title: Electrical characterization of organic monolayers at a nanoscale.
abstract: This study investigates the electrical properties of viologen derivatives at a nanoscale and analyzes it using a scanning tunneling microscopy (STM) in order to apply viologen molecules that represent a function in electron transfer mediators as a molecular electronic device. In addition, we measure conformational changes in the viologen molecular protrusions using STM and investigate changes in the width and height of the alkyl group that are due to the change in the polarity of viologen molecules by electron charges. In this experiment, high peak current is observed, such as a rectification at +1.14 V. Thus, according to the results of this experiment the rectification ratio [RR = J (at +2.5 V)/J (at -2.5 V)] of the viologen is found by 4.47 (HSC8VC8SH). Similar results are also obtained in some other cases of viologen derivatives.
authors.forename: Nam-Suk
authors.initials: NS
authors.lastname: Lee
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Kwon
authors.forename: Hoon-Kyu
authors.initials: HK
authors.lastname: Shin
mesh_terms: D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004579:Electron Transport; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009930:Organic Chemicals / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D014755:Viologens / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals; D014755:Viologens