The fractions of various functional groups in graphene oxide (GO) are directly related to its electrical and chemical properties and can be controlled by various reduction methods like thermal, chemical and optical. However, a method with sufficient controllability to regulate the reduction process has been missing. In this work, a hybrid method of thermal and joule heating processes is demonstrated where a progressive control of the ratio of various functional groups can be achieved in a localized area. With this precise control of carbon-oxygen ratio, negative differential resistance (NDR) is observed in the current-voltage characteristics of a two-terminal device in the ambient environment due to charge-activated electrochemical reactions at the GO surface. This experimental observation correlates with the optical and chemical characterizations. This NDR behavior offers new opportunities for the fabrication and application of such novel electronic devices in a wide range of devices applications including switches and oscillators.
|Publication status||Published - 2018 Dec 1|
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2016R1A2A2A05921925, and 2016R1D1A1B03932455) and Korea Research Fellowship Program through the NRF funded by the Ministry of Science, ICT and Future Planning (2015H1D3A1062519). This work was partly supported by Institute for Information & Communications Technology Promotion grant funded by the Korea government (MSIT, Grant No. 2016-0-00576, Fundamental technologies of two-dimensional materials and devices for the platform of new-functional smart devices).
© 2018 The Author(s).
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