Investigation of ITO based liquid sensor for ammonia hydroxide detection

TL;DR

This paper investigates an ITO-based sensor's ability to detect ammonia hydroxide in seawater, demonstrating a linear resistance response and analyzing its sensing mechanism and stability for hazardous substance detection.

Contribution

It introduces a novel ITO sensor for NH4OH detection in seawater, explaining its sensing mechanism and verifying its chemical stability.

Findings

Resistance change linearly correlates with NH4OH concentration

Sensing mechanism involves reduction and electrical double layer formation

Sensor shows chemical stability for hazardous substance detection

Abstract

We proposed an Indium Tin Oxide (ITO) sensor for detecting the NH4OH in seawater and carried out a series of experiments to investigate the feasibility of it as a hazardous and noxious substance (HNS) sensor. The ITO layer revealed a distinct resistance change ({\delta}R) which is linearly correlated with the NH4OH concentration. Sensing mechanism of the porous ITO layer has been explained in terms of reduction and electrical double layer (EDL) formation. Also, the chemical stability of ITO as a HNS sensor has verified.