Comparing characterization of functionalized multi-walled carbon nanotubes by potentiometric proton titration, NEXAFS, and XPS

doi:10.1016/S1872-2067(14)60123-6

Abstract

Abstract:

Since the discovery of carbon nanotubes (CNT), this material has been recognized as an attractive catalyst support. CNT must be functionalized before use as a catalyst support and typically this involves oxidation. However, the functional group distribution on the CNT is very complex mixture of groups and varies with oxidation agent used. Here a simple acid-base titration is introduced to characterize the oxygen functionalized CNT. By comparing characterization with near-edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy (XPS) for both at the C and O K-edges, it can be demonstrated that potentiometric proton titration can be a fast and quantitative analysis for Brönsted acid functional groups on CNT.

Key words: Carbon nanotubes, Functionalization, Potentiometric titration, X-ray photoelectron spectroscopy, Near-edge X-ray absorption fine structure

Zhiteng Zhang, Lisa Pfefferle, Gary L. Haller. Comparing characterization of functionalized multi-walled carbon nanotubes by potentiometric proton titration, NEXAFS, and XPS[J]. Chinese Journal of Catalysis, 2014, 35(6): 856-863.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60123-6

https://www.cjcatal.com/EN/Y2014/V35/I6/856

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