Humidity-sensing properties of ZnCr2O4–ZnO composites

Morphology, Structure and Nonstoichiometry of ZnCr2O4 Nanophased Powder

“…Predicted morphology of spinel crystals according to model [6] using: a) unrelaxed and b) relaxed attachment energies; c) unrelaxed and d) relaxed surface energies. Typical particle morphology of powders charge 1 and charge 2 after additional heat treatment…”

“…The structure of spinel oxide is responsible for a variety of interesting properties [2][3][4][5][6]. Determination of cation distribution is of considerable relevance because the theoretical interpretation of the chemical and physical properties of these compounds depends on this distribution [5].…”

“…It was expected that a well-defined microstructure should be formed in order to improve the humidity sensitive properties [2,[6][7][8].…”

The Fabrication of Porous Barium Titanate Ceramics via Pore-Forming Agents (PFAs) for Thermistor and Sensor Applications

“…Numerous materials have been utilized for humidity sensing, of which the metal oxides that are physically and chemically stable have been extensively investigated at both room and elevated temperatures. Sensors based on changes in resistance and capacitance, as shown in Fig.4.1, are preferred owing to their compact size, which could facilitate miniaturization required for electronic circuitry (Pokhrel et al, 2003 They are nowadays widely used in the detection of gases. Semiconductor oxide gas sensors are extensively studied in order to improve their sensing characteristics, i.e., sensitivity, selectivity, stability, and response rate, to various kinds of gases and to meet the increasing needs of sensors in complicated systems and under strict conditions.…”

Effect of the Fuels Glycine, Urea and Citric Acid on Synthesis of the Ceramic Pigment ZnCr2O4 by Solution Combustion

“…Several authors have studied the synthesis of nanocrystalline double oxides with a spinel type cubic structure (AB 2 O 4 ) due to the unique potential applications, such as: magnetic materials, catalysis, cathode materials, gas sensitive materials and heat resistant pigments 4 . One of the most important spinels in ceramic industry is ZnCr 2 O 4 , which is also commonly used as magnetic material 5 , as humidity sensor 6 and catalytic material 7 , and it is synthesized by conventional solid state reaction and requires several heating and grindings steps to ensure homogeneous mixing of various oxides 8 . Therefore, it is important to develop new cost-effective methods to prepare ZnCr 2 O 4 .…”