NDLI: Ultrasensitive determination of 2,4,6-trinitrotoluene by exploiting the strongly enhanced electrochemiluminescence of an assembly between CdSe and graphene quantum dots and its quenching by TNT

Content Provider	Springer Nature Link
Author	Shi, Jian Jun Meng, Lei Xia Yang, Ping
Copyright Year	2016
Abstract	The authors describe an electrochemiluminescence (ECL) assay for the determination of 2,4,6-trinitrotoluene (TNT) in soil. It is based on the finding that graphene quantum dots (GQDs) strongly enhance the ECL of CdSe quantum dots (CdSe QDs), and ECL is strongly quenched by TNT. In order to assemble the GQDs and CdSe QDs, the latter were functionalized with carboxy groups and then coupled to amino-functionalized GQDs (afGQDs). The resulting CdSe-GQDs conjugation was placed as a thin film on a glassy carbon electrode (GCE). The modified electrode displays an about 8-fold enhanced ECL intensity compared to an GCE with CdSe QDs only, and the onset potential of the ECL reaction is positively shifted by 140 mV. In the presence of TNT, the ECL is quenched due to the formation of the TNT-amine complex. The decrease in ECL intensity is related to the logarithm of the TNT concentration in the range from 0.01 to 100 ppb, with a detection limit as low as 3 ppt. The results of TNT assays in (spiked) soil samples showed recoveries between 99.2 and 105.0 % and relative standard deviations between 3.0 and 8.2 %. This strategy offers a new perspective for developing ECL assays based on the use of semiconductor nanoparticles and graphene-based nanomaterials. Graphical abstract A electrochemiluminescence (ECL) assay was developed for the detection of 2,4,6-trinitrotoluene (TNT). The method utilizes a combination of CdSe and graphene quantum dots (GQDs), and a glassy carbon electrode modified with poly(diallyldimethylammonium chloride)-protected graphene. The assay is simple and displays acceptable reproducibility.
Starting Page	73
Ending Page	80
Page Count	8
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	184
Issue Number	1
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2016-10-28
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrogenerated chemiluminescence Amino-functionalized GQDs Peroxodisulfate Phosphate buffer Glassy carbon electrode Electrochemical impedance spectrosocopy HRTEM FTIR Hexacyanoferrate Nitroaromatic explosives Nanochemistry Nanotechnology Characterization and Evaluation of Materials Analytical Chemistry Microengineering
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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