Monolayer Assembly of MultiSpiked Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy-Based Trace Detection of Dyes and Explosives


Ahmed W., Demirtas O., ÖZTÜRK İ. M. , BEK A.

ACS APPLIED NANO MATERIALS, vol.3, no.7, pp.6766-6773, 2020 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 3 Issue: 7
  • Publication Date: 2020
  • Doi Number: 10.1021/acsanm.0c01177
  • Journal Name: ACS APPLIED NANO MATERIALS
  • Journal Indexes: Science Citation Index Expanded, Scopus, Compendex
  • Page Numbers: pp.6766-6773
  • Keywords: gold nanoparticles, gold nanostars, coffee-ring effect, SERS, nanoparticle deposition, explosive detection, SERS SUBSTRATE, CRYSTAL VIOLET, SILVER NANOPARTICLES, SCATTERING, SINGLE, ARRAYS, MICROSPHERES, ATTACHMENT, DEPOSITS, UNIFORM

Abstract

For sensitive and reproducible surface-enhanced Raman scattering (SERS)-based trace detection, a SERS platform with high concentration of homogeneously distributed hotspots is needed. Herein, we report a facile monolayer assembly of multispiked gold nanoparticles (MSGNPs) of various sizes over a large area. The assembly was achieved simply by tuning the concentration of MSGNPs in a suspension and subsequently drying it on a substrate under ambient conditions. A monolayer assembly for MSGNP sizes ranging from 150 to 640 nm has been demonstrated. The MSGNP assembly showed excellent sensitivity and uniformity of SERS-based trace detection, owing to the presence of high concentration of uniformly distributed interparticle and intraparticle hotspots. In particular, detection of 10 fM of a toxic dye, crystal violet, has been demonstrated. Moreover, ammonium nitrate, which is a commonly used material for homemade explosives, was detected at 1 mu M level. The MSGNP-based SERS platforms have great potential for applications in sensitive and reliable toxin and explosive detection.