Determination of electrical conductivity type of SbSI nanowires

Recent Advances in Ferroelectric Nanosensors: Toward Sensitive Detection of Gas, Mechanothermal Signals, and Radiation

“…Similar to [35], mobile protons were found to be responsible for a strong increase in electrical conductivity due to water physisorption on the grain boundaries and flat surfaces of potassium niobate [59]. Nanosensors based on KNbO 3 nanofibers exhibited [58]. An adsorption of oxygen and hydrogen resulted in an increase and decrease in electric current flowing through the SbSI nanosensor, respectively [58].…”

“…Nanosensors based on KNbO 3 nanofibers exhibited [58]. An adsorption of oxygen and hydrogen resulted in an increase and decrease in electric current flowing through the SbSI nanosensor, respectively [58]. Such behavior indicated the p-type conductivity of SbSI nanowires.…”

“…The reversible character of the response of the SbSI nanosensor to oxygen and hydrogen, realized by simple evacuation of gas from the test chamber, suggested that H 2 and O 2 molecules are physisorbed on the SbSI surface. The physisorption was dominated by van der Waals interactions and influenced by ferroelectric polarization [58]. The temperature dependences of electric current I T flowing through semiconducting SbSI nanowires in vacuum, as well as in oxygen and hydrogen atmosphere, were also measured (Figure 2(e)).…”

“…It has involved dispersion of SbSI xerogel in toluene, deposition of dispersed solution on special substrate equipped with microelectrodes, electric field-assisted alignment of nanowires, and their bonding to microelectrodes using ultrasonic nanowelding. Such prepared devices have been successfully applied for humidity sensing [35,57], as well as for detection of different gas molecules (H 2 [58], O 2 [58], and N 2 O [56], CO 2 [35]). Comparing properties of humidity sensors made of an array of a few aligned SbSI nanowires and SbSI xerogel, it was concluded in [35] that latter one exhibits longer time response and simultaneously higher sensitivity to humidity changes.…”

“…Table 1: Parameters of (1) fitted to temperature dependence of electric current flowing through SbSI nanowires (Figure 2(e)) in different gas atmospheres. Reprinted from [58]. Copyright (2016), with permission from Elsevier.…”