Exotic Property of Azobenzenesulfonic Photoalignment Material Based on Relative Humidity

Shi, Yue1,2,3; Zhao, Chenxiang3; Ho, Jacob Yeuk-Lung3; Vashchenko, Valery V.4; Srivastava, Abhishek Kumar3; Chigrinov, Vladimir G.3; Kwok, Hoi-Sing G3; Song, Feng2; Luo, Dan1,3

2017-04-25

10.1021/acs.langmuir.7b00417

LANGMUIR   影响因子和分区

0743-7463

Azobenzene photoalignment materials are highly effective for liquid crystal alignment with high sensitivity and rewritability. A strong relationship between relative humidity and the alignment quality of a thin layer of azobenzenesulfonic dye has been investigated, where the photoinduced phase retardation, order parameter, and anchoring strength of the alignment layer are influenced dramatically by relative humidity. Our results provide fabrication guidance for the photoalignment process in both display and photonic applications. In addition, an exotic substantial ordering enhancement is observed by increasing the relative humidity without further light illumination, where the self-assembly of the photoaligned material incorporated with water molecules is the underlying reason for the enhanced high ordering (S > 0.8). Based on X-ray diffraction and depolarized optical microscopy observation, together with the photoalignment quality, a semicrystalline structure of the humidified azobenzenesulfonic material is proposed. The transition from amorphous solid at low relative humidity to semicrystal at high relative humidity provides a new perspective of understanding the hydrophilic photoalignment materials.

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Council[JCYJ20150601155130435] ; Shenzhen Science and Technology Innovation Council[JCYJ20160226192528793] ; Shenzhen Science and Technology Innovation Council[JCYJ20150930160634263] ; Shenzhen Science and Technology Innovation Council[KQTD2015071710313656]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000400232500008

AMER CHEMICAL SOC

20171703613168

Amorphous materials ; Liquid crystals ; Molecules ; Self assembly ; X ray diffraction

Mechanical Devices:601.1 ; Atomic and Molecular Physics:931.3 ; Amorphous Solids:933.2 ; Materials Science:951

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
2.Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, State Key Lab Adv Displays & Optoelect Technol, Kowloon, Hong Kong, Peoples R China
4.Inst Single Crystals, State Sci Inst, Lenin Ave 60, UA-61001 Kharkov, Ukraine

Shi, Yue,Zhao, Chenxiang,Ho, Jacob Yeuk-Lung,et al. Exotic Property of Azobenzenesulfonic Photoalignment Material Based on Relative Humidity[J]. LANGMUIR,2017,33(16):3968-3974.

Shi, Yue.,Zhao, Chenxiang.,Ho, Jacob Yeuk-Lung.,Vashchenko, Valery V..,Srivastava, Abhishek Kumar.,...&Luo, Dan.(2017).Exotic Property of Azobenzenesulfonic Photoalignment Material Based on Relative Humidity.LANGMUIR,33(16),3968-3974.

Shi, Yue,et al."Exotic Property of Azobenzenesulfonic Photoalignment Material Based on Relative Humidity".LANGMUIR 33.16(2017):3968-3974.