Tannic Acid‑A Universal Immobilization and Fixation Agent for Nanocarbon Materials: A Novel Strategy for Aqueous Fabrication of Functional Nanocarbon Coating onto Silicon-Based Substances
Tannic Acid‑A Universal Immobilization and Fixation Agent for Nanocarbon Materials: A Novel Strategy for Aqueous Fabrication of Functional Nanocarbon Coating onto Silicon-Based Substances
复制标题
单宁酸——纳米碳材料的通用固定剂：在硅基物质上水相制备功能性纳米碳涂层的新策略
DOI：
10.1021/acssuschemeng.9b04623
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发表时间：
2019
影响因子：
8.4
通讯作者：
Li Kai
中科院分区：
文献类型：
--
作者：
Zhou Hongpo;Zhou Yang;Xu Juan;Liu Lanxiang;Ma Jinju;Zhang Wenwen;Li Kun;Zhang Hong;Li Kai
我们报告了一种可行的和通用的方法来制造纳米碳材料（NCM）涂层到广泛的硅基物质。单宁酸（TA）分子中的酚羟基和星形支化结构使其可以作为功能性试剂在水相中固定化和固定化纳米材料。更具体地说，操纵分子动力学模拟验证了一些未电离的TA链可以紧密地附着在中性水环境中的NCM的表面通过π-π堆积相互作用，和其他自由臂与电离的酚羟基可以作为表面电荷的TA/NCM凝聚，导致这种分散体的胶体稳定性增强。随后，这些自由臂也可以与胺化的硅基物质相互作用，使TA能够充当NCM和硅基物质之间的“桥梁”，以形成纳米碳涂层。在循环压缩-释放测试中，TA/NCM涂层的聚二甲基硅氧烷表现出良好的导电性和导热性，沿着具有优异的机电性能。这种方法对NCM层和器件的制备是一个很大的改进，它不需要对NCM进行亲水改性，有利于增强碳层与基底之间的相互作用，避免涂层与物质的分离。
We report a feasible and universal approach to fabricate nanocarbon material (NCM) coatings onto a wide range of silicon-based substances. Benefitting from the phenolic hydroxyl and star-shaped branched molecular structure, tannic acid (TA) could act as a functional agent for immobilization and fixation of NCMs in the aqueous phase. More specifically, steered molecular dynamics simulations verified that some unionized chains of TA could tightly attach to the NCM’s surface in the neutral aqueous environment by π–π stacking interactions, and other free arms with ionized phenolic hydroxyl could act as surface charges of the TA/NCM coacervates, resulting in enhanced colloidal stability of this dispersion. Subsequently, these free arms could also interact with the aminated silicon-based substances, enabling TA to act as a “bridge” between the NCM and the silicon-based substances to form the nanocarbon coating. The obtained polydimethylsiloxane with TA/NCM coating represents favorable electrical and thermal conductivity along with excellent electromechanical performance under the cyclic compression-release test. This strategy is a great improvement for the fabrication of NCM layers and devices, which is not necessary to make the hydrophilic modification of NCM and beneficial to enhance the interaction between the carbon layer and substrate, avoiding the coating separation from the substances.