Tuning optical properties of printable carbon quantum dots using near-field environment
| Autor: | Apurba L. Koner, Joghee Ravichandran, Kaushik Pal, Sanjeev K. Jat, Lopamudra Bhattacharjee, Rama Ranjan Bhattacharjee |
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| Rok vydání: | 2017 |
| Předmět: |
Electron mobility
Materials science Inkwell business.industry Near and far field 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polyvinyl alcohol 0104 chemical sciences chemistry.chemical_compound chemistry Carbon quantum dots Screen printing Optoelectronics General Materials Science Emission spectrum 0210 nano-technology business Excitation |
| Zdroj: | Carbon. 125:409-418 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2017.09.030 |
| Popis: | Tuning emission properties of carbon quantum dots (CQDs) is a challenge as limited domain size of sp2 islands in the CQDs restricts electron mobility in one dimension. The result is the formation of often blue and green light-emitting CQDs. The present manuscript depicts the transformation of CQDs into printable ink material and its utilization in fabricating films with tunable emission properties. Excitation and emission spectra of the CQDs were studied in powder form, aqueous suspension, freely suspended polyvinyl alcohol (PVA) film, printed impressions (PIs) and as thin-films respectively. Analysis of spectroscopic and microscopic data showed a substantial near-field effect in powder, CQD-embedded PVA (PVA-CQD) films and PIs. Light-responsive current-voltage characteristics in PVA-CQD films were explained in the light of interparticle-interaction induced near-field effect. |
| Databáze: | OpenAIRE |
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