Maryam Bonyani

Ag-doped nanostructured materials for electrochemical sensors

Silver nanoparticles (AgNPs) embedded within polymethacrylic-acid (PMA) matrix were prepared by a simple chemical route. The obtained AgNPs@PMA composite sample was characterized by means of UV-Vis spectroscopy, SEM, TEM, XPS and used as electrodic material for electrochemical sensors. The electrocatalytic properties of a fabricated AgNPs@PMA/CNTs-modified electrode was investigated by cyclic voltammetry. A voltammetric sensor based on a disposable carbon electrode modified by AgNPs@PMA/CNTs composites has been developed for nitrate monitoring in water at neutral pH.

Electrical Characterization of Microstrip Resonators Based on Nanostructured Sensing Materials

In this paper is reported the development of microstrip resonators working in the frequency range of 3–6 GHz and their employment in the investigation of the sensing properties of nanostructured materials towards gas. The materials are deposited as films on the gap of the resonators by drop coating aqueous solutions of Ag@α-Fe2O3 nanocomposite having a core–shell structure. Here are reported sensing data about humidity monitoring in the range from 0 to 70%. The increase of humidity value brings to a large frequency shift of the resonance one. The good characteristics of the fabricated device suggest its promising use as humidity sensor.

Stable Aqueous Solution for the Fabrication of α-Fe 2 O 3 Thin Film-Based Chemoresistive Sensors

In this paper, stable water solution using a Pechini sol-gel process was prepared. The solution was used for the direct printing of iron oxide precursor on alumina substrates. To convert the precursor to the desired iron oxide phase, an annealing step was carried out at elevated temperatures (>450 °C). In this work a α-Fe2O3 thin film-based chemoresistive sensors for ethanol detection in air were fabricated. The device developed was investigated for evaluate the sensing characteristics such sensitivity, selectivity and stability.