Exceptional photoconductivity of poly(3-hexylthiophene) fibers through in situ encapsulation of molybdenum disulfide quantum dots

Nanoscale
Vishnu NairChandramouli Subramaniam

Abstract

Photo-responsive, electrically conductive nanostructures are highly desirable for wide-ranging applications in energy harvesting, nanophotonic and optoelectronic devices. To this end, we realize self-assembled, photoconductive hybrids of poly(3-hexylthiophene) (P3HT) micro- and nano-fibers integrated with MoS2 quantum dots (QDs). We present an innovative strategy to impregnate QDs within the walls of the P3HT fibers resulting in the emergence of the controllable photoconductivity of the QD-P3HT hybrid. The maximum photoconductivity (>80% higher than pristine P3HT) is observed at 360 nm and originates from a synergistic combination of (a) defect healing and quenching of surface trap states in QDs by P3HT and (b) efficient generation and transfer of photo-excited charges from P3HT to QDs. This mechanism is substantiated by a concomitant decrease in the excited-state lifetime of the QD-P3HT hybrid. Furthermore, a linear correlation between the enhancement in the emission of QDs and the emission quenching of P3HT supports the proposed mechanism of excited-state charge transfer. Finally, the hybrid of MoS2 nanosheets (NS) with P3HT fibers (NS-P3HT) does not exhibit any photo-conductivity and instead exhibits ground state charge tran...Continue Reading

References

Feb 14, 2009·Journal of the American Chemical Society·Yun-Yue LinChun-Wei Chen
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Mar 16, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Jiangang LiuYanchun Han
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Jul 24, 2013·Nature Communications·Chandramouli SubramaniamKenji Hata
Jul 12, 2014·ACS Applied Materials & Interfaces·Long-Biao HuangVellaisamy A L Roy
Feb 11, 2015·Chemical Communications : Chem Comm·Deepesh GopalakrishnanManikoth M Shaijumon
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Nov 8, 2017·ACS Applied Materials & Interfaces·Maku Moronshing, Chandramouli Subramaniam
Dec 31, 2017·Journal of Colloid and Interface Science·Vishnu NairM Aslam

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Methods Mentioned

BETA
transmission electron microscopy
electron diffraction
AFM
irradiate
electron microscopy
atomic force microscopy

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