2H-WS2 Quantum Dots Produced by Modulating the Dimension and Phase of 1T-Nanosheets for Antibody-Free Optical Sensing of Neurotransmitters
| Autor: | Man-Jin Kim, Tae Woog Kang, Su-Ji Jeon, Jong-Min Ju, Hye-In Kim, Jung Hyun Park, Jong-Ho Kim, DaBin Yim |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Phase transition
Materials science Dimethyl sulfoxide Radical Quantum yield Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Solvent chemistry.chemical_compound chemistry Transition metal Quantum dot Phase (matter) General Materials Science 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 9:12316-12323 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Modulating the dimensions and phases of transition metal dichalcogenides is of great interest to enhance their intrinsic properties or to create new physicochemical properties. Herein, we report an effective approach to synthesize 2H-WS2 quantum dots (QDs) via the dimension and phase engineering of 1T-WS2 nanosheets. The solvothermal reaction of chemically exfoliated 1T-WS2 nanosheets in N-methyl-2-pyrrolidone (NMP) under an N2 atmosphere induced their chopping and phase transition at lower temperature to produce 2H-WS2 QDs with a high quantum yield (5.5 ± 0.3%). Interestingly, this chopping and phase transition process showed strong dependency on solvent; WS2 QDs were not produced in other solvents such as 1,4-dioxane and dimethyl sulfoxide. Mechanistic investigations suggested that NMP radicals played a crucial role in the effective production of 2H-WS2 QDs from 1T-WS2 nanosheets. WS2 QDs were successfully applied for the selective, sensitive, and rapid detection of dopamine in human serum (4 min, as lo... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|