Effect of ethanol in an inorganic salt detector based on porous silicon

Abstract

A porous silicon (PSi) chemical sensor for detection of chloride ions in aqueous solution is reported. The sensor setup is based on the semiconductor/electrolyte system used for the analysis of semiconductor surfaces. AC frequency response signals have been obtained in non‐ethanoic and ethanoic solutions containing small concentrations of chloride ions. Discussion of the results is provided. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Development of an organic vapor sensor based on functionalized porous silicon

“…The exposed area to the solution was a disk of 0.13 cm 2 . The resulting porosity was around 70% (calculated by gravimetric methods), with a thickness in the range of 40–50 µm, and mean pore diameter of 2–3 µm 7.…”

“…A previous paper of this group focused on the problem of detecting traces of inorganic ions in aqueous solutions using AC methods 7. In the present study, a DC methodology is used to detect variations in the electric response of a p‐Si surface functionalized with 4‐aminopyridine in the presence of an organic solvent vapor.…”

Transient Response in Aqueous Solution of an Anions Porous Silicon Based Sensor

“…All measurements were performed using the mentioned test solutions. We have shown previously [3] that this kind of sensor is able to detect anions in solution (Cl -), so in this work no further mention of cations (K + ) will be made.…”

“…Although porous silicon was studied firstly as a potential material for applications in the development of optoelectronic devices [1], the interest has shifted to many other fields, one of them being the use of this material as a sensing surface for detection of chemical species in gas [2] or liquid phase [3], or for biomedical applications [4], [5]. To accomplish this objective, this material must fulfill a series of protocols requiring specificity in the detection of particular molecules.…”

“…To accomplish this objective, this material must fulfill a series of protocols requiring specificity in the detection of particular molecules. One of such examples is the capability to sense pollutant salts in water, specifically anions [3]. One way to perform anion detection in such ambient is to use the Semiconductor/Electrolyte system [6], where an electrolyte containing anions is put in contact with the porous surface.…”