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An Effective Dark–Vis–UV Ternary Biomimetic Switching Based on N3/Spiropyran‐Modified Nanochannels
Author(s) -
Zhang Dan,
Wang Qinqin,
Fan Xia,
Zhang Mingliang,
Zhai Jin,
Jiang Lei
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201804862
Subject(s) - spiropyran , materials science , molecule , ternary operation , photochemistry , ion , ultraviolet , photochromism , nanotechnology , optoelectronics , chemistry , organic chemistry , computer science , programming language
Many natural photomodulated nanochannels are investigated and are crucial for biological activity. Biomimetic nanochannels with a bistable conductance state under light stimulus are demonstrated. In this system, two molecules, cis ‐bis‐(4,4′‐dicarboxy‐2,2′‐bipyridine) dithiocyanato ruthenium(II) (N3) and spiropyran 1′‐(3‐carboxypropyl)‐3′,3′‐dimethyl‐6‐nitro‐spiro[2H‐1]benzopyran‐2,2′‐indoline (SP‐COOH), each with unique photoresponsive properties, are modified in alumina nanochannels. The two segments of the hourglass‐shaped alumina nanochannels are designated to graft a certain molecule. Under ultraviolet (UV) or visible light (vis) irradiation, electrons belonging to N3 are excited, resulting in negatively charged surfaces on the sides of nanochannels modified with N3 molecules. Only under UV stimulus, the conformation change of the SP‐COOH molecules leads to positively charged surfaces of nanochannels in the SP‐COOH occupied sides. Benefiting from the joint effect of N3 and SP‐COOH, low, medium, and high (i.e., “0,” “1,” and “2”) ternary levels of ion conductance are established under the dark–vis–UV alternate stimuli. The multistage current switching containing “0‐1‐2‐0” and “0‐1‐2‐1‐0” procedures is stable and robust. Additionally, the diode‐like ion transport behavior of the nanochannels could be exploited to support a multivalued logical gating with the management of light signals.