Atomic layer deposition in nanometer-level replication of cellulosic substances and preparation of photocatalytic TiO2/cellulose composites.
TiO2 replicas of filter paper with nanometer-level accuracy were prepared by atomic layer deposition of thin conformal TiO2 coating, followed by a removal of the paper by air-anneal at 450 degrees C. Photocatalytic anatase TiO2/cellulose composites were also made by leaving the paper intact. The TiO2 films were deposited from Ti(OMe)4 and H2O at 150-250 degrees C. The photocatalytic activity of the TiO2/cellulose composite was verified by photocatalytic reduction of Ag(I) from an aqueous solution to Ag nanoparticles on the TiO2 surface. The TiO2/cellulose composites are mechanically more stable than the free-standing TiO2 replicas and are therefore potentially suitable as lightweight, high surface area photocatalysts.
Kemell
Marianna
M
Laboratory of Inorganic Chemistry, Department of Chemistry, FI-00014 University of Helsinki, Finland. Marianna.Kemell@Helsinki.fi
Pore
Viljami
V
Ritala
Mikko
M
Leskelä
Markku
M
Lindén
Mika
M
D000327:Adsorption; D002384:Catalysis; D002482:Cellulose / Q000138:chemical synthesis / Q000737:chemistry*; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D010777:Photochemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D008567:Membranes, Artificial; C009495:titanium dioxide; D002482:Cellulose; D014025:Titanium