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<p>This study introduces a precise peristaltic-pump-based strategy to control SiO<sub>2</sub> shell thickness, enabling a comparative evaluation of both surface enhanced Raman spectroscopy (SERS) and surface enhanced electrochemiluminescence (SEECL) performance in the novel Ag/PATP@SiO<sub>2</sub>-NH<sub>2</sub>/CdS core–shell nanostructure. A meticulous multi-step synthesis was employed, wherein the SiO<sub>2</sub> shell thickness was precisely regulated from 2.2 to 24.2&#xa0;nm by controlling the infusion rate (0.4 mL/min) and dosage of tetraethoxysilane (TEOS) using a peristaltic pump. This allowed us to systematically investigate the modulation of both SERS and SEECL signals by the engineered shell thickness. The results reveal a strong optical enhancement dependence on the SiO<sub>2</sub> shell thickness: a 5.5&#xa0;nm shell yielded an optimal SERS relative enhancement factor of 147 for the <i>p</i>, <i>p</i>’-dimercaptoazobenzene (DMAB) molecule converted from <i>p</i>-aminothiophenol (PATP), while a 10.3&#xa0;nm shell provided an optimal SEECL relative enhancement factor of 88 for Ag/PATP@10.3&#xa0;nm SiO<sub>2</sub>-NH<sub>2</sub>/CdS, compared to Ag/PATP@0 nm SiO<sub>2</sub>-NH<sub>2</sub>/CdS. These enhancement effects are attributable to the precisely engineered SiO<sub>2</sub> shell: its thickness optimizes the intensity and distribution of the localized surface plasmon resonance (LSPR) of the Ag core, thereby maximizing the SERS signal; concurrently, it provides an optimal separation for the SEECL process, effectively balancing the electromagnetic enhancement and the quenching effects induced by Förster resonance energy transfer. This work establishes a precise pump-based methodology for SiO<sub>2</sub> shell thickness control and provides critical insights for designing advanced multifunctional plasmonic nanoplatforms.</p>

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Precise pump control of SiO2 shell thickness enables systematic comparison of SERS and SEECL performance in core–shell nanostructures

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Xueyuan Li,
  • Cong Chen,
  • Xinyao Yang,
  • Dean Fang

摘要

This study introduces a precise peristaltic-pump-based strategy to control SiO2 shell thickness, enabling a comparative evaluation of both surface enhanced Raman spectroscopy (SERS) and surface enhanced electrochemiluminescence (SEECL) performance in the novel Ag/PATP@SiO2-NH2/CdS core–shell nanostructure. A meticulous multi-step synthesis was employed, wherein the SiO2 shell thickness was precisely regulated from 2.2 to 24.2 nm by controlling the infusion rate (0.4 mL/min) and dosage of tetraethoxysilane (TEOS) using a peristaltic pump. This allowed us to systematically investigate the modulation of both SERS and SEECL signals by the engineered shell thickness. The results reveal a strong optical enhancement dependence on the SiO2 shell thickness: a 5.5 nm shell yielded an optimal SERS relative enhancement factor of 147 for the p, p’-dimercaptoazobenzene (DMAB) molecule converted from p-aminothiophenol (PATP), while a 10.3 nm shell provided an optimal SEECL relative enhancement factor of 88 for Ag/PATP@10.3 nm SiO2-NH2/CdS, compared to Ag/PATP@0 nm SiO2-NH2/CdS. These enhancement effects are attributable to the precisely engineered SiO2 shell: its thickness optimizes the intensity and distribution of the localized surface plasmon resonance (LSPR) of the Ag core, thereby maximizing the SERS signal; concurrently, it provides an optimal separation for the SEECL process, effectively balancing the electromagnetic enhancement and the quenching effects induced by Förster resonance energy transfer. This work establishes a precise pump-based methodology for SiO2 shell thickness control and provides critical insights for designing advanced multifunctional plasmonic nanoplatforms.