Perylenediimide (PDI) dyes - acceptors of well-known organic semiconductor systems . 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  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).
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.
|Publication||IOP Conference Series: Earth and Environmental Science|
|Affiliation of speaker||Surgut State University|
|Position of speaker||Director, Institute of Natural and Technical Sciences|