Solution-Processed Free-Standing Ultrathin Two-Dimensional PbS Nanocrystals with Efficient and Highly Stable Dielectric Properties
| Autor: | Amit Dalui, Somnath Pal, Ali Hossain Khan, D. D. Sarma, Jayita Pradhan, Somobrata Acharya |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Annealing (metallurgy) business.industry General Chemical Engineering Nanotechnology 02 engineering and technology General Chemistry Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Planar Nanocrystal Materials Chemistry Microelectronics Nanometre Dielectric loss 0210 nano-technology business High-κ dielectric |
| Zdroj: | Chemistry of Materials. 29:1175-1182 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Two-dimensional (2D) materials with downscaled thicknesses are the quest of the electronics industry because of their immense potential in modern microelectronics. Despite the discovery of several novel 2D materials, the flexible design of high-performance free-standing ultrathin 2D dielectric nanocrystals (NCs) with a large planar morphology remains the most challenging task. We develop a method for synthesizing high-quality free-standing ultrathin 2D NCs of PbS with a well-defined large rectangular morphology with a thickness of ∼2 nm. The lateral size can be tuned up to a few hundred nanometers by changing only the reaction annealing time. Microscopic and spectroscopic analyses at different stages of the reaction reveal formation of 2D NCs by a continuous growth mechanism. The 2D NCs exhibit a nearly temperature and frequency independent high dielectric constant (>13.4) with a small dielectric loss (0.0006 at 20 K and |
| Databáze: | OpenAIRE |
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