کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1678401 | 1009941 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A study on conformational changes by electron charges in viologen single molecules by using STM
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The topography of self-assembled viologen derivatives (VC8SH, VC10SH, HSC8VC8SH, and HSC10VC10SH) molecules on an octanethiol (C8) self-assembled monolayer (SAM) modified gold surface was measured using ultrahigh-vacuum scanning tunneling microscopy (UHV-STM). We demonstrate here a novel matrix SAM appropriate for isolation of the viologen molecules. The C8 was used for a matrix SAM, in which the VC8SH, VC10SH, HSC8VC8SH, and HSC10VC10SH were inserted at molecular lattice defects. The isolated single molecules of viologen derivatives inserted in the matrix SAM were observed as protrusions in STM topography using a constant current mode. We measured the topographic heights (VC8SH: 1.53Â nm, VC10SH: 2.01Â nm, HSC8VC8SH: 2.71Â nm, and HSC10VC10SH: 3.3Â nm) of the molecular protrusions using STM. Also, changes in the central axis of viologen molecules were observed as VC8SH (0.5-0.73Â nm), VC10SH (0.4-0.74Â nm), HSC8VC8SH (0.67-0.84Â nm), and HSC10VC10SH (0.67-0.99Â nm), respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 108, Issue 10, September 2008, Pages 1101-1105
Journal: Ultramicroscopy - Volume 108, Issue 10, September 2008, Pages 1101-1105
نویسندگان
Nam-Suk Lee, Won-Suk Choi, Hoon-Kyu Shin, Dong-Jin Qian, Young-Soo Kwon,