Bimetallic Ag–Au alloy nanocubes for SERS based sensitive detection of explosive molecules

Content Provider	Scilit
Author	Kumar, Govind Soni, Ravi Kant
Copyright Year	2020
Description	Journal: Nanotechnology We have fabricated Ag–Au alloy nanocubes using the galvanic replacement of silver nanocubes by aqueous $HAuCl_{4}$ and investigated their morphological, structural, compositional and optical properties. The inter-diffusion between silver and gold at 100 °C leads to the formation of Ag–Au alloy nanocubes with hollow interiors. A broad tuning of the surface plasmon resonance (SPR) wavelength from 624 nm to 920 nm is obtained with the varying volume of $HAuCl_{4}$. When excited at wavelength 785 nm, the bimetallic Ag–Au nanocubes with pinholes exhibit two-fold Raman intensity enhancement compared to pristine Ag nanocubes. The surface-enhanced Raman spectroscopy (SERS) substrate prepared with Ag–Au alloy nanocubes shows high-intensity enhancement factor of 1.9 × $10^{7}$ for 11.2 wt% Au content. The SERS-active Ag–Au alloy nanocubes substrates were exploited for the detection of two explosive molecules; p-nitrobenzoic acid (PNBA) and picric acid (PA). Remarkable detection sensitivity and ultra-low detection limit of 1.7 × $10^{–14}$ M for PNBA and 4.1 × $10^{–11}$ M for PA were obtained, demonstrating the very high SERS detection capabilities of the as-prepared substrate.
Related Links	https://iopscience.iop.org/article/10.1088/1361-6528/abb628/pdf
ISSN	09574484
e-ISSN	13616528
DOI	10.1088/1361-6528/abb628
Journal	Nanotechnology
Issue Number	50
Volume Number	31
Language	English
Publisher	IOP Publishing
Publisher Date	2020-09-08
Access Restriction	Open
Subject Keyword	Journal: Nanotechnology Raman Spectroscopy Au Alloy Nanocubes Explosive Molecules
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering