Synthesis, Characterization and Gas Sensing Properties of Graphene Oxide-Multiwalled Carbon Nanotube Composite

• Published in: Journal of materials science & technology Vol. 32; no. 7; pp. 626 - 632
• Main Authors: Kavinkumar, T., Manivannan, S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-07-2016
• Subjects: Fiber optic gas sensor; GO-MWCNT composite; Graphene oxide (GO); Multiwalled carbon nanotube (MWCNT); 光纤气体传感器; 合成; 扫描电子显微镜; 气敏性能; 氧化石墨; 碳纳米管复合材料; 表征; 近红外光谱技术; GO-MWCNT composite; Multiwalled carbon nanotube (MWCNT); Fiber optic gas sensor; Graphene oxide (GO)
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2016.03.017

Graphene oxide （GO）-multiwalled carbon nanotube （MWCNT） composite was synthesized and characterized by X-ray diffraction, atomic force microscopy, scanning electron microscopy, micro Raman, Fourier transform infrared and ultraviolet-visible near infrared spectroscopy techniques. Spectral characteris- tics of cladding modified fiber optic gas sensors were studied for various concentrations of ammonia, ethanol and methanol at 27 ℃. Thickness of the gas sensing layer was controlled by varying the concentration of composite in ethanol medium （0.5 and 1 mg/mL） for three times dipping process. The O.S mg/ mL concentrated GO-MWCNT coated sensor showed 1.20, 1.40 and 1.15 times higher sensitivity than the GO coated sensor for ammonia, ethanol and methanol vapors, respectively. Furthermore, it exhibited 1.50, 1.80 and 1.80 times better sensitivity than 1 mg/mL concentrated GO-MWCNT coated sensor for ammonia, ethanol and methanol vapors, respectively. The presence of functional groups in GO increased the sen- sitivity. This is mainly attributed to the effective electron charge transfer between the composite materials and analytes.