Abstract Ta4N5 is N-rich thermodynamically stable phase however Ta4N5 did not obtain much attention comparing with Ta3N5 especially using sputtering From our research the band gap of Ta4N5 is approximate 2 5 eV that can effectively utilize the visible light up to 500 nm which is promising for photocatalysis In this research reactive sputtering was used to directly grow Ta4N5 nanorod arrays on a FTO substrate for the photo-related applications Well separated and polycrystalline Ta4N5 nanorod arrays were obtained by tuning the parameters of the Ar/N2 ratio the working distances between the gun and the substrate the sputtering pressures and the DC power Various characterization tools such as XRD SEM TEM and UV-VIS were used to study the properties The photodegradation performance was studied Both in-situ 600 ?C and 550 ?C samples showed a considerable improvement under the environment at pH = 10 approximately 2 times faster than that measured at pH = 7 The photoelectrochemical current for the in-situ 600 ?C samples was measured approximate 4 ?A/cm2 under visible light illumination at the constant bias supply at 0 5 V The IPCE of the in-situ 600?C sample was found approximately 3% and the IPCE variation trend as a function of wavelength was found in a good agreement with the UV-VIS absorption spectrum Ta4N5 nanorods showed excellent stability after a cycling test consisting of three runs and seven cycles for each run The future works for this research include pursuing the followings: much better separation of Ta4N5 nanorods with excellent crystallinity Ta3N5 nanorod structures various cation dopings and water splitting to obtain H2 fuels
Facile Fabrication of Ta4N5 Nanorod Arrays Using Sputtering and Their Photo-related Activities
翊嘉, 彭. (Author). 2014 八月 6
學生論文: Master's Thesis