当前位置: X-MOL 学术J. Am. Chem. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Host–Guest Molecular Interaction Enabled Separation of Large-Diameter Semiconducting Single-Walled Carbon Nanotubes
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-06-09 , DOI: 10.1021/jacs.1c02245
Xusheng Yang 1 , Tianhui Liu 1 , Ruoming Li 2 , Xiaoxin Yang 3 , Min Lyu 2 , Li Fang 4 , Lei Zhang 1 , Kun Wang 1 , Anquan Zhu 1 , Luyao Zhang 1 , Chenguang Qiu 4 , Yuan-Zhu Zhang 1 , Xiao Wang 3 , Lian-Mao Peng 4 , Feng Yang 1 , Yan Li 2, 5, 6
Affiliation  

Semiconducting single-walled carbon nanotubes (s-SWCNTs) with a diameter of around 1.0–1.5 nm, which present bandgaps comparable to silicon, are highly desired for electronic applications. Therefore, the preparation of s-SWCNTs of such diameters has been attracting great attention. The inner surface of SWCNTs has a suitable curvature and large contacting area, which is attractive in host–guest chemistry triggered by electron transfer. Here we reported a strategy of host–guest molecular interaction between SWCNTs and inner clusters with designed size, thus selectively separating s-SWCNTs of expected diameters. When polyoxometalate clusters of ∼1 nm in size were filled in the inner cavities of SWCNTs, s-SWCNTs with diameters concentrated at ∼1.3–1.4 nm were selectively extracted with the purity of ∼98% by a commercially available polyfluorene derivative. The field-effect transistors built from the sorted s-SWCNTs showed a typical behavior of semiconductors. The sorting mechanisms associated with size-dependent electron transfer from nanotubes to inner polyoxometalate were revealed by the spectroscopic and in situ electron microscopic evidence as well as the theoretical calculation. The polyoxometalates with designable size and redox property enable the flexible regulation of interaction between the nanotubes and the clusters, thus tuning the diameter of sorted s-SWCNTs. The present sorting strategy is simple and should be generally feasible in other SWCNT sorting techniques, bringing both great easiness in dispersant design and improved selectivity.

中文翻译:

主客体分子相互作用实现大直径半导体单壁碳纳米管的分离

直径约为 1.0-1.5 nm 的半导体单壁碳纳米管 (s-SWCNT) 具有与硅相当的带隙,在电子应用中非常受欢迎。因此,这种直径的s-SWCNTs的制备受到了极大的关注。SWCNTs的内表面具有合适的曲率和大的接触面积,这在由电子转移引发的主客体化学中很有吸引力。在这里,我们报告了 SWCNT 和具有设计尺寸的内部簇之间的主客体分子相互作用的策略,从而选择性地分离了预期直径的 s-SWCNT。当约 1 nm 的多金属氧酸盐簇填充在 SWCNT 的内腔中时,s-SWCNT 的直径集中在约 1.3-1。通过市售的聚芴衍生物选择性提取 4 nm,纯度约为 98%。由排序的 s-SWCNT 构建的场效应晶体管显示出半导体的典型行为。通过光谱和光谱揭示了与从纳米管到内部多金属氧酸盐的尺寸依赖性电子转移相关的分​​选机制。原位电子显微镜证据以及理论计算。具有可设计尺寸和氧化还原特性的多金属氧酸盐能够灵活调节纳米管和簇之间的相互作用,从而调整分选的 s-SWCNT 的直径。目前的分选策略很简单,在其他单壁碳纳米管分选技术中应该是普遍可行的,在分散剂设计方面带来了极大的便利,并提高了选择性。
更新日期:2021-07-14
down
wechat
bug