Issue

Vol. 12 (2020)

Nanoscale All-Oxide-Heterostructured Bio-inspired Optoresponsive Nociceptor

https://doi.org/10.1007/s40820-020-00419-z
Mohammad Karbalaei Akbari
Centre for Environmental and Energy Research, Ghent University Global Campus, Incheon, South Korea
Jie Hu
College of Information Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People’s Republic of China
Francis Verpoort
Laboratory of Organometallics, Catalysis and Ordered Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People’s Republic of China
Hongliang Lu
School of Microelectronic, Fudan University, Shanghai 200433, People’s Republic of China
Serge Zhuiykov
Centre for Environmental and Energy Research, Ghent University Global Campus, Incheon, South Korea

Corresponding Author: Serge Zhuiykov

Serge.Zhuiykov@ugent.be

Nano-Micro Letters, Vol. 12 (2020), Article Number: 83

Abstract

Retina nociceptor, as a key sensory receptor, not only enables the transport of warning signals to the human central nervous system upon its exposure to noxious stimuli, but also triggers the motor response that minimizes potential sensitization. In this study, the capability of two-dimensional all-oxide-heterostructured artificial nociceptor as a single device with tunable properties was confirmed. Newly designed nociceptors utilize ultra-thin sub-stoichiometric TiO2–Ga2O3 heterostructures, where the thermally annealed Ga2O3 films play the role of charge transfer controlling component. It is discovered that the phase transformation in Ga2O3 is accompanied by substantial jump in conductivity, induced by thermally assisted internal redox reaction of Ga2O3 nanostructure during annealing. It is also experimentally confirmed that the charge transfer in all-oxide heterostructures can be tuned and controlled by the heterointerfaces manipulation. Results demonstrate that the engineering of heterointerfaces of two-dimensional (2D) films enables the fabrication of either high-sensitive TiO2–Ga2O3 (Ar) or high-threshold TiO2–Ga2O3 (N2) nociceptors. The hypersensitive nociceptor mimics the functionalities of corneal nociceptors of human eye, whereas the delayed reaction of nociceptor is similar to high-threshold nociceptive characteristics of human sensory system. The long-term stability of 2D nociceptors demonstrates the capability of heterointerfaces engineering for effective control of charge transfer at 2D heterostructured devices.


Highlights:


1 Artificial optoelectronic nociceptor based on two-dimensional heterostructured all-oxide nanostructures was designed.
2 Two-dimensional heterointerfaces were functionalized, and their engineering toward fabrication of artificial nociceptors was confirmed.

Keywords

2D heterostructures Artificial nociceptors Bio-inspired device Heterointerfaces engineering
Akbari, Mohammad Karbalaei, Jie Hu, Francis Verpoort, Hongliang Lu, and Serge Zhuiykov. 2020. “Nanoscale All-Oxide-Heterostructured Bio-Inspired Optoresponsive Nociceptor”. Nano-Micro Letters 12 (April):83. https://doi.org/10.1007/s40820-020-00419-z.
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