Photocatalytic and Gas Sensitive Multiwalled Carbon Nanotube/TiO-ZnO and ZnO-TiO Composites Prepared by Atomic Layer Deposition.

TiO and ZnO single and multilayers were deposited on hydroxyl functionalized multi-walled carbon nanotubes using atomic layer deposition. The bare carbon nanotubes and the resulting heterostructures were characterized by TG/DTA, Raman, XRD, SEM-EDX, XPS, TEM-EELS-SAED and low temperature nitrogen adsorption techniques, and their photocatalytic and gas sensing activities were also studied. The carbon nanotubes (CNTs) were uniformly covered with anatase TiO and wurtzite ZnO layers and with their combinations.