Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection
Herein, we report the synthesis of CdTe quantum dots prepared by colloidal synthesis route using the branched mercapto acid, 3 Mercaptoisobutyric acid (3-MIBA) as capping agent. The as synthesized 3-MIBA capped CdTe quantum dot (CdTe@3-MIBA) was used as fluorescent probe to detect Hg2+. Further, the...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-04-01
|
| Series: | Sensing and Bio-Sensing Research |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214180419300133 |
| _version_ | 1811330945160052736 |
|---|---|
| author | Yogesh S. Choudhary Gomathi Nageswaran |
| author_facet | Yogesh S. Choudhary Gomathi Nageswaran |
| author_sort | Yogesh S. Choudhary |
| collection | DOAJ |
| description | Herein, we report the synthesis of CdTe quantum dots prepared by colloidal synthesis route using the branched mercapto acid, 3 Mercaptoisobutyric acid (3-MIBA) as capping agent. The as synthesized 3-MIBA capped CdTe quantum dot (CdTe@3-MIBA) was used as fluorescent probe to detect Hg2+. Further, the performance was linear in the range 1.5–100 nM with a limit of detection of 1.5 ± 0.5 nM. The results demonstrated that fluorescence quenching of CdTe@3-MIBA by mercury follow different routes: (i) strong affinity of Hg towards S causes depassivation of capping agents thus resulting in aggregation of quantum dots (ii) excitonic electron transfer from the lowest unoccupied molecular orbital (LUMO) of CdTe@3-MIBA to the LUMO of Hg2+ thus preventing emission. Keywords: CdTe, Quantum dots, Mercury ion, Optical sensor, Fluorescence quenching |
| first_indexed | 2024-04-13T16:11:33Z |
| format | Article |
| id | doaj.art-16f86beaf135466d8144d17d9003f3b8 |
| institution | Directory Open Access Journal |
| issn | 2214-1804 |
| language | English |
| last_indexed | 2024-04-13T16:11:33Z |
| publishDate | 2019-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Sensing and Bio-Sensing Research |
| spelling | doaj.art-16f86beaf135466d8144d17d9003f3b82022-12-22T02:40:14ZengElsevierSensing and Bio-Sensing Research2214-18042019-04-0123Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detectionYogesh S. Choudhary0Gomathi Nageswaran1Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala 695547, IndiaCorresponding author.; Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala 695547, IndiaHerein, we report the synthesis of CdTe quantum dots prepared by colloidal synthesis route using the branched mercapto acid, 3 Mercaptoisobutyric acid (3-MIBA) as capping agent. The as synthesized 3-MIBA capped CdTe quantum dot (CdTe@3-MIBA) was used as fluorescent probe to detect Hg2+. Further, the performance was linear in the range 1.5–100 nM with a limit of detection of 1.5 ± 0.5 nM. The results demonstrated that fluorescence quenching of CdTe@3-MIBA by mercury follow different routes: (i) strong affinity of Hg towards S causes depassivation of capping agents thus resulting in aggregation of quantum dots (ii) excitonic electron transfer from the lowest unoccupied molecular orbital (LUMO) of CdTe@3-MIBA to the LUMO of Hg2+ thus preventing emission. Keywords: CdTe, Quantum dots, Mercury ion, Optical sensor, Fluorescence quenchinghttp://www.sciencedirect.com/science/article/pii/S2214180419300133 |
| spellingShingle | Yogesh S. Choudhary Gomathi Nageswaran Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection Sensing and Bio-Sensing Research |
| title | Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection |
| title_full | Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection |
| title_fullStr | Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection |
| title_full_unstemmed | Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection |
| title_short | Branched mercapto acid capped CdTe quantum dots as fluorescence probes for Hg2+ detection |
| title_sort | branched mercapto acid capped cdte quantum dots as fluorescence probes for hg2 detection |
| url | http://www.sciencedirect.com/science/article/pii/S2214180419300133 |
| work_keys_str_mv | AT yogeshschoudhary branchedmercaptoacidcappedcdtequantumdotsasfluorescenceprobesforhg2detection AT gomathinageswaran branchedmercaptoacidcappedcdtequantumdotsasfluorescenceprobesforhg2detection |