Design of an Optoelectronic Tongue Based on Anti-Aggregation of Gold Nanoparticles for Detection and Classification of Heavy Metal Ions

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Najafzadeh, Fatemeh | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 51280 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Hormozi-Nezhad, Mohammad Reza
Abstract:
The ﬁrst report of anti-aggregation-based sensor arrays is presented. The strategy is based on the competitive interaction of citrate-capped gold nanoparticles (AuNPs) and heavy metal ions (i.e., Hg(II), Ag(I), Fe(III), and Pb (II)) with three aggregation reagents (i.e., cysteine, melamine, and arginine). In the presence of aggregation reagent,the color and UV–vis spectra of AuNPs are changed indicating the aggregation ofAuNPs. Addition of the aggregation reagents which are ﬁrstly treated with the ions, causes AuNPs turn from the aggregation to the dispersion state. The anti-aggregation capability of ions towards various aggregation reagents is diﬀerent because of distinct stability constants of ion-aggregation reagent complexes. The combinatorial colorimetric response of all sensor elements enables discrimination among the ions in various concentrations, as well as mixtures of them by linear discriminant analysis (LDA). Moreover, heavy metal ions are well-distinguished in river and ﬁsh samples with an accuracy of 100%
Keywords:
Gold Nanoparticle ; Heavy Metals ; Metal Ions ; Colorimetric Sensor ; Colorimetric Sensor Array ; Anti-Windup

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