Author(s): Goswami, Sumita ; Nandy, Suman ; Calmeiro, Tomás R. ; Igreja, Rui ; Martins, Rodrigo Ferrão de Paiva ; Fortunato, Elvira Maria Correia
Date: 2016
Origin: Repositório Institucional da UNL
Subject(s): POLYANILINE; SEPARATION; TRIBOELECTRIFICATION; SENSORS; General
This work was partially financed by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT under the project UID/CTM/50025/2013 and EXCL/CTM-NAN/0201/2012. S. Nandy is supported by FCT-MEC under fellowship SFRH/BPD/70367/2010.
Mechano-electrical writing and reading in polyaniline (PANI) thin film are demonstrated via metal-polymer contact electrification mechanism (CEM). An innovative conception for a non-destructive self-powered writable-readable data sheet is presented which can pave the way towards new type of stress induced current harvesting devices. A localized forced deformation of the interface has been enacted by pressing the atomic force microscopic probe against the polymer surface, allowing charge transfer between materials interfaces. The process yields a well-defined charge pattern by transmuting mechanical stress in to readable information. The average of output current increment has been influenced from 0.5 nA to 15 nA for the applied force of 2 nN to 14 nN instead of electrical bias. These results underscore the importance of stress-induced current harvesting mechanism and could be scaled up for charge patterning of polymer surface to writable-readable data sheet. Time evolutional current distribution (TECD) study of the stress-induced patterned PANI surface shows the response of readability of the recorded data with time.
