Preparation of chemical vapor sensor by reduction graphene oxide doped with nanoparticles of gold on porous silicon using photoluminescence.

In this research, the nanoparticles of gold (AuNPs) was used for doping graphene (rGO) nanocomposites, then deposted on porous silicon (PS) for high sensitivity of chemical vapors sensor such as n -Hexane, Ethanol, and chloroform. The graphite electrodes were used for the production of rGO by electrochemical exfoliation method. The pulsed Nd:YAG laser system with 1064 nm of wavelength, and laser energy of 400 mJ for 600 pulses was used for AuNPs preparation. Then the electrochemical etching (ECE) system was used for prepared PS with the variation of etching current densities: 2, 4 and 6 mA/cm2 for 15 min etching time. The comparison of rGO:AuNPs/PS with PS surface was studied for a chemical vapors sensor. The X-ray diffraction (XRD), Atomic Force Microscopic (AFM), Scannin electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) were performed for studying the Structural, morphological and surface bond configuration respectively and the UV–vis spectrophotometer applied for calculating transmittance ratio of hybrid materials. The Photoluminescence (PL) test was conducted for all samples using PL system on the three kinds of organic chemical solvents, by mixing with gas of nitrogen, in which prepared for using as the sensor of organic vapors. All results showed that the hybrid doping of rGO:AuNPs layers on the PS surface lead to rise of PL peak, and modify the PS feature as organic chemical vapor sensor. [ABSTRACT FROM AUTHOR]