Uniform decoration of silver nanoparticle on exfoliated graphene oxide sheets and its ammonia gas detection

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• 作者：T. Kavinkumar ; S. Manivannan ; ^{ksmani@nitt.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Graphene oxide ; Reduced graphene oxide ; Silver nanoparticles ; Fiber optic gas sensor ; Ammonia sensor
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1769-1776
• 全文大小：2193 K

文摘

Silver nanoparticles (AgNP) decorated graphene oxide (GO) sheets were prepared by reducing AgNO₃ with vitamin C in the presence of GO. Different molar concentration of AgNO₃ played a significant role in the size of AgNP in GO. The synthesized AgNP–GO composites were characterized by powder X-ray diffraction, scanning electron microscopy, ultraviolet–visible–near infrared, Fourier transform infrared and micro Raman spectroscopy techniques. We demonstrated the fiber optic gas sensor using reduced graphene oxide (rGO) and AgNP–GO composites for 0–500 ppm ammonia vapor concentrations at 27 °C. Sensitivities of rGO, 0.1 M AgNP–GO and 0.6 M AgNP–GO composites coated fiber optic sensors were calculated as −0.08, −0.177, −0.12 counts/ppm respectively. The agglomeration of AgNP at 0.6 M concentration along with increased particle size significantly decreased the sensing performance.