Sensing Formaldehyde Using Graphene Oxide as Sensing Material

Murthy Chavali
2018 Research & Development in Material Science  
Nanomaterials have been widely used in analytical chemistry as chemical sensor and biosensor materials. Graphene, a kind of nanomaterial, has attracted attention increasingly since it was isolated in 2004 showing promising applications in scientific and technological fields owing to its novel properties such as electrical, thermal, and mechanical properties. Graphene and its derivatives including graphene oxide (GO) have attracted everincreasing attention in recent years as a novel class of 2D
more » ... novel class of 2D carbon-based nanomaterials with the promise of a range of applications. GO has large surface area, excellent conductivity, good chemical stability and easy fabrication; in combination makes GO the paramount materials in the fields of sensors. A graphene oxide (GO) based formaldehyde sensor to detect at room temperature was developed. Graphene oxide was synthesised by modified Hummers method. FT-IR spectra of the graphene oxide revealed these -OH and -COOH functional groups were formed on the graphene surface. XRD patterns also showed the formation of graphene oxide material. The p-type semiconductor sensing material of GO was performed and at room working temperature. It was tested as 10 to 50ppm HCHO concentrations for GO, and the sensor response was raised from 2.11 to 6.98. Using Material Studio 4.3 software, the adsorption phenomena were explained to the HCHO sensing property. Volume -7 Issue -2 and tungsten, halogen lamps, respectively, and the wavelengths scanned between 200 to 800nm. Fourier transform infrared (FT-IR) spectra of the graphene oxide were done with Alpha-T FT-IR (Bruker Optics, Germany) equipped with a deuterated L-alanine doped triglycene sulphate (DLaTGS) detector. Transparent film material was measured directly over ZnSe ATR without any sample preparation. The spectrum was collected with 64 scans at room temperature and at a resolution of 4cm -1 . The sensing materials were characterised by X-ray diffractometer (XRD); Shimadzu XRD 6000; X-ray Tube-Cu (1.54060 Å). Various samples were identified by 2° angles, and the particle planes were estimated (XRD voltage: 40.0keV and current: 30.0mA). The scanning 2° range was between 10°-70°, at a scanning rate of 4°/min. A series of molecular dynamics/simulations calculated the bonding energy for HCHO molecule adsorption into the graphene oxide surface using Material Studio software, Version 4.3 (Accelrys Software Inc., USA, By applying the discovery method of the software, the parameters were chosen to minimise the system energy, and the force field was chosen as the compass item. The calculated energy could be estimated, and the adsorption and desorption interaction phenomena of HCHO molecule and GO could, therefore, be obtained. Volume -7 Issue -2 The responses of the sensor were 2.11 and 6.98 (S=R HCHO /R Air ) to the concentrations of 10 and 50ppm, respectively. Table 1 revealed that the response and recovery times were decreasing by increasing the formaldehyde concentration from 10 to 50ppm in graphene oxide. It showed on 10ppm formaldehyde the response and recovery times were742 and 1200s, respectively, and to 50ppm formaldehyde, the response and recovery times were decreasing as 398 and 587s, respectively. How to cite this article: Murthy C, Srinivasan K, Ren J W. Sensing Formaldehyde Using Graphene Oxide as Sensing Material. Res Dev Material Sci . 7(2).
doi:10.31031/rdms.2018.07.000660 fatcat:ffwwjvlydjdmnjsacfeqnj7xlu