Covalent transfer of chemical gradients onto a graphenic surface with 2D and 3D control

Abstract

Control over the functionalization of graphenic materials is key to enable their full application in electronic and optical technologies. Covalent functionalization strategies have been proposed as an approach to tailor the interfaces’ structure and properties. However, to date, none of the proposed methods allow for a covalent functionalization with control over the grafting density, layer thickness and/or morphology, which are key aspects for fine-tuning the processability and performance of graphenic materials. Here, we show that the no-slip boundary condition at the walls of a continuous flow microfluidic device offers a way to generate controlled chemical gradients onto a graphenic material with 2D and 3D control, a possibility that will allow the sophisticated functionalization of these technologically-relevant materials.

二维原子-分子异质结的制备及其类脑器件应用

“…(e) Photoinduced resistance modulation of functionalized 1L and 2L graphene and non-functionalized graphene devices [201] (color online). (2) 共价修饰依旧无法实现精确的位置修饰, 修饰 位点和数量的不可控会导致批次间性能的极大差 异 [115] , 在图案化上也同样存在问题; (3) 2DAMH所依…”

“…仍存在一定挑战, 但目前也有许多研究致力于解决共 价修饰存在的技术缺陷. 例如, 结合传统异质结和 2DAMH的优点, 通过在维持物理接触的基础上实施 共价连接 [205] , 以期望实现更大的性能提升和协同效 应; 或利用先进技术如光刻、微流控 [115] 等加工手段, 采取同步剥离/修饰 [189] 、选择性修饰 [71,142,199] 、多层 材料修饰 [201] 、形成配位键等化学吸附非伤害性成 键 [99] 的共价化学修饰衍生物合成策略以提高材料合 成精度; 而基于性能优越、表面光滑的2DAMH修饰 基 团 覆 盖 率 也 可 以 作 为 衡 量 改 性 效 果 的 重 要 指 标 [98,104] , 这将对于实现未来的精确化修饰具有重要意 义. 综上所述, 2DAMH为类脑计算器件单元的发展开…”

Flow-driven enhancement of neodymium and dysprosium separation from aqueous solutions

“…A simple strategy for non-equilibrium selective crystallization is altering ow conditions and using laminar co-ow of reactants to create signicantly different ion concentration proles at the liquid/liquid interface compared with bulk stirred mixing (i.e., equilibrium conditions). This ow-induced non-equilibrium method has been previously used to investigate materials synthesis, [29][30][31][32] crystal growth, [33][34][35] and origins of life at submarine hydrothermal vents. [36][37][38] In our recent work, we reported the use of a laminar co-ow method (LCM) for selective precipitation of Mg 2+ from natural seawater.…”

“…, equilibrium conditions). This flow-induced non-equilibrium method has been previously used to investigate materials synthesis, 29–32 crystal growth, 33–35 and origins of life at submarine hydrothermal vents. 36–38…”

Spatially Controlled Aryl Radical Grafting of Graphite Surfaces Guided by Self-Assembled Molecular Networks of Linear Alkane Derivatives: The Importance of Conformational Dynamics

“…Spatial control in the aryl radical grafting of graphitic surfaces at the micrometer level was reported by the use of scanning electrochemical cell microscopy, microfluidics devices, , and a mask produced by E-beam lithography . Downscaling to several hundred nanometer scale was achieved using self-assembled monolayers of polystyrene beads as masks, producing a covalently grafted surface with disk-like pristine areas, or so-called “nanocorrals” with a diameter of ca.…”