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Zinc Oxide on Oxygenated Aligned Multiwalled Carbon Nanotubes for Photodetector Applications
Keywords: CNTs, ZnO, Photodetetor
Carbon Nanotubes (CNTs) are grapheme sheets rolled into a seamless cylinder and sp2 hybridized networks with high electronic stability and high mechanical strength in one dimension conductor.1 According to recent study, tubes can be coated with metal oxides (such as TiO2, SnO2, and V2O5, etc..) and the resultant composites display interesting effects in photocatalyst, lithium battery, and gas sensor applications. For example, Fe2O3- and TiO2- coated tubes display enhanced coercivity and photo-catalysis at visible regime.2,3 The surface energy of CNTs is mainly governed by dispersive forces and oxide deposition requires defects creation to interact with the cations and oxygen. Here, through precursor injection method of atomic layer deposition (ALD), inorganic ZnO compound can be epitaxially grown on CNTs scaffolds. From the Xray Diffraction Pattern (XRD), we found that ZnCO3 formation between CNTs and ZnO. With the use of an interstitial state of wurtzite structure, proves to be an extended lattice distance and to yield a shortened doping state of phonons. Since from the Photoluminescence profile, oxide coats remain optically active at ultraviolet wavelength. We investigate the applications of these nanocomposites in UV (325nm) and green laser (532 nm) photodetectors from room temperature to 77K. We use the pure CNTs as a reference, the results display that the photocurrent have a better behavior in green laser wavelength (lower energy). Besides, pure CNTs have a better photocurrent behavior than CNT-ZnO.
Chia-I, Hung,
National Tsing Hua University
Hsinchu City, Taiwan
Taiwan (R.O.C.)

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