TY - JOUR
T1 - Photomagnetic Langmuir-Blodgett films consisting of azobenzene and Prussian Blue
T2 - Correlation between the film structure and the photomagnetic efficiency
AU - Yamamoto, Takashi
AU - Umemura, Yasushi
AU - Sato, Osamu
AU - Einaga, Yasuaki
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research on Priority Area (417) and the 21st Century COE program “KEIO Life Conjugate Chemistry” from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of the Japanese Government.
PY - 2006/3
Y1 - 2006/3
N2 - A photomagnetic organized thin film consisting of an amphiphilic azobenzene, a smectite clay, and Prussian Blue has been prepared by utilizing the Langmuir-Blodgett (LB) method and an ion-exchange reaction. The magnetic LB films were revealed to possess an organized layered structure, and reversible photoisomerization of the azobenzene was observed even in the LB films. Upon photoillumination at 2 K, reversible changes in the magnetization were realized with the value of ca. 11%. This photoswitching in the magnetization is due to changes in the electrostatic field induced by photoisomerization of the azobenzene. A large photoinduced change in the magnetization would be owing to the highly ordered structure of the LB films. In order to verify the correlation between the film structure and photoswitching efficiency, the LB films have been fabricated in other condition. As results, it is confirmed that the packing state of the azobenzene plays an important and crucial role in accomplishment of the highly efficient photomagnetic switching.
AB - A photomagnetic organized thin film consisting of an amphiphilic azobenzene, a smectite clay, and Prussian Blue has been prepared by utilizing the Langmuir-Blodgett (LB) method and an ion-exchange reaction. The magnetic LB films were revealed to possess an organized layered structure, and reversible photoisomerization of the azobenzene was observed even in the LB films. Upon photoillumination at 2 K, reversible changes in the magnetization were realized with the value of ca. 11%. This photoswitching in the magnetization is due to changes in the electrostatic field induced by photoisomerization of the azobenzene. A large photoinduced change in the magnetization would be owing to the highly ordered structure of the LB films. In order to verify the correlation between the film structure and photoswitching efficiency, the LB films have been fabricated in other condition. As results, it is confirmed that the packing state of the azobenzene plays an important and crucial role in accomplishment of the highly efficient photomagnetic switching.
KW - Air-water interface
KW - Azobenzene
KW - Clay mineral
KW - Langmuir-Blodgett films
KW - Organic-inorganic hybrid
KW - Photocontrollable magnet
KW - Photoswitching
KW - Prussian Blue
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U2 - 10.1016/j.stam.2005.10.003
DO - 10.1016/j.stam.2005.10.003
M3 - Article
AN - SCOPUS:33645848945
SN - 1468-6996
VL - 7
SP - 134
EP - 138
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
IS - 2
ER -