Bacteriorhodopsin as a superior substitute for hydrazine in chemical reduction of single-layer graphene oxide sheets
Bacteriorhodopsin as a superior substitute for hydrazine in chemical reduction of single-layer graphene oxide sheets
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DOI：
10.1016/j.carbon.2014.09.044
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发表时间：
2015-01-01
期刊：
影响因子：
10.9
通讯作者：
Akhavan, O.
中科院分区：
文献类型：
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作者：
Akhavan, O.
利用细菌视紫红质（bR）分子作为光驱动的质子泵用于单层氧化石墨烯（GO）片的绿色以及有效还原。通过使用聚四氟乙烯膜过滤器在水性环境中将bR分子和石墨烯片彼此分离，以防止它们的直接相互作用（包括bR分子附着到GO上）。尽管使用肼或bR还原GO显示出相似的脱氧水平（基于X射线光电子能谱），但前者导致CAN键的形成，这可以显著降低还原片的电导率。通过记录位于SiO2（300 nm）/Si（100）衬底上的两个Au电极之间的片的电流-电压曲线来研究单层石墨烯片的电学特性。发现bR还原的氧化石墨烯（rGO）片的导电性比肼-rGO片的导电性好约一个数量级。bR-rGO片的优异导电性（薄层电阻类似于7.1 × 10（4）X/sq）归因于使用由bR分子泵送的质子的有效脱氧（没有形成任何CAN键）和GO片的石墨结构的更好恢复。(C)2014爱思唯尔有限公司版权所有。
Bacteriorhodopsin (bR) molecules were utilized as light-driven proton pumps for green as well as effective reduction of single-layer graphene oxide (GO) sheets. The bR molecules and graphene sheets were separated from each other in an aqueous environment by using a polytetrafluoroethylene membrane filter, in order to prevent their direct interactions (including attachment of the bR molecules onto the GO). Although reduction of GO using hydrazine or bR showed similar deoxygenation levels (based on X-ray photoelectron spectroscopy), the former resulted in formation of CAN bonds which can substantially decrease the electrical conductivity of the reduced sheets. The electrical characteristics of the single-layer graphene sheets were studied by recording current-voltage curves of the sheets located between two Au electrodes on a SiO2 (300 nm)/Si (100) substrate. The electrical conductivity of the bR-reduced graphene oxide (rGO) sheets was found about one order of magnitude better than that of hydrazine-rGO sheets. The excellent electrical conductivity of the bR-rGO sheets (with sheet resistance of similar to 7.1 x 10(4) X/sq) was assigned to the effective deoxygenation (without formation of any CAN bonds) and better restoration of the graphitic structure of the GO sheets, using the protons pumped by the bR molecules. (C) 2014 Elsevier Ltd. All rights reserved.