Devi, Sarita and Kaur, Rajwinder and Paul, A. K. and Tyagi, Sachin (2018) MPA-capped CdSe QD/mercaptoethylamine-capped AuNP nanocomposite-based sensor for instant detection of trinitrotoluene. Colloid and Polymer Science, 296 (3). pp. 427-440. ISSN Print 0303-402X Online 1435-1536
Full text not available from this repository.Abstract
CdSe quantum dots capped with mercaptopropionic acid (CdSe@MPA QDs) were synthesized by chemical route method. The developed CdSe@MPA QDs were pH optimized for higher emission. Gold nanoparticles in aqueous dispersion medium were synthesized by using sodium citrate as reduction agent and capped with mercaptoethylamine (MEA). Further, AuNP-MEA nanoparticles were conjugated with CdSe@MPAQDs. The “as-synthesized” nanomaterials and their composites were characterized by different analytical techniques like TEM, DLS, FTIR, UV-Vis, and PL spectroscopy. Upon excitation at λex = 400 nm, CdSe@MPA QDs show emission at 540 nm (λem) leading in a good spectral overlap with absorption spectra of AuNPs (λmax = 521 nm). Trinitrotoluene (TNT), being an electron deficient species can easily bind with electron-rich amine group. The amine functionalized GNPs (AuNP@MEA) were used as quenchers for FRET between QDs and GNPs to detect TNT. Using this assay, TNT has been selectively detected up to 21.9 nmol L−1 (LOD). Schematic diagram showing TNT detection based on FRET between gold nanoparticles and quantum dots is also suggested.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Trinitrotoluene; Quantum dots; Gold nanoparticles; Sensing FRET |
| Subjects: | CSIO > Nano Science and Nano Technology |
| Divisions: | Nano Science and Nano Technology |
| Depositing User: | Ms T Kaur |
| Date Deposited: | 28 Feb 2019 15:48 |
| Last Modified: | 28 Feb 2019 15:48 |
| URI: | http://csioir.csio.res.in/id/eprint/773 |
Actions (login required)
 |
View Item |
