Abstract
In this manuscript, we report the refractive-index (RI) modulation of various concentrations of nitrogen-doped carbon dots (N@C-dots) embedded in poly(vinyl alcohol) (PVA) polymer. The dispersion and size distribution of N@C-dots embedded within PVA have been investigated using electron microscopy. The RI of PVA-N@C-dots can be enhanced by increasing the doping concentration of highly fluorescent C-dots (quantum yield 44%). This is demonstrated using ultraviolet-visible (UV-visible), photoluminscence, Raman, and Fourier transform infrared (FTIR) spectroscopy measurements. The Mie scattering of light on N@C-dots was applied for developing the relationship between RI tuning and absorption cross section of N@C-dots. The extinction cross section of N@C-dot thin films can be rapidly enhanced by either tuning the RI or increasing the concentration of N@C-dots. The developed method can be used as effective RI contrast for various applications such as holography creation and bioimaging.
| Original language | English |
|---|---|
| Pages (from-to) | 28930-28938 |
| Number of pages | 9 |
| Journal | ACS applied materials & interfaces |
| Volume | 9 |
| Issue number | 34 |
| DOIs | |
| State | Published - 30 Aug 2017 |
Bibliographical note
Publisher Copyright:© 2017 American Chemical Society.
Keywords
- C-dots
- Mie scattering
- N@C-dots
- PVA
- refractive index