Electrical properties of diamond surfaces functionalized with molecular monolayers

被引:60
作者
Tse, KY
Nichols, BM
Yang, WS
Butler, JE
Russell, JN
Hamers, RJ
机构
[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
[2] USN, Res Lab, Div Chem, Washington, DC 20375 USA
关键词
D O I
10.1021/jp046433w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Recent studies have shown that semiconductor surfaces such as silicon and diamond can be functionalized with organic monolayers, and that these monolayer films can be used to tether biomolecules such as DNA to the surfaces. Electrical measurements of these interfaces show a change in response to DNA hybridization and other biological binding processes, but the fundamental nature of the electrical signal transduction has remained unclear. We have explored the electrical impedance of polycrystalline and single-crystal diamond surfaces modified with an organic monolayer produced by photochemical reaction of diamond with 1-dodecene. Our results show that, by measuring the impedance as a function of frequency and potential, it is possible to dissect the complex interfacial structure into frequency ranges where the total impedance is controlled by the molecular monolayer, by the diamond space-charge region, and by the electrolyte. The results have implications for understanding the ability to use molecularly modified semiconductor surfaces for applications such as chemical and biological sensing.
引用
收藏
页码:8523 / 8532
页数:10
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