Hematite
α-Fe2O3 pseudocubes, rhombohedra,
and spindlelike particles were prepared via a low cost and environmentally
friendly microwave route. The structure and morphology were characterized
by scanning electron microscopy (SEM) and transmission electron microscopy
(TEM). Possible formation mechanisms of the particles are discussed.
The design of the sensor includes a conductor-backed coplanar waveguide
(CBCPW) on which a hematite sensitive layer is deposited. Hematite
deposition was realized by doctor-blade on areas identified as the
most responsive by near-field microwave microscopy (NFMM). A comparative
microwave gas sensing study was conducted to evaluate the gas response
of these morphologies upon ammonia exposure at room temperature. This
paper represents a first look at the shape effect involved in microwave
transduction, as each morphology presented a significant different
behavior upon ammonia adsorption.
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