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Title: Electrochemical sensors for the detection and quantification of toxic metal ions
Author: Suherman, Alex Lukmanto
ISNI:       0000 0004 8507 1077
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2019
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This thesis presents experimental work with the primary aim of developing sensors for the detection and quantification of the toxic metal ions Hg2+, Al3+, Zn2+, and Li+ through electrochemical methods. Chapter 1 describes the fundamentals of electrochemistry, including voltammetric and nano-impact methods. Chapter 2 provides information about chemical reagents, instrumentation and experimental procedures used in this thesis. Chapter 3 outlines the development of a sensor for inorganic Hg2+ in aqueous solution using silver nanoparticles with galvanic displacement under a suitable applied potential. Chapter 4 and Chapter 5 demonstrate the utilization of tannic acid (TA) as a capping agent of gold nanoparticles for the sensitive detection of Al3+ and Hg2+ toward complexation, respectively. Chapter 6 generalizes and extends these chapters, defining the role of the TA capping agent in the redox activity for Hg2+ and Zn2+ detection by using the nano-impact method. Chapter 7 outlines the electrochemical dissolution of the citrate-capped gold nanoparticle in cyanide-containing solution, where an understanding of the dissolution mechanism is of great importance for the optimization of gold nanoparticle recovery or refinery via oxidative cyanidation. Finally, Chapter 8 outlines the development of an electrochemical sensor for Li+ in authentic human saliva at lithium manganese oxide (LiMn2O4)-modified electrodes. The sensing strategy is based on an initial galvanostatic delithiation of LiMn2O4 followed by linear stripping voltammetry to detect Li+ in the sample. Overall, the sensing methodology reported in this thesis makes a significant contribution to the application of voltammetric methods for the detection and quantification of toxic metal ions. All sensors reported in this thesis are specifically suitable for routine environmental monitoring, for drinking water and food products quality assessment, or for clinical monitoring and diagnosis applications.
Supervisor: Compton, Richard G. Sponsor: LPDP Indonesia
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available