Multi-Frequency EPR and DC Conductivity of Itinerant Spins in Single-Wall Carbon Nanotubes

Multi-Frequency EPR and DC Conductivity of Itinerant Spins in Single-Wall Carbon Nanotubes
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单壁碳纳米管中巡回自旋的多频 EPR 和直流电导率

DOI:
10.1007/s00723-009-0084-5
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发表时间:
2010
影响因子:
1
通讯作者:
B. Corziliu
B. Corziliu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
K.-P. Dinse;J. van Tol;A. Ozarowski;B. Corziliu

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密封脱氧单壁碳纳米管在300 ~ 50 K温度范围内表现出两个特征电子顺磁共振信号atg= 2.07和g= 2.00。观察到两组分之间的可逆相互转换。g= 2.07信号的EPR磁化率的大位移和温度依赖性表明该信号可能是由自旋引起的。在低温下,仅保留了2.00信号,可以使用高达320 GHz的微波频率进一步表征。还测量了部分对准样品的直流电导率。室内温度值估计为0.7 (Ωcm)−1。观察到的温度依赖性可以通过假设激活能为3.5 meV的小间隙半导体中的温度激活跳变来描述,类似于先前测量的9.4 GHz微波电导率的特征。
Sealed, deoxygenated single-wall carbon nanotubes show two characteristic electron paramagnetic resonance (EPR) signals atg= 2.07 andg= 2.00 in the temperature range from 300 to 50 K. Reversible interconversion between both components was observed. The largeg-shift and the temperature dependence of the EPR susceptibility of theg= 2.07 signal indicate that this signal can be attributed to itinerant spins. At low temperatures only theg= 2.00 signal remained, which could be further characterized using microwave frequencies up to 320 GHz. The direct current conductivity of a partially aligned sample was also measured. The room temperature value was estimated as 0.7 (Ωcm)−1. The observed temperature dependence can be described by assuming temperature-activated hopping in a small-gap semiconductor with an activation energy of 3.5 meV, similar to the characteristics of the previously measured 9.4 GHz microwave conductivity.
DOI: 10.1039/b707936m
发表时间: 2007-11
期刊: Physical chemistry chemical physics : PCCP
影响因子: --
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