ABSTRACT: ZnO microcrystals are synthesized through a facile solution method and characterized by field-emission scanning electron microscopy,
transmission electron microscopy, selected area electron diffraction and X-ray diffraction. The ethanol sensing properties
of these microcrystals are investigated by spin-coating them on a silicon substrate with Pt electrodes to fabricate a micro-structure
sensor. The sensitivity is up to 8 when the sensor is exposed to 50 ppm ethanol, and the response time and recovery time are
10 s and 20 s, respectively. A contact-controlled model is established to explain the sensing properties of the microcrystals,
which provides another approach to realize high-performance gas sensors.
Chinese Science Bulletin 04/2012; 54(23):4371-4375. · 1.32 Impact Factor