Langmuir-Blodgett Assembly of Graphite Oxide Single Layers
Abstract:
摘要：
Single-layer graphite oxide can be viewed as an unconventional type of soft material and has recently been recognized as a promising material for composite and electronics applications.
萧亚轩wow演唱会It is of both scientific curiosity and technical importance to know how these atomically thin sheets assemble.
众所周知，利用原子能组装单层氧化石墨烯在科技创新和工艺方面都是非常重要的。
There are two fundamental geometries of interacting single layers: edge-to-edge and face-to-face.
单层的氧化石墨烯相互作用有两种基本结构，即边对边和面对面。
Such interactions were studied at the air-water interface by Langmuir-Blodgett assembly.
研究氧化石墨烯在空气-水界面上相互作用的组装被称为LB组装。
Stable monolayers of graphite oxide single layers were obtained without the need for any surfactant or stabilizing agent, due to the strong electrostatic repulsion between the 2D confined layers.
由于二维承压层之间有强烈的静电斥力，在获得稳定的单层氧化石墨烯不需要任何表面活性剂和稳定剂。
Such repulsion also prevented the single layers from overlapping during compression, leading to excellent reversibility of the monolayers.
刘强东 庄佳这样的斥力也避免了单一层压缩时重叠，从而得到可逆转的优秀单层。
In contrast to molecular and hard colloidal particle monolayers, the single layers tend to fold and wrinkle at edges to resist collapsing into multilayers.
分子单层与胶体微粒形成明显的对比，单一层的往往在边缘容易折叠形成折皱。
The monolayers can be transferred to a substrate, readily creating a large area of flat graphite oxide single layers.
单层的可以被转移到基底上，很容易组装一片大面积的单层氧化石墨烯膜。
The density of such films can be continuously tuned from dilute, close-packed to overpacked monolayers of interlocking single layers.
这种单片的密度可以从稀疏调整到连续不断，也可将重叠在一起的调整到连续的单层膜。
For size-mismatched single layers, face-to-face interaction caused irreversible stacking, leading to double layers.
对于大小不匹配的单层次，面对面的相互作用造成的不可逆转的叠加，导致双层。
爱在线The graphite oxide monolayers can be chemically reduced to graphene for electronic applications such as transparent conducting thin films.
单层的氧化石墨烯可以用化学的方法转变成石墨烯应用与电子方面，比如制成透明的导电薄膜。
Introduction
引言
1.Graphite oxide (GO) is usually made by reacting graphite powder with strong oxidants such as a mixture of concentrated sulfuric acid and potassium permanganate.
裘德 洛氧化石墨烯通常是由石墨粉与强氧化剂反应制得，例如浓硫酸和高锰酸钾混合溶液。
After oxidation, the carbon sheets are exfoliated and derivatized by carboxylic acid at the edges, or phenol hydroxyl and epoxide groups mainly at the basal plane.
经过氧化，碳片脱落的边缘，或酚羟基和环氧基组主要是在基面的羧酸衍生物。
The reaction breaks the π-π conjugation at those sites, which can be partially recovered by either chemical or thermal methods to yield graphene.
这个反应破坏了π-π键，利用化学或热的方法将其还原成石墨烯。
Recently,GO has rapidly become a promising material for polymer composite and graphene-related electronics applications.
最近，氧化石墨烯作为高分子复合材料和石墨烯有关的电子应用使其迅速成为一种很有前途的材料。
A graphite oxide single layer (GOSL) consists of a hexagonal network of covalently linked carbon atoms with oxygen-containing functional groups attached to various sites (Figure1a,b).
单层的氧化石墨烯（GOSL）是由一个共价键连接的碳原子六边形网络与含氧官能团连接到各个站点组成的（如图1a，b）。
It can be viewed as an unconventional type of soft material in that it is a two-dimensional (2D) membrane-like single polymer molecule that also acts like a colloid.
它可以被看作是一个非传统型软质材料，由于它是一个二维（2D）膜类单聚合物分子即胶体。
The colloidal “particle” is characterized by two abruptly different length scales, with the thickness determined by a single atomic layer and the lateral sheet extending to up to tens of micrometers.
胶体“粒子”的特点是由两个不同尺寸，厚度由单个原子层和横向扩展到几十微米的薄片决定的。
This gives GOSLs a very high aspect ratio and nominal surface area since a single layer is essentially completely surface.
这样给单层的氧化石墨烯一个非常高的长宽比和标称面积，因为单层的是一个完整的表面。一千零一夜下载
It is of both scientific curiosity and technical importance to know how these atomically thin sheets assemble and how they behave when interacting with each other.
懂得如何将这些原子薄片组装及互相作用时如何表征，这在科学的好奇心和技术方面都是非常重要的。
2.The interaction between colloidal particles determines their colloidal stability.
胶体粒子之间的相互作用决定了它们胶状物质的稳定性。
The three classical types of DLVO stability of charged colloidal particles are illustrated in Figure 1f by total energy (U) versus particle separation (d) curves.
三个经典的DLVO理论稳定带电胶体，总能量（u）与粒子间距（d）曲线如图1f所示。（DLVO理论(DLVO theory)一种关于胶体稳定性的理论，是带电胶体溶液理论的经典描述分析。）
A colloidal dispersion is stable if the electrostatic repulsion dominates.
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