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Research Article

Bioinspired polydopamine coated nanopore nanofluidic unijunction transistor exhibiting negative differential resistance and ion current oscillation

Yong Wang1,2, Wenting Guo1,2, Bo Wang3, Ya Zhou4, Ping Hu1,2, Jiangtao Ren1( ), Erkang Wang1,2( ), Yongdong Jin1,2,3( )
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
Guangdong Key Laboratory of Biomedical Measurements and Ultrasound Imaging, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen University, Shenzhen 518060, China
Quality and Safety Engineering Institute of Food and Drug, Zhejiang Gongshang University, Hangzhou 310018, China
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Graphical Abstract

A nanofluidic unijunction transistor was constructed based on a chemically modified nanopipette with polydopamine which exhibited negative differential resistance and ion current oscillation in ionic transport. The as-prepared nanofluidic semiconductor device was a ready-to-use equipment that required no additional external conditions.

Abstract

Nanofluidic devices have turned out to be exemplary systems for investigating fluidic transport properties in a highly restricted area, where the electrostatic interactions or chemical reactions between nanochannel and flowing species strongly dominate the ions and flow transport. Numerous nanofluidic devices have recently been explored to manipulate ion currents and construct electronic devices. Enlightened by electronic field effect transistors, utilizing the electric field effect of nanopore nanochannels has also been adopted to develop versatile nanofluidic devices. Here, we report a nanopore-based nanofluidic unijunction transistor composed of a conical glass nanopipette with the biomaterial polydopamine (PDA) coated at its outer surface. The as-fabricated nanofluidic device exhibited negative differential resistance (NDR) and ion current oscillation (ICO) in ionic transport. The pre-doped copper ions in the PDA moved toward the tip as increasing the potential, having a robust shielding effect on the charge of the tip, thus affecting the surface charge density of the nanopore in the working zone. Finite element simulation based on a continuum model coupled with Stokes–Brinkman and Poisson–Nernst–Planck (PNP) equations revealed that the fluctuations in charge density remarkably affect the transport of ionic current in the nanofluidic device. The as-prepared nanofluidic semiconductor device was a ready-to-use equipment that required no additional external conditions. Our work provides a versatile and convenient way to construct nanofluidic electronic components; we believe by taking advantage of advanced surface modification methods, the oscillation frequency of the unijunction transistors could be controlled on demand, and more nanofluidic devices with resourceful functions would be exploited.

Keywords

polydopaminenanoporeunijunction transistornegative differential resistanceion current oscillation

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Nano Research
Volume 17 Issue 11,
November 2024
Pages 10026-10033
DOI: 10.1007/s12274-024-6908-y
Cite this article:
Wang Y, Guo W, Wang B, et al. Bioinspired polydopamine coated nanopore nanofluidic unijunction transistor exhibiting negative differential resistance and ion current oscillation. Nano Research, 2024, 17(11): 10026-10033. https://doi.org/10.1007/s12274-024-6908-y
Topics:
Nanoelectronics

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Received: 21 May 2024
Revised: 10 July 2024
Accepted: 22 July 2024
Published: 20 August 2024
© Tsinghua University Press 2024
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