A Study on the Current-Voltage Characteristics of Self-Assembled Nitro-group and Methoxy-group Organic Molecules by Using STM

STM을 이용한 자기조립된 니트로기와 메톡시기 유기분자의 전압-전류 특성 연구

  • 김승언 (동아대학교 전기공학과) ;
  • 박상현 (동아대학교 항만물류시스템공학과) ;
  • 박재철 (영진전문대학 인터넷전자정보계열) ;
  • 신훈규 (동아대학교 전기공학과) ;
  • 권영수 (동아대학교 전기공학과)
  • Published : 2004.11.05

Abstract

In this study, we fabricated the organic thin film by self-assembly method by using nitro-group and methoxy-group organic molecule. Also, we selected the organic single molecule in organic thin film and measured current-voltage characteristics by using scanning tunneling microscopy. The Organic molecules that use in an experiment is 4,4'-(diethynylphenyl)-2'-nitro-1-benzen ethiol and 4-[2,5-dimethoxy-4-ph enylethynylphenyl]ethynylphenylethanthiol. 4,4'-(dimet hynylphenyl)-2'-nitro-1-benzenethiol is applied widely in molecular electronic device and 4-[2,5-dime thoxy-4-phenylethynylphenyl]ethynylphenylethanthiol composed in Korea Research Institute of Chemical Technology. To be confirmed the formation of the self-assembled monolayers, we observed the real time frequency shift of the QCM and investigated surface of the self-assembled monolayers the using STM. With this, we measured current to the organic single molecule, in condition of the air state. As a result, we confirmed in constant voltage that properties of negative differential resistance. Using properties of negative differential resistance to get from this study, application is expected to be molecular switching device, memory device and logic device.

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