8CB单分子膜-CN伸缩振动的相位及强度高分辨和频振动光谱
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- 英文论文题名：Phase-Resolved and Intensity High-Resolution Sum Frequency Generation Vibrational Spectroscopy of the –CN Stretch in 8CB Monolayer
- 论文作者：陈顺利 ; 付力 ; 干为 ; 王鸿飞
- 英文论文作者：Shun-Li Chen ; Li Fu ; Wei Gan ; Hong-Fei Wang ; Laboratory of Environmental Science and Technology ; Xinjiang Technical Institute of Physics and Chemistry ; Key Laboratory of Functional Materials and Devices for Special Environments ; Chinese Academy of Sciences ; William R. Wiley Environmental Molecular Sciences Laboratory ; Pacific Northwest National Laboratory ; Physical Sciences Division ; Pacific Northwest National Laboratory
- 年：2016
- 作者机构：中国科学院新疆理化技术研究所,中科院特殊环境功能材料与器件重点实验室,环境科学与技术研究室;美国能源部西北太平洋国家实验室,环境分子科学实验室;
- 论文关键词：和频振动光谱 ; 内部外差相位分辨 ; 8CB ; Langmuir-Blodgett膜
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十四分会：化学动力学
- 语种：中文
- 分类号：O641.1;O657.3
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十四分会 ; 化学动力学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：264k
- 原文格式：D
- 会议级别：全国
摘要
和频振动光谱(SFG)技术作为一种独特的具有亚单分子层敏感性的表界面研究工具,已被广泛应用于表界面分子的光谱识别、取向构型分析、超快反应动力学探测。本文基于近期发展起来的高分辨(分辨率<1cm~(-1))和频振动光谱技术~([1]),利用内部外差相位分辨(IHPR)方法~([2,3]),检测了8CB(4-n-octyl-4’-cyanobiphenyl)分子在Z-cutα-石英~([3])、以及SiO_2/Z-cutα-石英表面形成的Langmuir-Blodgett单分子膜-CN基团的相位及强度SFG光谱信息。实验结果表明,由于Z-cutα-石英表面8CB分子-CN基团SFG光谱具有Voigt线型且均匀展宽半宽(38)(28)5.29±0.08 cm~(-1)、非均匀展宽半宽(35)w(28)5.42±0.07 cm~(-1),导致其SFG强度光谱与相位光谱宽度有2.4cm~(-1)的差别。由于SiO_2膜层的引入对Z-cutα-石英的体相SFG信号相位产生了调制,诱导SiO_2/Z-cutα-石英表面8CB分子-CN基团的相位光谱表现出显著的畸变现象。研究结果对于阐释SFG光谱线型以及基于Z-cutα-石英进行复杂多层膜系结构设计并开展相位光谱检测提供了重要思路。
As a unique spectroscopic tool in surface and interface studies, sum-frequency generation vibrational spectroscopy(SFG-VS) has been widely used to get the information on molecular spectroscopic identification, orientation and conformation, and ultrafast reaction kinetics. Based on the recently developed high-resolution(<1cm~(-1)) SFG-VS technique and internal heterodyne phase-resolved method, we measured the imaginary and intensity SFG spectra of the –CN stretching vibration in 4-n-octyl-4'-cyanobiphenyl(8CB) LB monolayer on Z-cut α-quartz and SiO_2/Z-cut α-quartz surfaces. These results reveal that the linewidth(FWHM) difference of 2.4cm~(-1) between the intensity and imaginary spectra of the –CN stretching of 8CB LB monolayer on Z-cut α-quartz agrees quantitatively with a Voigt lineshape with a homogeneous broadening half width of(38)(28) 5.29 ± 0.08 cm~(-1)and an inhomogeneous standard derivation width(35)w(28) 5.42 ± 0.07 cm~(-1). Due to the phase modulation induced by the addition of SiO_2 film, the Imaginary spectrum showed distinct distortion for the –CN stretch of 8CB LB monolayer on SiO_2/Z-cut α-quartz surface. This work sheds new lights on the interpretation of the lineshapes of SFG spectra and provides new significant strategy for the phase-resolved SFG spectra studies based on Z-cut α-quartz crystal.
As a unique spectroscopic tool in surface and interface studies, sum-frequency generation vibrational spectroscopy(SFG-VS) has been widely used to get the information on molecular spectroscopic identification, orientation and conformation, and ultrafast reaction kinetics. Based on the recently developed high-resolution(<1cm~(-1)) SFG-VS technique and internal heterodyne phase-resolved method, we measured the imaginary and intensity SFG spectra of the –CN stretching vibration in 4-n-octyl-4'-cyanobiphenyl(8CB) LB monolayer on Z-cut α-quartz and SiO_2/Z-cut α-quartz surfaces. These results reveal that the linewidth(FWHM) difference of 2.4cm~(-1) between the intensity and imaginary spectra of the –CN stretching of 8CB LB monolayer on Z-cut α-quartz agrees quantitatively with a Voigt lineshape with a homogeneous broadening half width of(38)(28) 5.29 ± 0.08 cm~(-1)and an inhomogeneous standard derivation width(35)w(28) 5.42 ± 0.07 cm~(-1). Due to the phase modulation induced by the addition of SiO_2 film, the Imaginary spectrum showed distinct distortion for the –CN stretch of 8CB LB monolayer on SiO_2/Z-cut α-quartz surface. This work sheds new lights on the interpretation of the lineshapes of SFG spectra and provides new significant strategy for the phase-resolved SFG spectra studies based on Z-cut α-quartz crystal.
引文
[1]Velarde,L.;Zhang,X.-Y.;Lu,Z.;Joly,A.G.;Wang,Z.;Wang,H.-F.J.Chem.Phys,2011,135:241102.
[2]Fu,L.;Chen,S.-L.;Wang,H.-F.J.Phys.Chem.B,2016,120:1579.
[3]Chen,S.-L.;Fu,L.;Gan,W.;Wang,H.-F.J.Chem.Phys,2016,144:034704.
[2]Fu,L.;Chen,S.-L.;Wang,H.-F.J.Phys.Chem.B,2016,120:1579.
[3]Chen,S.-L.;Fu,L.;Gan,W.;Wang,H.-F.J.Chem.Phys,2016,144:034704.