Functional carbon nanomembranes and graphene from aromatic molecules
讲座名称：
Functional carbon nanomembranes and graphene from aromatic molecules
讲座时间：
2015-10-26
讲座人：
张向辉
形式：
校区：
兴庆校区
实践学分：
讲座内容：
报告题目：Functional carbon nanomembranes and graphene from aromatic molecules
报告人：张向辉
报告地点：中1-3113
报告时间：10月26号(周一)下午4:10-6:00PM
Abstract:
We report an original approach to fabricate 1 nm thick carbon nanomembranes (CNMs) and graphene from aromatic self-assembled monolayers (SAMs).[1] This approach is based on the low-energy electron-radiation induced crosslinking of aromatic SAMs, and a subsequent annealing leads to the conversion of CNMs to graphene with well-defined thickness and dimensions. Freestanding CNMs can be further chemically functionalized on both sides. The mechanical properties of CNMs were investigated using AFM bulge testing and interferometric method. [2] We found a correlation between the rigidity of the precursor molecules and the macroscopic mechanical stiffness of CNMs from densely packed SAMs. [3] Elastic modulus of graphene prepared via annealing CNMs increases with increasing annealing temperatures, [4] which is accompanied by changes in electrical conductivity and electron mobility. Gas permeation measurements of CNMs supported by a polymeric membrane were carried out with a constant volume, variable pressure experimental setup. The deposition of CNMs reduces the gas permeation of PDMS membrane dramatically and a different gas permeation mechanism for single-layer and trilayer CNMs is also revealed.[5] We also demonstrated a viable route to integrate two-dimensional (2D) materials like CNMs and graphene with other low-dimensional materials into mechanically stable van der Waals heterostructures,[6] thus aiming at a molecular route to rationally fabricate functional nanomembranes for gas separation and liquid filtration applications.
References:
[1] A. Turchanin, A. Gölzhäuser, Prog. Surf. Sci. 87(2012) 108-162; P. Angelova, H. Vieker, N.E. Weber, D. Matei, et al., ACS nano 7(2013) 6489-97.
[2] X. Zhang, A. Beyer, A. Gölzhäuser, A., Beilstein J Nanotechnol. 2(2011) 826-833; X. Zhang, R. Waitz, F. Yang, C. Lutz, et al., Appl. Phys. Lett. 106(2015) 063107.
[3] X. Zhang, C. Neumann, P. Angelova, A. Beyer, A. Gölzhäuser, Langmuir 30(2014) 8221-8227.
[4] A. Turchanin, A. Beyer, C. T. Nottbohm, X. Zhang, et al., Adv. Mater. 21(2009) 1233-1237.
[5] M. Ai, S. Shishatskiy, J. Wind, X. Zhang, et al., Adv. Mater. 26(2014) 3421-3426.
[6] Z. Zheng, X. Zhang, C. Neumann, D. Emmrich, et al., Nanoscale 7(2015) 13393-13397.
相关视频