Speaker
Description
Perylenediimide (PDI) dyes - acceptors of well-known organic semiconductor systems [1]. They are often used in organic photovoltaic cells in which low values of the band gap are achieved, but PDI have a tendency to self-aggregate.
The method of surface molecular imprinting [2] to create films on the surface of TiO2 nanoparticles with 1-H-pyrrol-N, N′-bis (3-pentyl) perylene-3,4,9,10-bis (dicarboximide)-5-hexyl-11-1H-1,2,3-triazol-1-yl-pentanoic acid (PDI-Taz-C5OOH) and N, N'-bis (3-pentyl) perylene-3,4,9,10-bis(dicarboximide) (EP-PDI) imprints with acceptor properties was used. Molecular imprinted (MIP) composites were obtained by sol-gel method using titanium(IV) butoxide as a precursor with precursor : template ratio 1:81. For composite characterization laser diffraction, Fourier transform infra red spectroscopy, differential scanning calorimetry and thermogravimetry analysis were carried out. For example, the average particle diameter of the EPI-PDI composite was from 3 to 9 μm. In the IR spectra aliphatic and aromatic C-H stretches, as well as C=O and C=C stretching bands were observed. Differential thermal analysis was performed in an oxidizing environment (air). An exothermic maximum was observed at 460°C, which can be explained by the dye oxidative destruction. The band gap determined by the diffuse reflectance spectroscopy is most efficiently reduced by 0.1–0.5 eV for PDI-Taz-C5OOH-imprinted composites. This defines the bathochromic shift of absorption to the visible region by 72 nm. The sorption capacity after template removal with ethanol has reached 0.75 µmol/g PDI-Taz-C5OOH, and after calcination at 400°C - 1.8 μmol/g EP-PDI. At the same time, molecular imprinted (MIP) material can rebind 2 times more PDI-Taz-C5OOH than unimprinted (NIP).
References
1. Zhan C., Yao, J. Chem. Mater., 2016, 28, 1948.
2. Huang Z., Zhang Z., Xia Q., et al. J. Appl. Polym. Sci., 2017, 134, 44888.
| Affiliation of speaker | Surgut State University |
|---|---|
| Publication | IOP Conference Series: Earth and Environmental Science |
| Position of speaker | Director, Institute of Natural and Technical Sciences |
