Reduced graphene oxide obtained using the spray pyrolysis technique for gas sensing

Abstract

Graphene oxide films were formed using the ultrasonic spray coating method and studied with micro-Raman spectroscopy, atomic force microscopy, and electrical dynamic response of resistance measurements. Effect of different gases (water vapor, ethanol, acetone, ammonia, and isopropyl) on the dynamic response of resistance of the Au / graphene oxide / Au structure has been studied. The dynamic response shows that adsorption of all mentioned gases results in increase of the resistance. For ethanol, acetone and isopropyl adsorption and desorption cycles are almost identical. At the same time, in the case of water vapor and ammonia the cycle of desorption is very week, especially for the former, which attests different mechanisms of adsorption/desorption processes regarding to ethanol, acetone and isopropyl. The mechanisms of studied vapors adsorption/desorption are proposed.

Fabrication of Graphene Oxide-Based Resistive Switching Memory by the Spray Pyrolysis Technique for Neuromorphic Computing

“…The SPT has been used because it is simple and involves cost-effective equipment. Both spin coating and SPT are simple and low-cost, but SPT involves controllable equipment. , Therefore, the deposition rate and the film’s thickness can be simply controlled by changing the spray parameters. The experimental setup of the spray pyrolysis technique used in this study is shown in Figure c.…”

“…77,78 SPT has been widely utilized in the solar cell industry to build thin films on glass substrates. 79,80 This technique has also been used to grow carbon nanotubes (CNTs) 81 and GO 78 and rGO 82 thin films for application in sensors. However, it has not yet been implemented in the GO RRAM fabrication process.…”

“…The spray pyrolysis technique (SPT) is a simple and useful method to grow nanostructures. , Spray pyrolysis is a method in which a solution is sprayed on a heated surface to create a thin film . The SPT has several advantages including batch fabrication, simplicity, cost efficiency, several control parameters, and short-time fabrication. , SPT has been widely utilized in the solar cell industry to build thin films on glass substrates. , This technique has also been used to grow carbon nanotubes (CNTs) and GO and rGO thin films for application in sensors. However, it has not yet been implemented in the GO RRAM fabrication process.…”

Nanoscale morphology tailoring in plasma deposited CN x layers

“…Pure carbon is well known as a hydrophobic material and adsorbed water layer is localized on the carbon surface. Chemical hydrophilicity and structural defects in the nitrated carbon material enhance penetration of water molecules deeper under the surface layers, increasing the electrical resistance through reversible band gap transition of the graphene-like material with respect to the humidity level [23,24] or by penetration into the space between the graphenelike layers and weakening of the electrical transport between the layers [25,26].…”

A Review on Functionalized Graphene Sensors for Detection of Ammonia

“…Unlike CVD-G, the size, thickness, and uniformity of the GO dispersions are not well controlled presently. As shown in Figure 12 , some clusters are formed by the accumulation of multiple-layer rGO [ 154 ]. In this case, NH 3 molecules adsorbed on the cluster top cannot influence electric current passing through the cluster bottom.…”