Multi‐sensor chip for the investigation of different types of metal oxides for the detection of H₂O₂ in the ppm range

Abstract

In this work, a multi-sensor chip for the investigation of the sensing properties of different types of metal oxides towards hydrogen peroxide in the ppm range is presented. The fabrication process and physical characterization of the multisensor chip are described. Pure SnO 2 and WO 3 as well as Pdand Pt-doped SnO 2 films are characterized in terms of their sensitivity to H 2 O 2 . The sensing films have been prepared by drop-coating of water-dispensed nano-powders. A physical characterization, including scanning electron microscopy and X-ray diffraction analysis of the deposited metal-oxide films, was done. From the measurements in hydrogen peroxide atmosphere, it could be shown, that all of the tested metal oxide films are suitable for the detection of H 2 O 2 in the ppm range. The highest sensitivity and reproducibility was achieved using Pt-doped SnO 2 .Calibration plot of a SnO 2 , WO 3 , Pt-, and Pd-doped SnO 2 gas sensor for H 2 O 2 concentrations in the ppm range.

Immobilizing Gold Nanoparticles in Mesoporous Silica Covered Reduced Graphene Oxide: A Hybrid Material for Cancer Cell Detection through Hydrogen Peroxide Sensing

“…A solution was proposed using nonenzymatic artificial biosensors. In particular, precious metal nanoparticles, , carbon nanomaterials, , and metal oxide/sulfide semiconductors , have been widely employed due to their unique electronic and catalytic properties to enhance catalytic activity, high surface to volume ratio, suitable biocompatibility, low cost preparation, and good stability. Among various nanoparticles, gold nanoparticles (AuNPs) provide an appropriate platform for the immobilization of biomolecules to retain their biological activity and to facilitate the electron transfer between the immobilized biomolecules and electrode substrates, leading to enhanced analytical performance as compared to other biosensors .…”

Room Temperature Detection of Hydrogen Peroxide Vapor by Fe2O3:ZnO Nanograins

“…At RT (<200 °C), O 2 − oxygen species play the main role in the gas sensing mechanism of the Fe 2 O 3 :ZnO sensor, leading to rather high sensitivity. This was observed because the UV rays not only induced the physisorption of HPV molecules on the Fe 2 O 3 :ZnO surface, but also stimulated the chemisorption processes [ 43 ].…”

“…Under these conditions, an electron depletion layer is formed on the surface of the Fe 2 O 3 :ZnO nanograins, and the corresponding electrical resistance is established. Here, double Schottky barriers are formed at the intergranular junction of the Fe 2 O 3 :ZnO nanograins [22,43,44].…”

Efficient and rapid microwave-assisted route to synthesize Pt–MnOx hydrogen peroxide sensor

“…They can be combined with a conducting support to promote electron transfer and provide a remarkable synergistic effect because unsupported metal oxide catalysts have very low surface areas, decreasing the sensing activity. With these purposes, several metal oxides such as ZnO, CuO, Co 3 O 4, MnO 2 have been used for the fabrication of sensors [13][14][15][16][17][18]. Among all the metal oxides, MnO 2 is an attractive inorganic material because of its low cost and high catalytic ability towards H 2 O 2.…”