Humidity sensing and dielectric properties of mesoporous Bi3.25La0.75Ti3O12 nanorods

Enhanced Humidity Sensing Performance of the La2Ti2O7/La(OH)3 Nanocomposite

“…Relative humidity (RH) is an important environmental factor that plays a significant role in various areas closely related to our daily life, such as industrial processing, agricultural production, weather forecast, and medical and other aspects. − Many kinds of materials including polymers, metal oxides, carbon nanotubes, and composites have been explored to be used as humidity sensing materials, and many kinds of humidity sensors have been developed. − Currently, the capacitance-, impedance-, and resistance-type sensors are widely used and are the most convenient humidity sensors, in which the electronic parameters of capacitance, impedance, and resistance, respectively, were used to characterize the humidity sensing characteristics. − In order to meet the requirements of various applications, a high-performance humidity sensor should feature the merits of high sensitivity, fast response/recovery speed, small hysteresis, excellent repeatability, and good linear response. − Achievement of these merits not only depends on the sensing materials tested but also on their microstructure. Therefore, researchers in recent years have made many efforts to explore new sensing materials and to enhance humidity properties via fabricating various nanostructures , and compositing with, for example, low-dimensional materials. , …”

“…La-based, even La-doped, complex metal oxides, such as LnFeO 3 (Ln = Sm, Nd, and La), La 0.7 Sr 0.3 MnO 3 , Bi 3.25 Ln 0.75 Ti 3 O 12 (Ln = La, Ce, Nd, and Sm), ,− La 0.93 K 0.07 Co 0.3 Fe 0.7 O 3−δ , and LaFeO 3 , , have been evidenced to exhibit excellent humidity sensing performance. La 2 Ti 2 O 7 , a metal oxide containing La, has been widely studied and applied in many fields, such as photocatalytic hydrogen production and photocatalytic degradation, because of its high photocatalytic activity and good chemical properties.…”

“…14−17 Achievement of these merits not only depends on the sensing materials tested but also on their microstructure. Therefore, researchers in recent years have made many efforts to explore new sensing materials and to enhance humidity properties via fabricating various nanostructures 18,19 and compositing with, for example, low-dimensional materials. 20,21 La-based, even La-doped, complex metal oxides, such as LnFeO 3 (Ln = Sm, Nd, and La), 17 La 0.7 Sr 0.3 MnO 3 , 1 Bi 3.25 Ln 0.75 Ti 3 O 12 (Ln = La, Ce, Nd, and Sm), 19,22−24 La 0.93 K 0.07 Co 0.3 Fe 0.7 O 3−δ , 25 and LaFeO 3 , 26,27 have been evidenced to exhibit excellent humidity sensing performance.…”