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KMID : 1059519970410110594
Journal of the Korean Chemical Society
1997 Volume.41 No. 11 p.594 ~ p.599
RF Sputtered Lithium Nickel Oxide Films and Their Electrochromism
Kim Young-Il

Kim Bae-Whan
Choy Jin-Ho
Campet Guy
Park Nam-Gyu
Portier Josik
Morel Bertrand
Abstract
RF½ºÆÛÅ͸µ¹ýÀ» ½á¼­ Li2xNi1-xO ¹Ú¸·À» Á¦Á¶ÇÏ¿´À¸¸ç, ±× °úÁ¤¿¡¼­ ±âÆÇÀÇ ¿Âµµ(50/230C)¿Í ºÐÀ§±â(Ar/O2)¸¦ º¯¼ö·Î½á ¸·ÀÇ ¹Ì¼¼±¸Á¶¸¦ Á¶ÀýÇÏ¿´´Ù. Åõ°úÀüÀÚÇö¹Ì°æÀ» ÀÌ¿ëÇÑ ¸·±¸Á¶ ºÐ¼®¿¡ ÀÇÇØ ³·Àº ±âÆÇ ¿Âµµ¿Í O2 Á¶°Ç¿¡¼­ ¸·ÀÇ Á¶¼ºÀÔÀÚ°¡ ÀÛ¾ÆÁüÀ» °üÂûÇÏ¿´°í,50C/O2 ÇÏ¿¡¼­ ¾ò¾îÁø Li2xNi1-xO ¹Ú¸·Àº ¾à 80A Å©±âÀÇ ÀÔÀÚ·Î ÀÌ·ç¾îÁ® ÀÖ¾ú´Ù. Àü±âÈ­ÇÐÀû Á¶°Ç ÇÏ¿¡¼­ Li2xNi1-xO ¹Ú¸·ÀÇ º¯»öÇö»ó¿Ã Á¶»çÇÑ °á°ú, ¹Ú¸·ÀÇ ¹Ì¼¼±¸Á¶ ¹ß´Þ¿¡ ÀÇÇØ Li+ ÀÌ¿ÂÀÇ °¡¿ªÀû ¼ö¿ë·®ÀÌ Áõ°¡ÇÏ°í, °á°úÀûÀ¸·Î Àü±âº¯»ö ±â´ÉÀÌ Çâ»óµÊÀ» ¾Ë ¼ö ÀÖ¾ú´Ù. 50¡£C/O2 ÇÏ¿¡¼­ ¾ò¾îÁø 170nmµÎ²²ÀÇ Li2xNi1-xO ¹Ú¸·Àº 30mC/cm2ÀÇ Li+ÀÌ¿Â ¼ö¿ë·Â°ú ÇÔ²² ¾à1.3ÀÇ Èí±¤¹Ðµµ(OD)¸¦ ³ªÅ¸³»¾ú´Ù.
Lithium nickel oxide (Li2xNi1-xO) thin films have been prepared by the RF sputtering of lithiated nickel oxide target, where the film microstructure was controlled by the sputtering atmosphere (Ar/O2) and the substrate temperature (Ts=50/230 ¡É). From the transmission electron microscopic analysis, it is found that the most porous film with the grain size of ¡­80 ¡Ê could be fabricated under the sputtering atmosphere of P(O2)=8¡¿10-2 mbar with the Ts=50 ¡É. In the optical and electrochemical studies, the Li2xNi1-xO films exhibit a significant electrochromic property in association with the lithium insertion/deinsertion process. The amount of charge insertion (Qi) and the optical density (OD) variation depend on the crystallinity of the film as well as its thickness, and for the Li2xNi1-xO film (170 nm thickness) prepared under O2 atmosphere and Ts=50 ¡É, the OD could be increased up to ¡­1.3 by the charge insertion with Qi=30 mC/cm2.
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