NDLI: π-Plasmon absorption of carbon nanotubes for the selective and sensitive detection of Fe<sup>3+</sup> ions

Content Provider	Royal Society of Chemistry (RSC)
Author	Gao, Yuan Cheung, William Lockard, Jenny V. He, Huixin Patel, Mehulkumar Chen, Yuan Xie, Qiaoqiao Ma, Yufeng
Copyright Year	2016
Abstract	Inspired by the remarkable electronic and optical properties of single walled carbon nanotubes (SWNTs), various molecular sensing devices with sensitivity down to the single molecule level have been developed. However, most sensing approaches such as field effect transistors or near infrared (NIR) fluorescence require the rigorous debundling and separation of metallic tubes and semiconducting tubes in order to reach the desired high sensitivity. Interestingly, all carbon nanomaterials including carbon nanotubes, graphite, graphene, and even amorphous carbon exhibit extremely strong π-plasmon absorption in the ultraviolet region. This strong absorption has been studied as an undesired optical background for applications based on visible and NIR absorptions. For the first time, we found that the strong π-plasmon absorption of SWNTs in the ultraviolet region is extremely sensitive to ion binding. It is even much more sensitive than the absorption in the visible and NIR regions. Herein, we present our first exploration into using the extremely strong plasmon absorption of SWNTs to develop a new sensing platform for the detection of metallic ions. The detection selectivity is realized by modifying the surface of SWNTs with molecular ligands that have a high specificity for metal ions. As a demonstration, the new method is applied to selectively detect iron ions (Fe3+) by modifying the surface of the SWNTs with deferoxamine (DFO), a natural bacterial siderophore, which has a high specificity and affinity for Fe3+. The selective detection of Fe3+ in both aqueous solution and complex rain water is achieved with a pM level of sensitivity and detection limit. In situ resonant Raman spectroscopy demonstrated that the sensitive detection possibly involves electron transfer between the formed Fe–DFO complexes and the SWNTs. We envisage that it can be used to detect other metal ions when a specific binding chelator is attached to the carbon nanotube surface.
Starting Page	5192
Ending Page	5199
Page Count	8
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	7
Issue Number	8
Journal	Chemical Science
DOI	10.1039/c6sc00006a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Infrared spectroscopy Amorphous carbon Fluorescence Nanomaterials Ion DFO Ultraviolet Raman spectroscopy Carbon Deferoxamine Carbon nanotube Siderophore Graphene Graphite Chelation Raman
Content Type	Text
Resource Type	Article
Subject	Chemistry

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