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Metallic Phase Transition Metal Dichalcogenide Quantum Dots as Promising Bio-Imaging Materials
| Content Provider | MDPI |
|---|---|
| Author | Park, Kwang Hyun Yang, Jun Yong Jung, Sung Gyeong Ko, Byoung Min Song, Gian Hong, Soon-Jik Kim, Nam Chul Lee, Dongju Song, Sung Ho |
| Copyright Year | 2022 |
| Description | Transition metal dichalcogenide-based quantum dots are promising materials for applications in diverse fields, such as sensors, electronics, catalysis, and biomedicine, because of their outstanding physicochemical properties. In this study, we propose bio-imaging characteristics through utilizing water-soluble $MoS_{2}$ quantum dots $(MoS_{2}$-QDs) with two different sizes (i.e., ~5 and ~10 nm). The structural and optical properties of the fabricated metallic phase $MoS_{2}$-QDs $(m-MoS_{2}$-QDs) were characterized by transmission electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, UV–vis absorption spectroscopy, and photoluminescence. The synthesized $m-MoS_{2}$-QDs showed clear photophysical characteristic peaks derived from the quantum confinement effect and defect sites, such as oxygen functional groups. When the diameter of the synthesized $m-MoS_{2}$-QD was decreased, the emission peak was blue-shifted from 436 to 486 nm under excitation by a He-Cd laser (325 nm). Density functional theory calculations confirmed that the size decrease of $m-MoS_{2}$-QDs led to an increase in the bandgap because of quantum confinement effects. In addition, when incorporated into the bio-imaging of HeLa cells, $m-MoS_{2}$-QDs were quite biocompatible with bright luminescence and exhibited low toxicity. Our results are commercially applicable for achieving high-performance bio-imaging probes. |
| Starting Page | 1645 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12101645 |
| Journal | Nanomaterials |
| Issue Number | 10 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-11 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Analytical Chemistry Quantum Dots Transition Metal Dichalcogenide Bio-imaging Density Functional Theory Quantum Confinement |
| Content Type | Text |
| Resource Type | Article |
