Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/68393
Title: Visual sensor application of a graphene quantum dot-semiconductor quantum dot nanohybrid based on ratiometric fluorescence
Authors: Teo, Jescinda Li Jing
Keywords: DRNTU::Engineering::Nanotechnology
Issue Date: 2016
Abstract: A novel ratiometric fluorescence probe consisting of CdTe quantum dots (QDs) and amine functionalized graphene quantum dots (GQDs) is designed for the detection of Fe(II) ions. Amine-GQDs were prepared with pyrene as a precursor while CdTe QDs were prepared with tellurium powder and cadmium chloride dihydrate. The characterization of both QDs prepared were discussed in the report. An optimised concentration of GQDs and CdTe QDs was used in the preparation of the ratiometric fluorescence probe to obtain an appropriate fluorescence intensity ratio and observable fluorescence colorimetric change. It was found that the ratiometric fluorescent probe has a sensitivity of 0.2μM for ferrous ions. The selectivity of the ratiometric fluorescent probe was also studied against other transition metal that are commonly biologically found.
URI: http://hdl.handle.net/10356/68393
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Student Reports (FYP/IA/PA/PI)

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