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All-organic composites with strong photoelectric response over a wide spectral range

在宽光谱范围内具有强光电响应的全有机复合 材料

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Abstract

2-hydroxynaphthylidene-1′-naphthylamine (HNAN) and −NO2 modified HNAN (HNAN-NO2) Schiff base compounds were synthesized and exhibited strong visible light absorption (<650 nm). These compounds were added to poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) ferroelectric polymer, obtaining composites with high photoelectric response under visible and infrared light. It was found that the modification of HNAN by the nitro group and the poling of the composites under a high electric field can greatly enhance the photoelectric response of the composites. The composites can generate high photovoltages of 1386 and 352.7 mV under irradiation with near-infrared light (915 nm) and green light (532 nm). The mechanism of the photoelectric response of the composites under green light was explored and it was found that the response originates mainly from the coupling effect of the photothermal effect of the Schiff base and the pyroelectric effect of the ferroelectric polymer. The composites, which can be utilized as photodetector materials, are promising for next-generation artificial retina applications and the sensing capability of retina can be extended in a wide wavelength range from visible to infrared light.

摘要

本文合成了席夫碱化合物2-hydroxynaphthylidene-1′-naphthylamine (HNAN)和硝基改性的HNAN (HNAN-NO2). 这两 种化合物在可见光(<650 nm)下显示出强吸光性. 我们将这些化合 物与Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE))铁 电聚合物复合, 得到了在可见光和红外光下具有高光电响应的复 合材料. 研究发现, 利用HNAN的硝基改性或高电场下对复合材料 进行极化可以大大增强复合材料的光电响应. 复合材料在近红外 光(波长915 nm)下可产生1386 mV的光电压, 而在绿光(532 nm)下 可产生352.7 mV的光电压. 本文还探索了复合材料在绿光下的光 电响应的产生机理, 发现其响应主要源于席夫碱的光热效应和铁 电聚合物的热释电效应之间的耦合作用. 该复合材料可作为光电 材料应用于下一代人工视网膜的光响应材料, 并使人工视网膜能 够感知的光波段从可见光扩展到红外光.

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Acknowledgements

This research was supported by the National Key Research and Development Program of China (2017YFA0701301), and the National Natural Science Foundation of China (51373161 and 51672261).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. CAS Key Laboratory of Materials for Energy Conversion and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Jie Liu  (刘杰), Kewang Yi  (易可望), Zhaopeng Wang  (王兆鹏), Pan Chen  (陈攀) & Baojin Chu  (初宝进)

  2. Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China

    Zijie Zhang  (祁瑜聪), Yucong Qi  (张子劼) & Qundong Shen  (沈群东)

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  1. Jie Liu  (刘杰)
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  2. Kewang Yi  (易可望)
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  6. Pan Chen  (陈攀)
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Contributions

Chu B, Shen Q and Liu J conceived the idea; Liu J, Yi K and Wang Z fabricated the samples and characterized the structure and electrical properties of the samples; Zhang Z and Qi Y helped to measure the photovoltaic response of the samples.; Chen P helped to obtain the FTIR and H-NMR spectra. All authors contribute to the general discussion.

Corresponding authors

Correspondence to Qundong Shen  (沈群东) or Baojin Chu  (初宝进).

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There are no conflicts to declare.

Supplementary information

Supporting data are available in the online version of the paper.

Jie Liu was born in Liaoning province in 1993. He received the BE degree in polymer science and engineering from the University of Science of and Technology of China in 2015. Currently he is a PhD candidate in material science and engineering at the University of Science and Technology of China. His research is focused on the electrical properties of PVDF-based polymers.

Baojin Chu received his PhD from Pennsylvania State University in 2008. After post-doctoral research in the Materials Research Institute at Pennsylvania State University, he worked as a research scientist in CAPE Lab at South Dakota School of Mines and Technology. Currently, he is a faculty at the University of Science and Technology of China (since 2012). His research interests include ferroelectricity, piezoelectricity, and flexoelectricity of materials, and related applications

Qundong Shen received his BSc in polymer materials and PhD degree in polymer physics and chemistry from Nanjing University. He is presently a professor at the Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University. He has been active in the design and syntheses of functional polymers. His current research focuses on ferroelectric polymers for information storage and energy utilization, as well as conjugated polymers for biomedical applications.

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Liu, J., Yi, K., Wang, Z. et al. All-organic composites with strong photoelectric response over a wide spectral range. Sci. China Mater. 64, 1197–1205 (2021). https://doi.org/10.1007/s40843-020-1515-1

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