Research Project
Grant-in-Aid for Challenging Exploratory Research
The hydrogen bond was investigated with atomic resolution by a homebuilt non-contact atomic force microscope (nc-AFM) in ultrahigh vacuum. The hydrogen bond [X-H…A] was made with an apex atom of a clean Si tip as a proton acceptor (A) and a proton donor (X-H) adsorbed on a sample substrate. The samples were Si(111)7x7 surfaces adsorbed NH2 group and H group. I identified those adsorption sites from Nc-AFM images, tunneling current images and Δf- distance curves. The maximum covalent bonding force of Si-Si was approximately 1.0 (nN). I estimated that the hydrogen bonding force between the NH2 group and the Si tip [Si-N-H…Si] was approximately 0.05 (nN) and between the H group and the Si tip [Si-H…Si] was approximately 0.1 (nN).
All 2016 2015 2014
All Journal Article (6 results) (of which Int'l Joint Research: 1 results, Peer Reviewed: 6 results, Open Access: 4 results, Acknowledgement Compliant: 4 results) Presentation (29 results) (of which Int'l Joint Research: 4 results)
Review of Scientific Instruments
Volume: 87 Issue: 2
10.1063/1.4941065
Applied Physics Express
Volume: 9 Issue: 4 Pages: 046601-046601
10.7567/apex.9.046601
210000137866
Phys. Rev. B
Volume: 93 Issue: 16
10.1103/physrevb.93.165415
Langmuir
Volume: 31 Issue: 13 Pages: 3876-3883
10.1021/acs.langmuir.5b00087
Appl. Phys. Lett.
Volume: 105 Issue: 4
10.1063/1.4891882
120005650332
J. Phys. Chem. C
Volume: 118 Issue: 43 Pages: 25104-25109
10.1021/jp508680a