• 文献标题:   Probing the Structure of Water at the Interface with Graphene Oxide Using Sum Frequency Generation Vibrational Spectroscopy
  • 文献类型:   Article
  • 作  者:   HONG YM, HE JL, ZHANG CY, WANG XP
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF PHYSICAL CHEMISTRY C
  • ISSN:   1932-7447 EI 1932-7455
  • 通讯作者地址:  
  • 被引频次:   6
  • DOI:   10.1021/acs.jpcc.1c08328 EA DEC 2021
  • 出版年:   2022

▎ 摘  要

The structure of water at the graphene oxide (GO)/water interface has received considerable attention due to the high performance of GO in a wide number of applications. In this work, a face-up geometry of sum frequency generation (SFG) vibrational spectroscopy was employed to deduce the structure of water at the GO/water interface in which GO nanosheets were covered onto the water surface via Langmuir compression. The SFG results showed that the intense OH stretching bands at the range of 3000-3600 cm(-1) were predominant in the spectrum with high GO coverage, which is mainly due to the third-order susceptibility chi((3)) response from the water orientation in the electrical double layer induced by the static electric field of the negatively charged GO surface. In addition, the second-order susceptibility chi((2)) response was relatively weak, suggesting that a few water molecules formed a H-bonding network within the closest GO surface. This work is beneficial to the in-depth understanding of water in contact with GO-based materials.