Institute for Materials Science and Max Bergmann Center of Biomaterials Dresden University of Technology, D-01062, Dresden, Germany.
Nanoscale. 2012 May 21;4(10):3168-74. doi: 10.1039/c2nr30097d. Epub 2012 Apr 13.
The difficulty in determining the mass of a sample increases as its size diminishes. At the nanoscale, there are no direct methods for resolving the mass of single molecules or nanoparticles and so more sophisticated approaches based on electromechanical phenomena are required. More importantly, one demands that such nanoelectromechanical techniques could provide not only information about the mass of the target molecules but also about their geometrical properties. In this sense, we report a theoretical study that illustrates in detail how graphene membranes can operate as nanoelectromechanical mass-sensor devices. Wide graphene sheets were exposed to different types and amounts of molecules and molecular dynamic simulations were employed to treat these doping processes statistically. We demonstrate that the mass variation effect and information about the graphene-molecule interactions can be inferred through dynamical response functions. Our results confirm the potential use of graphene as a mass detector device with remarkable precision in estimating variations in mass at the molecular scale and other physical properties of the dopants.
随着样本尺寸的减小，确定其质量的难度会增加。在纳米尺度上，没有直接的方法可以确定单个分子或纳米颗粒的质量，因此需要更复杂的基于机电现象的方法。更重要的是，人们要求这种纳米机电技术不仅能够提供有关目标分子质量的信息，还能够提供有关其几何性质的信息。从这个意义上说，我们报告了一项理论研究，详细说明了石墨烯膜如何能够作为纳米机电质量传感器设备运行。将宽的石墨烯片暴露于不同类型和数量的分子，并采用分子动力学模拟对这些掺杂过程进行统计处理。我们证明，通过动态响应函数可以推断出质量变化效应和关于石墨烯-分子相互作用的信息。我们的结果证实了石墨烯作为质量探测器设备的潜在用途，它可以在分子尺度上精确估计质量变化以及掺杂剂的其他物理性质。
