Journal
NANOSCALE
Volume 9, Issue 23, Pages 7760-7764Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr07143k
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Funding
- National Natural Science Foundation of China [21373144]
- Chinese Ministry of Science and Technology [2016YFE0129800]
- National Research Foundation of Singapore (CREATE Programme of Nanomaterials for Energy and Water Management)
- Natural Science Foundation of Jiangsu Province [BK20150007, BK20151228]
- Natural Science Foundation in High Education of Jiangsu Province [16KJB430024]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- 111 Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Building a complex structure system of conductive polymers without a complicated fabricating process is a long-awaited goal to improving the functional photoresponse properties of conductive polymers. In this study, we demonstrate that the photoresponse of polypyrrole (PPy)-based photodetector devices with an ultrathin polymer layer can be chemically modulated by simply immersing the devices into an alkaline solution. After alkaline treatment, the pyrrole unit transforms into a quinoid structure. Characteristics of current-voltage reveal an increased photosensitivity with several orders of magnitude when decreasing the applied bias voltage. Furthermore, ultrathin PPy belts with a width of 100 nm exhibit ultra-high photosensitivites of roughly 1000 (unit) and photoresponsivities of 54.3 A W-1 due to the high surface area ratio of the nanobelts.
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