One hundred fold increase in current carrying capacity in a carbon nanotube-copper composite.
One hundred fold increase in current carrying capacity in a carbon nanotube-copper composite.
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DOI：
10.1038/ncomms3202
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发表时间：
2013
影响因子：
16.6
通讯作者：
Hata, Kenji
中科院分区：
文献类型：
--
作者：
Subramaniam, Chandramouli;Yamada, Takeo;Kobashi, Kazufumi;Sekiguchi, Atsuko;Futaba, Don N.;Yumura, Motoo;Hata, Kenji
电子设备的便携性、多功能性和普遍性的增加是其逐渐小型化的结果，需要电流通过狭窄的通道。目前的设备接近导体（如铜和金）的最大载流容量（即载流量）运行，导致寿命和性能下降，从而产生了对具有更高载流量的新导体的需求。载流量表示物体的最大载流能力，取决于结构和材料。在这里，我们报告了一种碳纳米管-铜复合材料，其电导率（2.3-4.7 × 105 S cm −1）与铜（5.8 × 105 S cm −1）相似，但载流量（6 × 108 A cm−2）高出100倍。真空实验表明，碳纳米管抑制铜中的主要失效途径，如通过在碳纳米管-铜复合物中增加的铜扩散激活能（1.2eV）所观察到的，解释了其较高的载流量。这是唯一同时具有高导电性和高载流量的材料，使其特别适合微型电子和逆变器应用。 高电导率和载流量通常是相互排斥的特性。在这里，在碳纳米管-铜复合材料中，Subramaniam等人实现了与铜相似的导电性，但载流量增加了一百倍。
Increased portability, versatility and ubiquity of electronics devices are a result of their progressive miniaturization, requiring current flow through narrow channels. Present-day devices operate close to the maximum current-carrying-capacity (that is, ampacity) of conductors (such as copper and gold), leading to decreased lifetime and performance, creating demand for new conductors with higher ampacity. Ampacity represents the maximum current-carrying capacity of the object that depends both on the structure and material. Here we report a carbon nanotube–copper composite exhibiting similar conductivity (2.3–4.7 × 105 S cm−1) as copper (5.8 × 105 S cm−1), but with a 100-times higher ampacity (6 × 108 A cm−2). Vacuum experiments demonstrate that carbon nanotubes suppress the primary failure pathways in copper as observed by the increased copper diffusion activation energy (∼2.0 eV) in carbon nanotube–copper composite, explaining its higher ampacity. This is the only material with both high conductivity and high ampacity, making it uniquely suited for applications in microscale electronics and inverters. High electrical conductivity and ampacity are usually mutually exclusive properties. Here, in a carbon nanotube–copper composite, Subramaniam et al. achieve a similar conductivity to copper, but with a hundred fold increase in current carrying capacity.
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影响因子：
20.6
作者：
BLACK, JR
通讯作者：
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影响因子：
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作者：
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通讯作者：
BLACK, JR