Conduction mechanisms in SnO2 single-nanowire gas sensors: An impedance spectroscopy study

A Gas Sensor Based on a Single SnO Micro-Disk

“…This divergence can be attributed to the sensing mechanism of individual structures, which should be understood by examining the ratio between the material thickness and the Debye length, which is directly related to the amount of exchanged charges [ 40 ]. So, even considering that the total of adsorbed analyte species is larger for Device 2 due to the greater number of free tin ions with exposed lone pairs available to overlap with the NO 2 molecules, both devices are only partially depleted due to the so-called Weisz limitation where the band bending is limited to about 1 eV as a way to prevent the double-layer potential (number of charged species limited to 10 −5 to 10 −3 monolayers) [ 41 , 42 ], causing thickness to play a major role.…”

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature

“…32 In addition, the interlayer of multilayer expanded graphite could accommodate large volume changes of nanowires, avoiding collapse or deformation during repeated adsorption and desorption. 33 HRTEM images of EG/ NA3 displayed in Fig. 2d-f indicate that the nanowires were formed by nano-sized crystals and the lattice spacings 0.751 and 0.252 nm correspond to the (003) and (012) planes of the NiAl-LDH nanocrystal, respectively; 0.21 nm corresponds to the (002) plane of EG.…”

Growth mechanism of SnC2H4O2 nanowires prepared by the polyol process as SnO2 precursor nanowires

“…SnO 2 nanowires have been synthesized mainly through a vapor-solid or vapor-liquid-solid process. 18,[20][21][22][23] The disadvantages of these methods are the high temperatures required for synthesis, costly scale-up, and difficulty in synthesizing a reproducible and uniform nanowire. In recent years, the socalled polyol process, which involves the use of ethylene glycol (EG), has been proposed to overcome these disadvantages.…”