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<p>In this work, we explore a novel surface plasmon resonance biosensor featuring a 2D sandwich heterostructure composed of silver (Ag)@bismuth ferrite perovskites (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11468_2025_2855_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\({BiFeO}_{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mi mathvariant="italic">BiFeO</mi> </mrow> <mn>3</mn> </msub> </math></EquationSource> </InlineEquation>), x-phosphorus (x-blue, black), and graphene. This proposed biosensor is designed based on the Kretschmann configuration to detect diverse bacteria cell walls. In this study, Ag is utilized to excite surface plasmons, while BiFeO₃ and two-dimensional nanomaterials are integrated to improve sensing performance. Additionally, the angular interrogation technique based on the transfer matrix method (TMM) is employed to assess the sensor’s reflectance properties at plasmon resonance conditions. The proposed sensor is evaluated for various bacterial cells, achieving a maximum sensitivity of 310.5625°/RIU, detection accuracy (DA) of 2.34, and a quality factor (QF) of 97.45 /RIU. The comparative study reveals a unique combination of heterostructure enhances the sensor’s sensitivity, confirming its outstanding performance for the highly sensitive identification of various bacterial cells.</p>

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Developing 2D Sandwich Structures of Ag@BiFeO3/x-Phosphorus (x-Blue, Black)/Graphene-Assisted SPR Biosensors for Diverse Bacteria Cell Detection

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Bheemisetti Sriram,
  • Yesudasu Vasimalla,
  • Jyothsna Vaadaala,
  • Sourabh Jain,
  • Balaji Ramachandran,
  • Chella Santhosh,
  • Suman Maloji,
  • Santosh Kumar

摘要

In this work, we explore a novel surface plasmon resonance biosensor featuring a 2D sandwich heterostructure composed of silver (Ag)@bismuth ferrite perovskites ( \({BiFeO}_{3}\) BiFeO 3 ), x-phosphorus (x-blue, black), and graphene. This proposed biosensor is designed based on the Kretschmann configuration to detect diverse bacteria cell walls. In this study, Ag is utilized to excite surface plasmons, while BiFeO₃ and two-dimensional nanomaterials are integrated to improve sensing performance. Additionally, the angular interrogation technique based on the transfer matrix method (TMM) is employed to assess the sensor’s reflectance properties at plasmon resonance conditions. The proposed sensor is evaluated for various bacterial cells, achieving a maximum sensitivity of 310.5625°/RIU, detection accuracy (DA) of 2.34, and a quality factor (QF) of 97.45 /RIU. The comparative study reveals a unique combination of heterostructure enhances the sensor’s sensitivity, confirming its outstanding performance for the highly sensitive identification of various bacterial cells.