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Monolayer Assembly of MultiSpiked Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy-Based Trace Detection of Dyes and Explosives
Date
2020-07-01
Author
Ahmed, Waqqar
Demirtas, Ozge
Öztürk, İbrahim Murat
Bek, Alpan
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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.
Subject Keywords
Explosive detection
,
Nanoparticle deposition
,
SERS
,
Coffee-ring effect
,
Gold nanostars
,
Gold nanoparticles
URI
https://hdl.handle.net/11511/40692
Journal
ACS APPLIED NANO MATERIALS
DOI
https://doi.org/10.1021/acsanm.0c01177
Collections
Department of Physics, Article
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W. Ahmed, O. Demirtas, İ. M. Öztürk, and A. Bek, “Monolayer Assembly of MultiSpiked Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy-Based Trace Detection of Dyes and Explosives,”
ACS APPLIED NANO MATERIALS
, pp. 6766–6773, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40692.