Full-Layer Controlled Synthesis and Transfer of Large-Scale Monolayer Graphene for Nitrogen Dioxide and Ammonia Sensing

Abstract

The controlled synthesis of large-scale monolayer graphene to be used in the development of cost-effective, mass-produced, and easy-to-use gas sensors for the real time monitoring of toxic gases is an important issue. In this study, scalable monolayer graphene was controllably synthesized by chemical vapor deposition on a copper substrate, and effectively transferred on a silica (insulator) substrate for gas sensing. A high-quality graphene layer was obtained by changing the growth conditions. Raman measurements indicated that large-area (1 × 1 cm²) monolayer graphene dominated the transferred films. Gas sensing characterizations demonstrated that monolayer graphene can effectively detect NO₂ and NH₃ within the temperature range of 100°C to 200°C.

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Keywords:

• CVD
• Full-layer
• Gas sensor
• Graphene
• Raman

Acknowledgments

This work was supported by the National Foundation for Science and Technology Development (Nafosted) Research Program (Code 103.02-2011.42).