| Autor: |
Dey A; School of Engineering and Innovation , The Open University , Milton Keynes MK7 6AA , United Kingdom.; NASA Ames Research Center , Moffett Field , California 94035 , United States.; Universities Space Research Association , Mountain View , California 94043 , United States., Krishnamurthy S; School of Engineering and Innovation , The Open University , Milton Keynes MK7 6AA , United Kingdom., Bowen J; School of Engineering and Innovation , The Open University , Milton Keynes MK7 6AA , United Kingdom., Nordlund D; SLAC National Accelerator Laboratory , Menlo Park , California 94025 , United States., Meyyappan M; NASA Ames Research Center , Moffett Field , California 94035 , United States., Gandhiraman RP; NASA Ames Research Center , Moffett Field , California 94035 , United States.; Universities Space Research Association , Mountain View , California 94043 , United States. |
| Abstrakt: |
Miniaturization of electronic devices and the advancement of Internet of Things pose exciting challenges to develop technologies for patterned deposition of functional nanomaterials. Printed and flexible electronic devices and energy storage devices can be embedded onto clothing or other flexible surfaces. Graphene oxide (GO) has gained much attention in printed electronics due its solution processability, robustness, and high electrical conductivity in the reduced state. Here, we introduce an approach to print GO films from highly acidic suspensions with in situ reduction using an atmospheric pressure plasma jet. Low-temperature plasma of a He and H 2 mixture was used successfully to reduce a highly acidic GO suspension (pH < 2) in situ during deposition. This technique overcomes the multiple intermediate steps required to increase the conductivity of deposited GO. X-ray spectroscopic studies confirmed that the reaction intermediates and the concentration of oxygen functionalities bonded to GO have been reduced significantly by this approach without any additional steps. Moreover, the reduced GO films showed enhanced conductivity. Hence, this technique has a strong potential for printing conducting patterns of GO for a range of large-scale applications. |
