[6p-S44-1~21] 9.2 Nanowires and Nanoparticles

▼ [6p-S44-21] Fabrication and Characteristics of Titanium Dioxide Nanofibers/Cellulose Nanofibers Nanocomposite Film

〇(D)Tinghan Lin¹, Yuhan Liao¹, Kouping Chiang¹, Mingchung Wu¹, Yawen Cheng², Chienhui Wu², Yuchen Chen², Pomin Chen², Wantun Hung² (1.Chang Gung univ., 2.Formosa Plastics Corp.)

Keywords:cellulose nanofiber, TiO2 Nanofibers, nanocomposite film

Cellulose is the most abundunt natural polymer on earth and exists numerously in wood, crop,and cotton. Because of its intrinsic properties like bio-compatiblity, bio-degradation, chemical stablity, non-toxicity,and renewable ability, it has the pontential to be a candidate for the sustainable material in next generation. Cellulose nanofiber (CNF) extracted from cellulose fibers has been reported that it exhibits the unique optical properties, good mechanical strength, and high aspect ratio. These CNFs are uauslly isolated by chemical treatment in strong acid, enzymes reaction,or mechanical disintegration through homgenizer with high energy. TEMPO-oxidation is an effective way to separate the CNF in cellulose microfibril bundles due to the formation of the regioselective replusive force between each nanobirils by modification of C6 carboxylate. Further applying the CNF in tranparent paper to be flexible substrate has attracted lots of interests owing to the extraordinary feature of CNF transparent substrate such as high mechanical strength, low coefficient of thermal expansion, excellent optical tranmittance,and printablity. Titainium dioxide nanomaterial has worldwide studied since 1972 and attracted plenty intersts for its photocatalytic activity. One-dimensional nanomaterials such as nanofiber, nanowire, or nanorod are capable of achieving network struture easily that provides an effcient charge transport path to inhibit the recombination of electron-hole pairs. Moreover, nanofier-shaped materials can be probably combined with CNF to form the dense, flexible and freestanding composite film because of the accordance size between each other . Thus, we propose a simple way to prepare the TiO₂ NFs/CNF nanocompsite film with flexibility and photocatalytic performance. CNF is fabricated by TEMPO-oxidation method plus post-reduction by NaBH₄. On the other hand, various TiO₂ NFs are sythesized by hydrothermal treatment and followed by calcination process. To obtain well-dispersion mixture solution of TiO₂ NFs and CNF, the surface modification of TiO₂ NFs are conducted under UV-ozone treatment improving the hydrophilicity in water. The charaterizations involving morpholoy, crystal struture, thermal, optical and mechanical properties were studied. The photodegradation of pollutant was measured under simulated solar light.