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Scientists of Chinese Academy of Sciences realize water writing and electric wiping of PEDOT photonic crystal colorful patterns

2019-07-26 来源:转载自第三方
Many applications based on optical research shape today's information society and human understanding of the universe. For example, fiber-optic communications and remote satellite remote sensing technology help us understand the Earth to predict weather, monitor and manage environmental pollution. Recently, Dr. Wang Jingxia, a researcher of the Biomimetic materials and Interface Science Laboratory of the Institute of Physics and Chemistry of the Chinese Academy of Sciences, collaborated with Professor Guo Jinshan of Lanzhou University to realize the water writing and electric wiping of colorful patterns on the PEDOT photonic crystal.
The concept of photonic crystals was proposed by E. Yablonovitch in the United States and S. John in Canada in 1987. Yablonovitch's research is to reduce the power consumption of the radar and improve the stealth performance of the radar. The work of S.John is about the photon localization which the photon is limited to a certain range of space. Their research goals are completely different, but they propose the same new concept. The concept of photonic crystals has attracted great interest and attention from scientists all over the world. A research boom in photonic crystals has arisen worldwide. Later, photonic crystals are widely used in many fields such as bioimaging, spectroscopy, face recognition, laser radar, and virtual reality.
In particular, photonic crystal patterns have very important applications in sensing, anti-counterfeiting, optical display and other optical devices. So what exactly is PEDOT? PEDOT is a polymer of EDOT (3,4-ethylenedioxythiophene monomer). It has the characteristics of simple molecular structure, small energy gap and high electrical conductivity. It is widely used as organic thin film solar cell materials, OLED materials , transparent electrode materials and so on.
They prepared poly(3,4-ethylenedioxythiophene (PEDOT) photonic crystals (PEDOT-IO-0) by electropolymerization and found that the prepared PEDOT-IO has four states and three different switch forms. The first switch is The irreversible reduction process from PEDOT-IO-0 to PEDOT-IO-I (neutral state). The second switch is a reversible electrochemical process between PEDOT-IO-I (neutral state) and PEDOT-IO-I (oxidized state), accompanied by reversible bandgap due to ion doping/dedoping (structure Color changes. The third switch is water treatment PEDOT-IO-I (oxidation state) to form PEDOT-IO-II, due to water-induced LiClO4 molecules (Li+ and ClO4- ions) removal and periodic structural shrinkage, causing blue shift of photonic band gap .
By reversing the PEDOT-IO-1(Ox) water-induced LiClO4 molecular removal effect in combination with the electrochemical modulation of PEDOT-IO-I, a reversible water-write/erase multi-color crystal pattern can be achieved. This research work provides new ideas for the preparation of optical materials and devices based on photonic crystals.
[1] Adv. Mater. Inter., 2015, 1400365; J. Mater. Chem. C, 2015, 3, 2445; J. Mater. Chem. C., 2018, 6, 3849
Related links: PEDOT
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