Organic Memory Device Based on Carbazole‐Substituted Cellulose
Organic Memory Device Based on Carbazole‐Substituted Cellulose
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DOI：
10.1002/marc.200700186
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发表时间：
2007-07
影响因子：
4.6
通讯作者：
Makoto Karakawa;M. Chikamatsu;Y. Yoshida;R. Azumi;K. Yase;C. Nakamoto
中科院分区：
文献类型：
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作者：
Makoto Karakawa;M. Chikamatsu;Y. Yoshida;R. Azumi;K. Yase;C. Nakamoto
合成并表征了一种新型功能化纤维素衍生物6-O-[4-（9 H-咔唑-9-基）丁基]-2，3-二-O-甲基纤维素。纤维素衍生物的铸膜的光致发光光谱表现出尖锐的峰与明确的电子振动结构，这表明咔唑基团之间的相互作用是相当弱的。这与聚（N-乙烯基咔唑）薄膜的广谱性形成鲜明对比。一个薄膜装置，其中的纤维素衍生物被夹在两种不同的金属，显示出一个激烈的过渡后，向前和向后扫描的外部电场的低和高电导率状态。这种可逆的电流密度转变行为展示了典型的存储器特性，其中ON/OFF（高导电性和低导电性）状态表现出约四个数量级的电流比。具有咔唑等官能团的纤维素衍生物是有机电子材料的候选材料。
A novel functionalized cellulose derivative, 6-O-[4-(9H-carbazol-9-yl)butyl]-2,3-di-O-methyl cellulose, has been synthesized and characterized. The photoluminescence spectrum of the as-cast film of the cellulose derivative exhibits sharp peaks with a well-defined vibronic structure, which indicates that the interaction between carbazole groups is rather weak. This is in contrast to the broad spectrum of a poly(N-vinylcarbazole) thin film. A thin-film device, where the cellulose derivative is sandwiched by two different metals, shows a drastic transition between low- and high-conductivity states upon the forward and backward sweeping of an external electric field. This reversible current density transition behavior demonstrates a typical memory characteristic, with the ON/OFF (high- and low-conductivity) states exhibiting a current ratio of about four orders of magnitude. The cellulose derivative with a functional group such as a carbazole moiety will be a candidate for organic electronic materials.