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Clustered Detection of Eleven Phthalic Acid Esters by Fluorescence of Graphene Quantum Dots Displaced from Gold Nanoparticles

Authors
Lim, H.J.Jin, H.Chua, B.Son, A.
Issue Date
26-1월-2022
Publisher
American Chemical Society
Keywords
aptasensor; clustered detection; gold nanoparticles; graphene quantum dots; phthalic acid esters (PAEs)
Citation
ACS Applied Materials and Interfaces, v.14, no.3, pp.4186 - 4196
Indexed
SCIE
SCOPUS
Journal Title
ACS Applied Materials and Interfaces
Volume
14
Number
3
Start Page
4186
End Page
4196
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136599
DOI
10.1021/acsami.1c21756
ISSN
1944-8244
Abstract
A gold nanoparticle-quenched graphene quantum dot-based aptasensor was developed to perform clustered detection of 11 phthalic acid esters (PAEs). The binding of the target PAEs to the aptasensor frees the graphene quantum dots that are otherwise quenched by the carrier gold nanoparticle. The resultant fluorescence upon excitation is proportional to the number of freed graphene quantum dots and hence the target PAE concentration. The synthesis of the proposed aptasensor was first verified step-by-step via FT-IR measurement, scanning electron microscopy, and fluorescence measurement. Selectivity was evaluated for individual and combined target PAEs and compared against seven non-PAE endocrine disrupting compounds. The proposed aptasensor successfully quantified 11 PAEs in test samples with varying concentrations of 0.001–50 ng PAEs/mL and demonstrated a limit of detection of ∼4 pg./mL. Finally, the AuNP-gQD aptasensor was employed to detect multiple combinations of commonly regulated PAEs (DBP, DIBP, DEHP, and BBP). The recovery (%) for all four PAEs combination in environmentally relevant concentrations of 0.5, 1, 5, and 10 ng/mL were ∼100%. © 2022 American Chemical Society
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공과대학 (전기전자공학부)
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