BROWSE

Related Scientist

CNCR's photo.

CNCR
나노물질 및 화학반응 연구단
more info

ITEM VIEW & DOWNLOAD

In-Situ Nanotribological Properties of Ultrananocrystalline Diamond Films Investigated with Ambient Pressure Atomic Force Microscopy

Cited 0 time in webofscience Cited 0 time in scopus
18 Viewed 0 Downloaded
Title
In-Situ Nanotribological Properties of Ultrananocrystalline Diamond Films Investigated with Ambient Pressure Atomic Force Microscopy
Author(s)
Jae-Eun Kim; Joong Il Jake Choi; Jeongjin Kim; Bongjin Simon Mun; Ki-Jeong Kim; Jeong Young Park
Publication Date
2021-04
Journal
Journal of Physical Chemistry C, v.125, no.12, pp.6909 - 6915
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society.The relationship between nanoscale friction and the surrounding environment has long been a critical issue in the field of nanotribology. Here, we utilized ambient pressure-atomic force microscopy to investigate the effect of environmental gas on nanoscale friction of ultrananocrystalline diamond (UNCD) films. The frictional forces were measured in an atomic force microscopy (AFM) chamber in the environmental range from an ultrahigh vacuum to near ambient pressure in the presence of oxygen, nitrogen, and water. We observed that friction increased with the pressure of the oxygen responsible for the oxidation of the surface of the UNCD, while that in nitrogen gas remained unchanged. Interestingly, friction decreased in water, due to the tribochemical reaction caused by surface passivation. When two diamond materials come into contact under water conditions, the water molecules are dissociated because of normal pressure between the AFM tip and diamond surface, and the dissociative water molecule adsorption passivates the surfaces of the diamond-coated tip and UNCD, resulting in a reduction of friction force. The chemical state of the UNCD surface in various environmental conditions was confirmed using near ambient pressure X-ray photoelectron spectroscopy. This result elucidates the role of vapor-phase oxygen and water in the tribological properties of carbon-based materials.
URI
https://pr.ibs.re.kr/handle/8788114/9698
DOI
10.1021/acs.jpcc.1c00454
ISSN
1932-7447
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
There are no files associated with this item.

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse