Au@SiO2 core/shell nanoparticle assemblage used for highly sensitive SERS-based determination of glucose and uric acid

Tran Thi Bich Quyen, Wei Nien Su, Kuan Jung Chen, Chun Jern Pan, John Rick, Chun Chao Chang, Bing Joe Hwang

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

The use of Au@SiO2 core/shell nanoparticle (NP) assemblage with highly sensitive surface-enhanced Raman scattering (SERS) was investigated for the determination of glucose and uric acid in this study. Rhodamine 6G dye molecules were used to evaluate the SERS enhancement factor for the synthesized Au@SiO2 core/shell NPs with various silica shell thicknesses. The enhancement of SERS signal from Rhodamine 6G was found to increase with a decrease in the shell thickness. The core/shell assemblage with silica layer of 1-2 nm over a Au NP of ∼36 nm showed the highest SERS signal. Our results show that the SERS technique is able to detect glucose and uric acid within wide concentration ranges, i.e. 20 ng/dL to 20 mg/dL (10-12-10 -3 M) and 16.8 ng/dL to 2.9 mg/dL (10-11-1.72 × 10-4 M), respectively, with associated lower detection limits of ∼20 ng/dL (∼1.0 × 10-12 M) and ∼16.8 ng/dL (∼1.0 × 10-11 M). Our work offers a low-cost route to the fabrication of agile sensing devices applicable to the monitoring of disease progression.

Original languageEnglish
Pages (from-to)1671-1677
Number of pages7
JournalJournal of Raman Spectroscopy
Volume44
Issue number12
DOIs
Publication statusPublished - Dec 2013

Keywords

  • Au@SiO core/shell nanoparticles (Au@SiO NPs)
  • glucose
  • Rhodamine 6G (R6G)
  • SERS
  • uric acid

ASJC Scopus subject areas

  • Spectroscopy
  • Materials Science(all)

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