Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate

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  • Kristina Gudun
    Chemistry Department, SST Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Astana, Kazakhstan
  • Zarina Elemessova
    Chemistry Department, SST Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Astana, Kazakhstan
  • Laura Khamkhash
    Chemistry Department, SST Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Astana, Kazakhstan
  • Ekaterina Ralchenko
    Chemistry Department, SST Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Astana, Kazakhstan
  • Rostislav Bukasov
    Chemistry Department, SST Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Astana, Kazakhstan

Description

<jats:p>We introduce low-cost, tunable, hybrid SERS substrate of commercial gold nanoparticles on untreated aluminum foil (AuNPs@AlF). Two or three AuNP centrifugation/resuspension cycles are proven to be critical in the assay preparation. The limits of detection (LODs) for<jats:italic> 4</jats:italic>-nitrobenzenethiol (NBT) and crystal violet (CV) on this substrate are about 0.12 nM and 0.19 nM, respectively, while maximum analytical SERS enhancement factors (AEFs) are about 10<jats:sup>7</jats:sup>. In comparative assays LODs for CV measured on AuNPs@Au film and AuNPs@glass are about 0.35 nM and 2 nM, respectively. The LOD for melamine detected on AuNPs@ Al foil is 27 ppb with 3 orders of magnitude for linear response range. Overall, AuNPs@AlF demonstrated competitive performance in comparison with AuNPs@ Au film substrate in SERS detection of CV, NBT, and melamine. To check the versatility of the AuNPs@AlF substrate we also detected KNO<jats:sub>3</jats:sub> with LODs of 0.7 mM and SERS EF around 2 × 10<jats:sup>3</jats:sup>, which is on the same order with SERS EF reported for this compound in the literature.</jats:p>

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