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Biogenic Synthesis of Tunable Core–Shell C-CaIn2O4, Interface Bonding, Conductive Network Channels, and Tailored Dielectric Properties
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2018-10-16 00:00:00 , DOI: 10.1021/acssuschemeng.8b03197
B. Tiwari 1 , S. Ram 1 , P. Banerji 1
Affiliation  

A green aloe-vera gel contains small tissues (as capillaries), which easily upload Ca2+/In3+ species (upon adding in a solution) so as to form a hybrid complex and conduct a local carbothermic reaction (on heating) in the capillaries, forming a nanohybrid C-CaIn2O4, small core–shells of a tunable carbon-shell of a few molecular layers. Thin C-CaIn2O4 plates (15–20 nm thickness) thus were grown preferentially in (200) facets in a tetragonal crystal structure on a mixed gel which was burnt in camphor in air. The shell thickness was thermally etched down, δ = 3 → 0.5 nm, by post-heating at 400–600 °C in air. It finely tailors dielectric properties on account of interfaces, conducting networks, multiple surfaces, and O2– vacancies/twins (induced in a deoxidizing carbon) with effectively enhanced “e–h+” ion pairs useful for supercapacitors and other devices. In a proposed model, the CaIn2O4 bonds over C-sp2 via O2– in polygons in a network of a 2D-interface Ca2+/In3+–O–C (δ ≥ 0.5 nm), which, when heating, exists (≤1% mass) well up to 600 °C in air. A regular monolayer is very critical for feeding a huge dielectric permittivity εr(s) ∼ 6.9 × 106 on a moderate conductivity σdc ≤ 0.8 × 10–4 S·cm–1 at frequency ω → 0. After relaxing rapidly, a fairly steady εr = 7.6 × 103 lasts of yet a usefully large value over ω ≥ 102 Hz. A wide plateau spans in a steady σac ∼ 0.8 × 10–4 S·cm–1 over ω ≤ 103 Hz, before booting it up progressively by nearly two orders on higher ω in a frequency modulated ionic conductor. The “e–h+” pairs in a conductive network govern the conduction process over uneven and dynamic potential wells. A network as disrupts in thicker shells no longer feeds such large εr values.

中文翻译:

可调谐核-壳C-CaIn 2 O 4的生物合成,界面键合,导电网络通道和量身定制的介电性能

绿色芦荟凝胶含有小的组织(作为毛细血管),可以很容易地上载Ca 2+ / In 3+物种(在溶液中添加),从而形成杂化复合物并在水中进行局部碳热反应(加热时)。毛细管,形成纳米混合C-CaIn 2 O 4,是几个分子层的可调碳壳的小核壳。薄C-CaIn 2 O 4因此,板(15-20 nm厚度)优先在混合凝胶中以四方晶体结构(200个)刻面生长,该凝胶在空气中在樟脑中燃烧。通过在空气中在400–600°C下进行后加热,可将壳的厚度热蚀刻至δ= 3→0.5 nm。它基于界面,导电网络,多个表面和O 2-空位/孪生子(在脱氧碳中诱导),通过有效增强的对超级电容器和其他设备有用的“ e h + ”离子对,可以精确地调整介电性能。在提出的模型中,CaIn 2 O 4通过O 2–在C-sp 2上键合在二维界面Ca 2+ / In 3+的网络中的多边形中。–O–C(δ≥0.5 nm),加热时在空气中的最高温度为600°C时存在(≤1%质量)。一个普通的单层是用于进给一个巨大的介电常数ε非常关键的- [R(S)〜6.9×10 6上的中等导电率σ直流≤0.8×10 -4 S·厘米-1处的频率ω→0快速放松后,一个相当稳定的εr = 7.6×10 3,在ω≥10 2 Hz的情况下仍保持较大的有用值。在一个稳定的σA宽高原跨度交流〜0.8×10 -4 S·厘米-1以上ω≤10 3Hz,然后在调频离子导体中以较高的ω将其逐步启动近两个数量级。导电网络中的“ e –h + ”对控制不均匀且动态势阱的导电过程。在较厚的壳体中破裂的网络不再提供如此大的εr值。
更新日期:2018-10-16
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