Decoupled in-plane Dipole Resonance Modulated Colorimetric Assay-Based Optical Ruler for Ultra-Trace Gold (Au) Detection

Decoupling of different plasmon resonance modes ( in-plane , and out-of-plane dipole and quadrupole resonances) by tuning nanoparticle’s size and shape offers a new field of plasmonics as colorimetric assay-based optical-ruler for ultra-trace sensing. Driven by its low cost, easy to perform and effi...

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Bibliographic Details
Published in:Scientific reports 2018-01, Vol.8 (1), p.868-10, Article 868
Main Authors: Mandal, Ajoy, Bhattacharya, Maireyee, Kuznetsov, Denis V., Ghosh, Tapas, Das Chakraborty, Sudeshna, Satpati, Biswarup, Mazov, Vsevolod, Senapati, Dulal
Format: Article
Language:English
Subjects:
639/301/357/354
639/624/1107/527
639/638/11/511
639/925/357/354
Ascorbic acid
Colorimetry
Gold
Humanities and Social Sciences
multidisciplinary
Nanoparticles
Ores
Resonance
Science
Science (multidisciplinary)
Silver
Silver mines
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Summary:Decoupling of different plasmon resonance modes ( in-plane , and out-of-plane dipole and quadrupole resonances) by tuning nanoparticle’s size and shape offers a new field of plasmonics as colorimetric assay-based optical-ruler for ultra-trace sensing. Driven by its low cost, easy to perform and efficient way to measure trace level (up to 30  ppt in presence of common mining elements in natural gold ore) abundance, this study develops a highly selective and ultrasensitive turn-on colorimetric sensor to detect gold-ion from environmental samples. Different level of gold-ion tracer makes size variable spherical- and disc-shaped silver nanoparticles when added to a ‘growth solution’ which results decoupling of in-plane dipole resonance from in-plane quadrupole and out-of-plane dipole resonances with a wide range of in-plane dipole plasmon tunability to generate different colors. This color-coded sensing of gold-ion shows high selectivity and ultrasensitivity over other metal ions in the ppt level with an impurity aberration limit of 1  ppm . A plausible explanation explains the possible role of catalytic gold-ion to initiate unfavorable silver ion (Ag + ) reduction by ascorbic acid to generate silver nanoparticles. Proposed technology has been applied in real mining sample (Bugunda Gold Deposit, Tajikistan) to detect gold concentration from ores to find potential application in mining technology.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-19148-w