期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 15, 页码 13211-13217出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01219
关键词
noncovalent immobilization; interfacial electron transfer; indium tin oxide; pyrene; chemically modified electrode
资金
- Hellman Faculty Fellows Fund
- School of Physical Sciences at UC Irvine
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0012150]
- National Science Foundation Major Research Instrumentation Program [CHE-1338173]
- National Institutes of Health [2P41GM103540]
- UCI [2P41GM103540]
The immobilization of molecular species onto electrodes presents a direct route to modifying surface properties with molecular fidelity. Conventional methods indude direct covalent attachment and physisorption of pyrene-appended molecular compounds to electrodes with aromatic character through pi-pi interactions. A recently reported hybrid approach extends the synthetic flexibility of the latter to a broader range of electrode materials. We report an application of this approach to immobilization of pyrene-appended ferrocene onto pyrene-functionalized indium tin oxide (ITO). The modified ITO surfaces were characterized using Xray photoelectron spectroscopy, fluorescence spectroscopy, and electrochemical techniques. An electron -transfer rate constant (kappa(app)) of 100 +/- 8 s(-1) was measured between the electrode and immobilized ferrocene using electrochemical methods. For comparison, a ferrocene-modified electrode using conventional covalent attachment of vinylferrocene was also prepared, and kappa(app) was measured to be 9 +/- 2 s(-1).
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