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Title: What does nitric acid really do to carbon nanofibers? [What nitric acid really does to carbon nanofibers]

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [1];  [3];  [1];  [3];  [1]
  1. Aalto Univ., Espoo (Finland)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. NASA Ames Research Center, Moffett Field, CA (United States)

Understanding the chemical nature of the surface of carbon nanofibers (CNF) is critical in assessing their fundamental properties and tailoring them for the right application. To gain such knowledge, we present here a detailed X-ray adsorption spectroscopy (XAS) study accompanied by high resolution transmission electron microscopy (TEM) micrographs of two morphologically different CNF pairs (tetrahedral amorphous carbon (ta-C) grown “open structured” fibers and traditional bamboo-like “closed structured” fibers), where the surface chemical properties and structural features of the fibers are investigated in depth and the effects of nitric acid treatment on the fibers are revealed. The morphology of the fiber and/or the original seed- and adhesion layers markedly affect the response of the fibers to the acid treatment. Results also show that the nitric acid treatment increases the observed sp2 intensity and modifies the two types of fibers to become more-alike both structurally and with respect to their oxygen functionalities. Furthermore, the XAS and HRTEM results confirm that a short nitric acid treatment does not remove the Ni catalyst particle but, instead, oxidizes their surfaces, especially in the case of ta-C grown fibers.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; 285015; 285526
OSTI ID:
1360206
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 39; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (1)

Integrating Carbon Nanomaterials with Metals for Bio-sensing Applications journal September 2019