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. 2020 May 12;15:106. doi: 10.1186/s11671-020-03341-w

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Pyroelectric effects of LN/PP/MWCNT nanocomposite. a Schematic diagram of the LN/PP/MWCNT composited film fabrication process. b Schematic illustration of the LN/PP/MWCNT pyroelectric nanogenerator structure and working mechanism: (I) the initial polarization state, (II) the heated, and (III) the cooled state of the LN/PP/MWCNT PCF. c Photographs of the heating element working with a DC power supply. d, e Pyroelectric current and trend of the LN/PP/MWCNT composited sensor with temperature ramping dependency and LN microparticles’ concentration dependency