UV activated hollow ZnO microspheres for selective ethanol sensors at low temperatures

UV Light Activated SnO2/ZnO Nanofibers for Gas Sensing at Room Temperature

“…Recently, an alternative method utilizing the light energy to activate the sensing process of the SMO based gas sensors have been reported extensively (Camagni et al, 1996;Fan et al, 2009;Prades et al, 2009;Lu et al, 2012;Wu et al, 2012;Liu et al, 2013;Park et al, 2013;Zhang et al, 2014;Li et al, 2015Li et al, , 2017Chen et al, 2016;Saboor et al, 2016;Gu et al, 2017a). Adopting the light with a wavelength at or close to the corresponding optical forbidden bandgap of the SMO, the sensing properties of SMO based sensors can be significantly enhanced at much lower operating temperature or even room temperature (Camagni et al, 1996;Fan et al, 2009;Prades et al, 2009;Lu et al, 2012;Wu et al, 2012;Liu et al, 2013;Park et al, 2013;Zhang et al, 2014;Li et al, 2015Li et al, , 2017Chen et al, 2016;Saboor et al, 2016;Gu et al, 2017a). The photogenerated electrons or holes can facilitate the chemical redox reactions between pre-adsorbed ionized oxygens and the targeted gas molecules thus inducing a sensor signal even at room temperature.…”

“…Zhang made TiO 2 nanoparticles based chemiresistive gas sensor with the light illumination and working in the condition of 60 o C (Zhang et al, 2014). However, by using the hollow structured TiO 2 nanotubes or microspheres, the selectivity and response speeds are improved significantly (Wu et al, 2012;Liu et al, 2013;Li et al, 2015;Chen et al, 2016). Chen et al (2016) made a hollow ZnO based gas sensor and found a very promising to be used for a selective ethanol sensor working at 80 • C with the UV activation.…”

“…However, by using the hollow structured TiO 2 nanotubes or microspheres, the selectivity and response speeds are improved significantly (Wu et al, 2012;Liu et al, 2013;Li et al, 2015;Chen et al, 2016). Chen et al (2016) made a hollow ZnO based gas sensor and found a very promising to be used for a selective ethanol sensor working at 80 • C with the UV activation. One more benefit of using light activation instead of DC-powered heaters may be that the light can be easily driven up by the randommechanic vibration energy harvested by using triboelectric nanogenerators as demonstrated recently (Gu et al, 2017a).…”

Analysis of methyldopa in the presence of phenylephrine using electrocatalytic effect of a ferrocene derivative at a surface of feather like La3+/ZnO nano‐flowers modified carbon paste electrode

“…It can be widely applied due to its unique properties, including broad band gap of 3.37 eV, large exciton binding energy of 60 meV at ambient temperature, larger than some main semiconductors (GaN and ZnSe), thermal and mechanical stabilities, piezoelectric and pyroelectric features, electrochemical and optoelectronic nature and biocompatibility. Accordingly, there are multiple available approaches to produce variable ZnO nanomaterials like nanorods, nanowires, nanobelts, nanoflowers, nanodisks, nanosheets, nanospirals and nanotubes …”

Increased sensitivity of Au-Pd nanolayer on tapered optical fiber sensor for detecting aqueous Ethanol

“…Optical fiber sensors earn this accolade due to their many advantages such as miniaturization, flexibility, fast response and capability for real time and in-situ sensing deployment as well as capability of remote sensing [3,4]. This increases the desirability of optical fiber sensors as compared to electrical based transducers [5,6], especially when it comes to chemical detection [7,8], humidity [9,10], and also vibration sensing [11,12].…”