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Morphology‐Driven Sensitivity Enhancement of MEH‐PPV Langmuir‐Blodgett Films on Plastic Substrates for NO 2 Gas
Author(s) -
Saxena Vibha,
Chandran Sridevi,
Choudhury Sipra,
Singh Ajay,
Ganapathi Kailasa,
Kaur Manmeet,
Muthe Kunal P.,
Gadkari Sanjay C.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702354
Subject(s) - langmuir–blodgett film , materials science , brewster's angle , annealing (glass) , morphology (biology) , chemical engineering , surface pressure , spectroscopy , analytical chemistry (journal) , nanotechnology , chemistry , composite material , optics , organic chemistry , monolayer , physics , genetics , engineering , brewster , quantum mechanics , biology , mechanics
3D ordered Langmuir–Blodgett (LB) films of poly[2‐methoxy‐5‐ (2‐ethylhexyloxy)‐1, 4‐phenylenevinylene] (MEH‐PPV) were prepared via thermal annealing. Surface properties of MEH‐PPV prepared by using different solvents, through both LB and Spin Casting techniques, were examined at the air‐water interface by measuring surface pressure‐area isotherms and Brewster Angle Microscopy. Dramatically different surface morphologies were obtained for spin cast and LB films, both prepared by using different solvents. The annealed LB films showed enhanced NO 2 gas sensing as compared to spin cast films. Spectroscopy and morphological analyses reveal that enhanced response of LB films toward NO 2 gas is due to their 3D ordered morphology, preferred molecular orientation for in‐plane transport as well as higher surface area.