Covalently bonded three-dimensional carbon nanotube solids via boron induced nanojunctions.
Covalently bonded three-dimensional carbon nanotube solids via boron induced nanojunctions.
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DOI：
10.1038/srep00363
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发表时间：
2012
影响因子：
4.6
通讯作者：
Ajayan, Pulickel M.
中科院分区：
文献类型：
--
作者：
Hashim, Daniel P.;Narayanan, Narayanan T.;Romo-Herrera, Jose M.;Cullen, David A.;Hahm, Myung Gwan;Lezzi, Peter;Suttle, Joseph R.;Kelkhoff, Doug;Munoz-Sandoval, E.;Ganguli, Sabyasachi;Roy, Ajit K.;Smith, David J.;Vajtai, Robert;Sumpter, Bobby G.;Meunier, Vincent;Terrones, Humberto;Terrones, Mauricio;Ajayan, Pulickel M.
在碳纳米管（CNTs）之间建立共价键和改变其直管状形态是成功合成具有优异材料性能的纳米管三维（3D）框架所需的两种策略。在可扩展的合成工艺中设计这种3D结构仍然是一个挑战。这项工作开创了在化学气相沉积过程中直接通过硼掺杂策略合成三维宏观纳米管弹性固体的先驱，这影响了原子尺度“肘”结和纳米管共价互连的形成。详细的元素分析表明，“肘形”结是多余硼原子的首选位置，表明硼和曲率在结形成机制中的作用，与我们的第一原理理论计算一致。利用这种材料的超轻、超疏水性、高孔隙率、热稳定性和机械柔韧性，这种强亲油性海绵状固体被证明是一种独特的可重复使用的吸附剂支架，即使重复使用也能有效地去除污染海水中的油。
The establishment of covalent junctions between carbon nanotubes (CNTs) and the modification of their straight tubular morphology are two strategies needed to successfully synthesize nanotube-based three-dimensional (3D) frameworks exhibiting superior material properties. Engineering such 3D structures in scalable synthetic processes still remains a challenge. This work pioneers the bulk synthesis of 3D macroscale nanotube elastic solids directly via a boron-doping strategy during chemical vapour deposition, which influences the formation of atomic-scale “elbow” junctions and nanotube covalent interconnections. Detailed elemental analysis revealed that the “elbow” junctions are preferred sites for excess boron atoms, indicating the role of boron and curvature in the junction formation mechanism, in agreement with our first principle theoretical calculations. Exploiting this material’s ultra-light weight, super-hydrophobicity, high porosity, thermal stability, and mechanical flexibility, the strongly oleophilic sponge-like solids are demonstrated as unique reusable sorbent scaffolds able to efficiently remove oil from contaminated seawater even after repeated use.
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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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