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SnO 2 Tailored by CuO for Improved CH 4 Sensing at Low Temperature
Author(s) -
Das Arindam,
Panda Dipankar
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800296
Subject(s) - materials science , raman spectroscopy , composite number , annealing (glass) , analytical chemistry (journal) , transmission electron microscopy , scanning electron microscope , diffraction , nanotechnology , chemistry , composite material , optics , physics , chromatography
Trace level methane (CH 4 ) detection is demonstrated at low temperature. Functional metal oxide of SnO 2 tailored by CuO is prepared via a co‐precipitation chemical route followed by annealing in air. Raman spectroscopy confirms presence of A g mode of CuO at 290 cm −1 along with A 1g mode of SnO 2 at 630 cm −1 . Results from the X‐ray diffraction and transmission electron microscope indicate that both crystalline SnO 2 and CuO are present in the composite. Particle size of SnO 2 is found to be larger in the composite than the pristine‐annealed SnO 2 of 25 nm at 800 °C. However, sensor studies with CH 4 reveal stronger response and low operational temperature of 100 °C for the composite in comparison to the pristine‐annealed SnO 2 which shows poor response (<1%) even at higher temperature of 150 °C. Current–voltage measurements support the formation of local p–n junctions in the CuO–SnO 2 composite. The role of n–p junction in the composite is elaborated and correlated to the improved response.