Room temperature CO2 gas sensors of AuNPs/mesoPSi hybrid structures

Abstract

Mesoporous silicon (mesoPSi) layer prepared by a laser-assisted etching process in HF acid has been employed as CO 2 gas sensors. The surface morphology of mesoPSi was modified by embedding gold nanoparticles AuNPs by simple and quick dipping process in different gold salts concentrations to form mesoPSi/AuNPs hybrid structures. Morphology of hybrid structures was investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrical characteristics of the prepared gas sensor were carried out at room temperature. It was found that the nanoparticles size, shape and the specific surface area of the nanoparticle strongly influence the current-voltage characteristics. Considerable improvement was noticed in sensitivity, response and recovery times of gas sensor with decreasing incorporated AuNPs into the mesoPSi matrix.

Gold-carbonaceous materials based heterostructures for gas sensing applications

“…Recently, Au NPs of different shapes and sizes were incorporated in the mesoporous silicon layer to be used as CO 2 gas sensors. 99 In recent work, it was explored that Au NPs deposited on the surface of ZnO microstructure gave better gas response towards ether than pure ZnO microstructures. 100 The gas response was shown to be increased with an increase in temperature.…”

Well-Controlled Generation Process of Bimetallic Ag//Au Colloidal Nanoparticles by Non-Thermal Plasma DC Glow Discharge

“…The two characterization peaks for Ag//Au core//shell NPs clarify that they are crystallized in (fcc) structure. The particle size of Ag//Au core//shell NPs was determined by using Scherer formula [19,20]: 3) g/cm 3 [22,23], respectively, and according to the discharge exposure times (5, 10, and 15 min), the density of the bimetallic Ag//Au core//shell NPs is about (13.8, 15.2, and 15.6 g/cm 3 ), respectively. The value of density for Ag//Au core//shell NPs can be determined using equation ( 5) depending on the data about the EDS analysis of results of Ag//Au core//shell NPs The highest value of the specific surface area is about (73.7 m 2 /gm), and the lowest (D) value is about (5.2 nm) for discharge time (15 min), respectively.…”

2-D organization of silica nanoparticles on gold surfaces: CO2marker detection and storage

“…Nanoparticles (NPs) exhibit unique chemical, physical and electronic properties that are different from those of bulk materials, they indeed own outstanding catalytic, thermal and optical properties as well as robust mechanical strength and a large surface-to-volume, making them good candidates to construct sensing devices, based on clustered-nanoparticles. Although CO 2 nanoparticle based sensors have been mentioned in the literature during the last decades, [9][10][11] they have been barely implemented and developed for practical applications as they require a complex nanoparticle deposition set-up, which most of the times leads to either NP-aggregates 12 or multilayers. 13 Silica NPs, (SiO 2 NPs) in solid state, have never been investigated as a potential CO 2 sensing agent.…”