Observation of negative differential resistance in mesoscopic graphene oxide devices

Servin Rathi, Inyeal Lee, Moonshik Kang, Dongsuk Lim, Yoontae Lee, Serhan Yamacli, Han Ik Joh, Seongsu Kim, Sang Woo Kim, Sun Jin Yun, Sukwon Choi, Gil Ho Kim

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


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.

Original languageEnglish (US)
Article number7144
JournalScientific reports
Issue number1
StatePublished - Dec 1 2018

All Science Journal Classification (ASJC) codes

  • General


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