123rd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists I
Room No. Room 202
Time THU 10:04-10:08
Code ANAL1.O-17
Subject Picogram detection of nitro-explosive compound using multiple emitting Polythiophenes-Coated CdTe QDs
Authors Mohamed Ragab Elsayed Ali, Salah Mahmoud Tawfik Ahmed1, Yong-ill Lee1,*
Changwon National University, Egypt
1Department of Chemistry, Changwon National University, Korea
Abstract A facile in-situ polymerization strategy has been performed to synthesize novel multiple emitting amphiphilic conjugated polythiophene-coated CdTe quantum dots as an optical sensor for the rapid, sensitive, selective, and on-site detection of 2,4,6-trinitrophenol (TNP). More importantly, portable, disposable, cost-effective, and easy-to-use paper strips and chitosan film were successfully applied to visually detect TNP concentrations as low as 1 nM. Using a smartphone with an easy-to-access and color-scanning App as a detection platform for the quantitative determination of TNP has also been demonstrated. The quantum dot-based sensor not only exhibits an excellent selectivity for TNP comparing with its analogues, but also possesses an excellent limit of detection of 0.56 nmol L-1 with linear ranges of 0.05-14 μmol L-1. Furthermore, the quantum dot sensor was successfully applied to determine TNP in tap and river water samples, presenting high recoveries in the range of 95.5–106.3% and 96.9-110.88% at three spiking levels with the relative standard deviation within 1.54-2.32% and 1.44-2.81%, respectively. This work unveiled an effective method for the sensitive and selective detection of TNP explosive toward national security and environmental protection. Keywords: QDs, trinitrophenol (TNP), river water, electron transfer mechanism.
E-mail m.elmasry.chem2014@gmail.com