Silver nanoparticles embedded on mesoporous-silica modified reduced graphene-oxide nanosheets for SERS detection of uremic toxins and parathyroid hormone

Ruey Shin Juang, Yu Wei Cheng*, Wan Tzu Chen, Kuan Syun Wang, Chun Chieh Fu, Shou Hsuan Liu, Ru Jong Jeng, Cheng Cheung Chen, Ming Chien Yang, Ting Yu Liu

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

27 Scopus citations

Abstract

Silver nanoparticles (AgNPs) were successfully immobilized onto mesoporous silica (MPS)-modified reduced graphene oxide (mrGO) nanosheets to form AgNPs@mrGO surface-enhanced Raman scattering (SERS)-active substrates for bio-detection. Using the highly porous structure of MPS with the beneficial Raman enhancement of rGO nanosheets as templates, the homogeneous dispersion of AgNPs was self-assembled on a floating 2D platform of mrGO nanosheets. These were evaluated by transmission electron microscopy, X-ray diffraction, and UV–Vis spectroscopy. The pore-channels (~5 nm) of mrGO could be applied as templates to manipulate the interparticle gaps and particle size of AgNPs to obtain uniform nanoparticle arrays. Compared with AgNPs@mrGO and AgNPs@rGO (rGO substrate without MPS), the signal-to-background ratio (S/B ratio) was enhanced 6.9 times by mrGO addition. This indicates that the increase in SERS intensity and reduction in the background by using the template of the mrGO. AgNPs@mrGO SERS-active substrate can be exploited for rapid and sensitive detection of uremic toxins (creatinine, uric acid, and urea) and parathyroid hormone (PTH) for chronic kidney disease. The rapid, reproducible, and ultrasensitive detection of uremic toxins (<10−6 M of uric acid) and PTH (<0.2 ng/mL) could be achieved without labeling.

Original languageEnglish
Article number146372
JournalApplied Surface Science
Volume521
DOIs
StatePublished - 15 08 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • Mesoporous silica
  • Reduced graphene oxide
  • Silver nanoparticles
  • Surface-enhanced Raman scattering (SERS)

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