Nanopatterning and nanocharge writing in layer-by-layer quinquethiophene/phthalocyanine ultrathin films |
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Authors: | Baba Akira Locklin Jason Xu Risheng Advincula Rigoberto |
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Affiliation: | Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003, USA. |
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Abstract: | Nanometer-scale patterning and charging in layer-by-layer (LbL) ultrathin films of quinquethiophene (5TN)/phthalocyanine (CuPS) provides a novel write-read device using a standard current-sensing atomic force microscopy (CS-AFM). The AFM height images showed dented or raised morphological features that could be selectively manipulated by changing the direction of the bias voltages. The conductivity was repeatedly changed between a conductive and insulating state, originating from an electrochemical charging-discharging effect. This was attributed to electrochemical ion transport and the residual mobile ions present in LbL films. Finally, the nanocharge pattern was written by CS-AFM and read out in a conductivity map image. |
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