Synthesis of amine-functionalized and nitrogen-doped Graphene Quantum Dots and their applications in heavy metal ions sensing
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Dordanihaghighi, Sara
issued: 2021-07-26T21:19:59Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Rapid growth in industry and the improper disposal of pollutants have led to the contamination of the environment and humans’ food chains by heavy metal ions. The accumulation of heavy metal ions in living organisms results in lethal diseases such as cardiovascular diseases, heart failure, and cancer. Therefore, sensing and eliminating heavy metal ions have attracted researchers’ attention in recent years. Graphene Quantum Dots (GQDs) have emerged as one of the unique materials in fluorescence sensing of heavy metal ions due to their unique properties such as tunable bandgap, high solubility, large surface area, and absorptivity. In this work, novel amine-functionalized Graphene Quantum Dots (FGQDs) and nitrogen-doped Graphene Quantum Dots (DGQDs) were developed via a bottom-up chemical synthesis procedure. FGQDs and DGQDs were synthesized using citric acid as the carbon precursor and 3-aminobenzylamine as the surface modifier and dopant material. FGQDs and DGQDs were studied using different characterization techniques, including PL, FTIR, XPS, XRD, and TEM, to determine the fluorescence quenching of GQDs-based materials in the presence of heavy metal ions. The prepared nanostructures showed a uniform size of 5-6 nm, and a high content of amine groups and nitrogen doping. The FGQDs and DGQDs illustrate a quantum yield of 13.78% and 14.01%, respectively. The FGQDs showed an effective fluorescence quenching towards Fe³⁺ ions with a detection limit of 2.43 ppm with high selectivity and sensitivity among other heavy metal ions. On the other hand, the DGQDs samples showed effective fluorescence quenching towards Hg²⁺ ions with a detection limit of 1.99 ppm.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/79106
note: i Synthesis of Amine-functionalized and Nitrogen-doped Graphene Quantum Dots and Their Applications in Heavy Metal Ions Sensing by Sara Dordanihaghighi B.Sc. in Materials Science and Engineering, Sharif University of Technology, 2018 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) July 2021 © Sara Dordanihaghighi, 2021 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, the dissertation entitled: Synthesis of Amine-functionalized and Nitrogen-doped Graphene Quantum Dots and Their Applications in Heavy Metal Ions Sensing submitted by Sara Dordanihaghighi in partial fulfillment of the requirements for the degree of Master of Applied Science in Mechanical Engineering Examining Committee: Dr. Mohammad Arjmand (School of Engineering) Supervisor Dr. Sepideh Pakpour (School of Engineering) Supervisory Committee Member Dr. Alexander Uhl (School of Engineering) Supervisory Committee Member Dr. Feng Jiang (Faculty of Forestry) University Examiner iii Abstract Rapid growth in industry and the improper disposal of pollutants have led to the contamination of the environment and humans’ food chains by heavy metal ions. The accumulation of heavy metal ions in living organisms results in lethal diseases such as cardiovascular diseases, heart failure, and cancer. Therefore, sensing and eliminating heavy metal ions have attracted researchers’ attention in recent years. Graphene Quantum Dots (GQDs) have emerged as one of the unique materials in fluorescence sensing of heavy metal ions due to their unique properties such as tunable bandgap, high solubility, large surface area, and absorptivity. In this work, novel amine-functionalized Graphene Quantum Dots (FGQDs) and nitrogen-doped Graphene Quantum Dots (DGQDs) were developed via a bottom-up chemical syn…
has type: Thesis/Dissertation
date issued: 2021-09
is shown at: 10.14288/1.0400892
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Arjmand, Mohammad
type: Text
identifier URI: http://hdl.handle.net/2429/79106