Current-Voltage Characteristics and Transition Voltage Spectroscopy of Individual Redox Proteins

被引：47

作者：

Artes, Juan M. ^{[1
]}

Lopez-Martinez, Montserrat ^{[1
]}

Giraudet, Arnaud ^{[1
]}

Diez-Perez, Ismael ^{[1
,2
]}

Sanz, Fausto ^{[1
,2
,3
]}

Gorostiza, Pau ^{[1
,3
,4
]}

机构：

[1] Inst Bioengn Catalonia IBEC, Barcelona 08028, Spain

[2] Univ Barcelona, Dept Phys Chem, E-08028 Barcelona, Spain

[3] Networking Res Ctr Bioengn Biomat & Nanomed CIBER, Zaragoza 50018, Spain

[4] Catalan Inst Res & Adv Studies ICREA, Barcelona 08010, Spain

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 50期

关键词：

SCANNING-TUNNELING-MICROSCOPY; RANGE ELECTRON-TRANSFER; ELECTROCHEMICAL STM; DOUBLE-LAYER; JUNCTIONS; DISTANCE; MECHANISMS; TRANSPORT;

D O I：

10.1021/ja3080242

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Understanding how molecular conductance depends on voltage is essential for characterizing molecular electronics devices. We reproducibly measured current-voltage characteristics of individual redox-active proteins by scanning tunneling microscopy under potentiostatic control in both tunneling and wired configurations. From these results, transition voltage spectroscopy (TVS) data for individual redox molecules can be calculated and analyzed statistically, adding a new dimension to conductance measurements. The transition voltage (TV) is discussed in terms of the two-step electron transfer (ET) mechanism. Azurin displays the lowest TV measured to date (0.4 V), consistent with the previously reported distance decay factor. This low TV may be advantageous for fabricating and operating molecular electronic devices for different applications. Our measurements show that TVS is a helpful tool for single-molecule ET measurements and suggest a mechanism for gating of ET between partner redox proteins.

引用

页码：20218 / 20221

页数：4

共 36 条

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