Covalent Modification of Highly Ordered Pyrolytic Graphite with a Stable Organic Free Radical by Using Diazonium Chemistry
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- 作者：Dr. Gonca Seber ; Dr. Alexander V. Rudnev ; Dr. Andrea Droghetti ; Dr. Ivan Rungger ; Prof. Jaume Veciana ; Dr. Marta Mas-Torrent ; Prof. Concepció ; Rovira and Dr. Nú ; ria Crivillers
- 刊名：Chemistry - A European Journal
- 出版年：2017
- 出版时间：January 26, 2017
- 年：2017
- 卷：23
- 期：6
- 页码：1415-1421
- 全文大小：2040K
- ISSN：1521-3765
文摘
A novel, persistent, electrochemically active perchlorinated triphenylmethyl (PTM) radical with a diazonium functionality has been covalently attached to highly ordered pyrolytic graphite (HOPG) by electrografting in a single-step process. Electrochemical scanning tunneling microscopy (EC-STM) and Raman spectroscopy measurements revealed that PTM molecules had a higher tendency to covalently react at the HOPG step edges. The cross-section profiles from EC-STM images showed that there was current enhancement at the functionalized areas, which could be explained by redox-mediated electron tunneling through surface-confined redox-active molecules. Cyclic voltammetry clearly demonstrated that the intrinsic properties of the organic radical were preserved upon grafting and DFT calculations also revealed that the magnetic character of the PTM radical was preserved.