Simultaneous Electrochemical Formation of Porous Silicon and Noble NPs for Au Nucleation Sites in SERS Substrates
Chia-Chi Lu, Hsiao-Han Hsu, I-An Lin, Vincent K. S. Hsiao, Chih-Chien Chu
TL;DR
This paper introduces a one-step method to create SERS substrates by forming porous silicon and noble metal nanoparticles simultaneously, improving reusability and spectral quality.
Contribution
A novel one-step electrochemical strategy for creating bimetallic SERS substrates with enhanced reusability and spectral precision.
Findings
HAuCl4-treated substrates achieved the highest Raman intensity.
K2PtCl4-treated substrates showed superior spectral quality with minimal fluorescence.
Pt-assisted substrates demonstrated stable performance over multiple cycles.
Abstract
This study presents a one-step electrochemical etching strategy that enables the simultaneous formation of porous silicon (PSi) and in situ deposition of noble metal nanoparticles (NPs), which subsequently act as nucleation sites for gold growth to form bimetallic SERS substrates. Three metal precursorsK2PtCl4, HAuCl4, and K2PdCl4were systematically compared to elucidate how precursor type affects PSi morphology, nanoparticle distribution, and subsequent gold deposition. SEM and EDS analyses revealed distinct deposition behaviors among the metals, leading to varied gold nucleation efficiencies and SERS enhancement levels. HAuCl4-treated substrates produced the highest absolute Raman intensity, while K2PtCl4-treated substrates exhibited lower intensity but superior spectral quality with minimal fluorescence background and sharper peaks. XRD and XPS confirmed successful gold deposition…
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Taxonomy
TopicsSilicon Nanostructures and Photoluminescence · Nanowire Synthesis and Applications · Gold and Silver Nanoparticles Synthesis and Applications