High-efficiency grafting of halloysite nanotubes by using p-conjugated polyfluorenes via 'click'' chemistry

摘要

New hybrid halloysite nanotubes (HNTs) were obtained by grafting conjugated polyfluorenes (PFs) onto the surface via "click'' chemistry. The hybrid material can be dispersed in organic solvent such as dichloromethane, and exhibits intense blue emission peaked at 448 nm. The absorption and emission spectra of the HNTs show distinct bathochromic shifts compared to PFs, which can be attributed to the extended pi-conjugation as a result of the cycloaddition of azide and alkyne groups. The changes of the spectra also show that the PFs were grafted onto the HNTs through chemical bonds. Thermal gravimetric analyzer data show one more significant result, the grafting degree of the HNTs is 150 %, which means that a high mass ratio of PF polymers was grafted onto the HNTs. Furthermore, characterizations by infrared, nuclear magnetic resonance, and X-ray photoelectron spectroscopy also support the conclusion. The combination of HNTs with conjugated polymers will lead to a new generation of donor-acceptor nanohybrid materials which are promising in application in photoelectric fields.