TAILIEUCHUNG - Improving the ammonia sensing of reduced graphene oxide film by using metal nano-materials

In this paper, we report the ammonia (NH3) sensing behavior of rGO based sensors functionalized with nano-structured metal: silver (Ag) or platinum (Pt) or gold (Au) in air at room temperature and atmospheric pressure. The gas response is detected by the monitoring changes in electrical resistance of the rGO/metal hybrids due to NH3 gas adsorption. Compared to bare rGO, significantly improved NH3 sensitivity is observed with the addition of nanostructured metals. These materials are applied to play the small bridges role connecting many graphene islands together to improve electrical conduction of hybrids while maintaining the inherent advantage of rGO for NH3 gas sensitivity. | Science & Technology Development, Vol 18, Improving the ammonia sensing of reduced graphene oxide film by using metal nano-materials Huynh Tran My Hoa Hoang Thi Thu Nguyen Thi Phuong Thanh Nguyen Ngoc Tham Bui Thi Tuyet Nhung On Thi Thanh Trang Tran Quang Trung University of Science, VNU-HCM Lam Minh Long HCM City Vocational of College University of Engineering and Technology, VNU-HN (Received on December 04th 2014, accepted on September 23rd 2015 ) ABSTRACT Gas sensing is one of the most promising applications for reduced graphene oxide (rGO). High surface-to-volume ratio in conjunction with remaining reactive oxygen functional groups translates into sensitivity to molecular on the rGO surface. The response of the rGO based devices can be further improved by functionalizing its surface with metal nano-materials. In this paper, we report the ammonia (NH3) sensing behavior of rGO based sensors functionalized with nano-structured metal: silver (Ag) or platinum (Pt) or gold (Au) in air at room temperature and atmospheric pressure. The gas response is detected by the monitoring changes in electrical resistance of the rGO/metal hybrids due to NH3 gas adsorption. Compared to bare rGO, significantly improved NH3 sensitivity is observed with the addition of nanostructured metals. These materials are applied to play the small bridges role connecting many graphene islands together to improve electrical conduction of hybrids while maintaining the inherent advantage of rGO for NH3 gas sensitivity. Key word: reduced graphene oxide, silver nanowires, polyol method, NH3 gas sensing. INTRODUCTION Recent studies revealed that the reduced graphene oxide or chemically modified graphene (rGO) can be served as high performance molecular sensors because rGO contains a range of reactive oxygen functional groups. Many groups extensively studied molecular adsorption on rGO and proposed that the active defective Trang 72 sites provided by the residual .

• Hoá học
• Improving the ammonia sensing
• Reduced graphene oxide film
• Metal nano materials
• High surface to volume ratio
• The monitoring changes
• NH3 gas adsorption
• Gas adsorption
• Sc2CO2 monolayer
• Vacancy defect
• First principles calculations
• Gas molecules
• U shaped GRNs
• CO2 Adsorbed on Graphene
• NH3 Adsorbed on Graphene
• Graphene gas sensors
• Adsorption energy
• Transmission spectrum