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大气物种对功能化石墨烯片电学性质的影响。

Influence of atmospheric species on the electrical properties of functionalized graphene sheets.

作者信息

Bekdüz Bilge, Kampermann Laura, Mertin Wolfgang, Punckt Christian, Aksay Ilhan A, Bacher Gerd

机构信息

Werkstoffe der Elektrotechnik, CENIDE, Universität Duisburg-Essen 47057 Duisburg Germany

Department of Chemical and Biological Engineering, Princeton University Princeton New Jersey 08544 USA.

出版信息

RSC Adv. 2018 Dec 18;8(73):42073-42079. doi: 10.1039/c8ra08227h. eCollection 2018 Dec 12.

DOI:10.1039/c8ra08227h
PMID:35558770
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9092110/
Abstract

We report on the time-dependent influence of atmospheric species on the electrical properties of functionalized graphene sheets (FGSs). When exposed to laboratory air, FGSs exhibit a significant, irreversible decrease in electrical conductance with time, strongly depending on the oxygen content of the FGSs. To separate the roles of charge carrier density and mobility in this aging process, we performed electron transport measurements using a back-gate field-effect transistor architecture. Investigating the position of the Dirac point under different atmospheres, we found that adsorbed atmospheric species result in pronounced p-doping, which - on a short time scale - can be reversed under nitrogen atmosphere. However, on a time scale of several days, the resistance increases irreversibly, while the Dirac point voltage remains constant. From these experiments, we conclude that the aging of FGSs is related to the chemisorption of atmospheric species leading to enhanced carrier scattering due to an increasing amount of sp- regions and thus to a reduced charge carrier mobility.

摘要

我们报告了大气成分对功能化石墨烯片（FGSs）电学性质的时间依赖性影响。当暴露于实验室空气中时，FGSs的电导会随时间显著且不可逆地降低，这强烈依赖于FGSs的氧含量。为了区分电荷载流子密度和迁移率在这个老化过程中的作用，我们使用背栅场效应晶体管结构进行了电子输运测量。通过研究不同气氛下狄拉克点的位置，我们发现吸附的大气成分会导致明显的p型掺杂，在短时间尺度上，这种掺杂在氮气气氛下可以逆转。然而，在几天的时间尺度上，电阻会不可逆地增加，而狄拉克点电压保持不变。从这些实验中，我们得出结论，FGSs的老化与大气成分的化学吸附有关，由于sp区域数量增加，导致载流子散射增强，从而使电荷载流子迁移率降低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/d88e0cf5c109/c8ra08227h-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/5db3398c6ac7/c8ra08227h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/de20618cd363/c8ra08227h-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/725430ee2855/c8ra08227h-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/552bdd74730c/c8ra08227h-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/d88e0cf5c109/c8ra08227h-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/5db3398c6ac7/c8ra08227h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/de20618cd363/c8ra08227h-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/725430ee2855/c8ra08227h-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/552bdd74730c/c8ra08227h-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd82/9092110/d88e0cf5c109/c8ra08227h-f5.jpg

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