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Comparative Study of Fe‐Doped ZnO Nanowire Bundle and Their Thin Film for NO 2 and CH 4 Gas Sensing
Author(s) -
Vyas Rishi,
Sharma Sarla,
Khan Shabana,
Divakar R.,
Sachdev K.,
Sharma S. K.
Publication year - 2015
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201400195
Subject(s) - materials science , wurtzite crystal structure , nanowire , thin film , doping , transmission electron microscopy , scanning electron microscope , spin coating , nanotechnology , chemical engineering , analytical chemistry (journal) , optoelectronics , composite material , zinc , metallurgy , chemistry , chromatography , engineering
Summary The free standing Fe‐doped ZnO nanowire bundle is synthesized by employing a typical vapor phase transport method in single step from Fe+Zn powder in O 2 +Ar flow. Fe‐doped ZnO nanowires are characterized by Transmission Electron Microscopy (TEM) and Energy Dispersive Spectroscopy (EDS) suggesting formation of hexagonal wurtzite phase of ZnO with 7 at% Fe in ZnO with typical nanowire diameter in the range of 20 nm–70 nm. These nanowire bundles are ultrasonicated and processed into thin film using spin coating technique. Both of the Fe‐ doped ZnO nanowire bundle and thin films are tested for their NO 2 and CH 4 (20–100 ppm) sensing properties. The thin film exhibited higher operating temperature (300°C) and response time (45 sec) as compared to nanowire bundle (150°C and 15 sec).