. We developed the highly sensitive Ag-based array of surface enhanced Raman substrate (SERS) using a nanoimprint lithography. A limit of detection (LOD) as low as 10–9 M for Cyclotetramethylene-tetranitramine (HMX) was achieved with long distance detection of 10 m. The optical fibre length could be customized from 1 to 10 m. This is the upcoming remote technique for sensing, using fibre coupled Raman probe, containing 20x objective present just in front of the optical fibre, so that the background signal does not dominates. An enhancement factor of 3.11 × 106 was achieved with the limit of detection as 10–9 M and it finds useful application in defence and medical field.