Własności sensorowe pojedynczych nanodrutów SbSI

Abstract

The main aim of the work was to build sensors based on single antimony sulfoiodide (SbSI) nanowires and investigate their electrical, photoelectrical, and sensor properties. Comparison of sensors constructed from single SbSI nanowires and SbSI gel was the second purpose. The first principal thesis of the work is following: ultrasonic nanowelding is method for creating reliable and low-resistance contacts between SbSI nanowires and microelectrodes. The second thesis of work states that electrical, photoelectrical, and sensor properties of single SbSI nanowires and SbSI gel are different. SbSI nanowires were characterized by using techniques such as HRTEM, XRD, EDS, DRS, AFM, SEM, and measurements of current-voltage characteristics. Influence of various gases (nitrogen, oxygen, hydrogen, carbon dioxide, nitrous oxide, sulfur dioxide, ammonia and water vapor) on electrical and photoelectrical properties of single SbSI nanowires was investigated. Mechanism of interaction between the gas molecules and the SbSI nanowire surface was analyzed. It was found, that the electrical conductivity of sonochemically prepared SbSI nanowires is p-type. It is in agreement with data reported in literature for bulk SbSI crystals and SbSI nanowires obtained in the same technology of material preparation. High sensitive, selective, small sized and low power SbSI nanosensors can find applications as photodetectors, as well as humidity and gas sensors.