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Large unsaturated room temperature negative magnetoresistance in graphene foam composite for wearable and flexible magnetoelectronics
Nano Research ( IF 9.9 ) Pub Date : 2018-09-11 , DOI: 10.1007/s12274-018-2186-6
Rizwan Ur Rehman Sagar , Massimiliano Galluzzi , Alberto García-Peñas , Masroor Ahmad Bhat , Min Zhang , Florian J. Stadler

Room temperature positive magnetoresistance (PMR) in graphene is a conventional phenomenon but we observed large negative magnetoresistance (NMR) in GF/polydimethylsiloxane (GF/PDMS) at room temperature for the first time. The largest NMR ~ 35% was detected at 250 K, while PMR is observed below 200 K. Furthermore, PMR at all temperatures is observed in regular GF specimens, hence, NMR is the result of the infiltration with the electrically insulating polymer. Forward interference and wavefunction shrinkage model has been employed to understand the transport mechanism in GF/PDMS. A critical temperature ~ 224 K for switching between NMR and PMR is observed at the crystallization temperature of PDMS, suggesting a change in polymer chain conformation may be a major reason leading to NMR in GF/PDMS specimens thus role of mechanical properties of PDMS in NMR cannot be ignored and observed locally via specially resolved atomic force microscopy. In addition, storage modulus and heat flow study shows similar transition temperature (~ 200 K) of NMR to PMR and provide an evidence of mechanical stable specimens. As is known, large, tunable, and unsaturated NMR at room temperature is very useful for future facile practical shapeable magnetoelectronic devices.

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中文翻译:

用于耐磨和柔性磁电子学的石墨烯泡沫复合材料中的大型不饱和室温负磁阻

石墨烯在室温下的正磁阻(PMR)是一种常规现象,但是我们首次在室温下观察到GF /聚二甲基硅氧烷(GF / PDMS)的大负磁阻(NMR)。在250 K下检测到最大NMR〜35%,而在200 K以下观察到PMR。此外,在常规GF样品中在所有温度下均观察到PMR,因此NMR是电绝缘聚合物渗透的结果。前向干扰和波函数收缩模型已被用来了解GF / PDMS中的传输机制。在PDMS的结晶温度下,观察到在NMR和PMR之间切换的临界温度〜224 K,提示聚合物链构象的变化可能是导致GF / PDMS标本中产生NMR的主要原因,因此PDMS的机械性能在NMR中的作用不容忽视,并且可以通过专门解析的原子力显微镜进行局部观察。此外,储能模量和热流研究表明NMR的转变温度(〜200 K)与PMR相似,并提供了机械稳定标本的证据。众所周知,在室温下大的,可调谐的和不饱和的NMR对于将来的实用的可成形磁电子器件非常有用。

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更新日期:2018-09-11
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