Journal
NANOSCALE
Volume 9, Issue 2, Pages 637-646Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr06573b
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Funding
- National Natural Science Foundation of China [11374240, 61275105, 61605160]
- International Cooperative Program [201410780]
- Ph.D. Programs Foundation of the Ministry of Education of China [20136101110007]
- Key Laboratory Science Research Plan of Shaanxi Education Department [13JS101, 16JK1781]
- Natural Science Foundation of Shaanxi Province [2016JQ1010]
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Light-induced difference terahertz (THz) spectroscopy is used to investigate the dielectric characteristics of reduced graphene oxide-gelatin (rGO-Gel) flexible films. RGO-Gel films are observed to exhibit positive photoconductance under 800 nm laser illumination, resulting in the modulation depth of the THz transmission up to 33.5%. Moreover, persistent photoconductance (PPC), which is a prolonged light-induced conducting behavior, has been observed to last as long as tens of seconds in rGO-Gel films. The PPC phenomenon is due to the electrons trapped in the defects of rGO and in the interface between rGO and gelatin, and is enhanced by the strong interaction between rGO (a p-type semiconductor) and gelatin (electron donors). This work holds potential for creating optoelectronic devices based on rGO-Gel films, such as optical modulators, switches, photodetectors, photosensors, and persistent photonic memory devices in the THz region.
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