Self-organization of amorphous Q-carbon and Q-BN nanoballs
Self-organization of amorphous Q-carbon and Q-BN nanoballs
复制标题
无定形Q-carbon和Q-BN纳米球的自组织
DOI：
10.1016/j.carbon.2022.03.003
复制
发表时间：
2022
期刊：
影响因子：
10.9
通讯作者：
Khosla, N.
中科院分区：
文献类型：
--
作者：
Narayan, J.;Khosla, N.
本文首次报道了非晶Q-C和Q-BN纳米球的形成和自组织。这是通过分别在高度过冷状态下对碳和BN层进行纳秒激光熔化并随后在常压下在空气中快速冷却来实现的。这些具有均匀尺寸的Q-碳和Q-BN纳米球的尺寸可以从5到100 nm变化，并且通过操纵激光、碳膜和衬底参数沿着环和串自组织。据设想，自组织是由过冷度促进的，并且它沿着弦和环发生，所述弦和环分别由在和方向上的四面体排列形成<100><110>。通过HRSEM/TEM/STEM/EELS和拉曼表征这些纳米球以确认相纯度和键合特性。Q-碳球在纯态和未掺杂态下均表现出强的铁磁性和场发射，并且在掺杂硼后表现出最高的BCS超导转变温度。Q碳球的铁磁性可以随尺寸变化，并获得比薄膜更高的磁性，这些球可以被药物包裹用于靶向递送。鉴于这些特性，纳米球有望找到新的应用，从靶向递送到纳米传感和超导量子比特。
This paper reports for the first time the formation and self-organization of amorphous Q-carbon and Q-BN nanoballs. This is accomplished by nanosecond laser melting of carbon and BN layers, respectively, in a highly undercooled state and subsequent rapid cooling at normal pressures in air. The size of these Q-carbon and Q-BN nanoballs having a uniform size can be varied from 5 to 100 nm, and self-organized along rings and strings by manipulating laser, carbon film, and substrate parameters. It is envisaged that self-organization is promoted by the undercooling and it occurs along strings and rings, which are formed by the tetrahedral alignment in <100> and <110> directions, respectively. These nanoballs were characterized by HRSEM/TEM/STEM/EELS and Raman to confirm the phase purity and bonding characteristics. The Q-carbon balls exhibit robust ferromagnetism and field emission in pure and undoped form and show highest BCS superconducting transition temperature upon doping with boron. The ferromagnetism in Q-carbon balls can be varied with size and achieve higher coercively than thin films, and these balls can be coated with drugs for targeted delivery. In view of these properties, nanoballs are expected to find novel applications ranging from targeted delivery to nanosensing and superconducting qubits.
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影响因子：
10.9
作者：
J. Narayan;A. Bhaumik;Siddharth Gupta;P. Joshi;P. Riley;R. Narayan
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：
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DOI：
--
发表时间：
2018
期刊：
影响因子：
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作者：
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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：
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影响因子：
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作者：
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通讯作者：
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