Molecular Piezoelectric Research Receives Major Breakthroughs Available in Sensors and Other Applications
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[Chinese instrument network instrument research and development] mobile phone can be bent like a thin film like? B ultrasonic instrument can be attached to the body to monitor physical conditions in real time? Sportswear worn on the body can have automatic power generation function? The breakthrough made by scientific research teams and collaborators of Southeast University in solving the piezoelectricity of molecular materials has made the imagination in these science fiction films possible in the future.

Synthetic new molecular ferroelectric materials
On July 22, Southeast University held a press conference at the School of Chemistry and Chemical Engineering of the Jiulonghu Campus, and announced the latest research results - molecular ferroelectric materials with excellent piezoelectric properties. It was learned from the meeting that the synthesis of this material not only solved the problems that restricted the development of molecular materials in the past 130 years, but also had many applications in the fields of sensors, human-computer interaction technologies, and nano-robots.
Piezoelectricity is the property that a material can produce electricity when it is squeezed or stretched, or it can stretch or shorten when the material is applied with two voltages. Piezoelectric materials are also called piezoelectric materials. People use quartz watches, medical ultrasound, and even the "shake" function of mobile phones are the application of piezoelectric materials in real life.
At present, piezoelectric ceramics are mainly made of inorganic ceramics, but such materials need to be fired at a high temperature, and have the disadvantages of being unable to form a film, having poor flexibility, being unfriendly to environmental protection, being difficult to recycle, and being difficult to be miniaturized. Molecular materials can well complement these deficiencies of inorganic ceramic materials, but the piezoelectric properties of the former are far inferior to the latter.
Today, for the first time, the new molecular ferroelectric materials synthesized by the Southeast University team have reached the level of traditional piezoelectric ceramics in terms of piezoelectric performance, and at the same time have the advantages of molecular materials.
Professor You Yumeng, the person in charge of the research team, illustrated the team's innovation in synthesis. "Piezoelectrics are like sponges. The water squeezed out of sponges is like electricity. The principle of traditional piezoelectric materials is equivalent to extruding on both sides of the sponge. Our piezoelectric material is equivalent to snaking and bending this sponge. You can get a lot of electricity under very little pressure."
According to reports, since the discovery of the piezoelectric effect on the quartz crystal by the Curies Brothers in 1880, there has never been a case where the molecular power generation material has such a large piezoelectric performance.
Of course, difficulties will also arise in the process of innovation.
You Yumeng said that in the research and development process that took nearly 4 years, several of the team's doctors spent only three or four days off during the summer vacation and returned to the laboratory for research. In addition to encountering challenges in design, synthesis, testing, etc., the biggest difficulty is how to make this new direction for the development of molecular ferroelectric materials recognized by inorganic material researchers. "Because they (inorganic materials) research is very mature, there is already a set of own standards, and we hope our new materials can also meet their standards and get their approval."
Sun Yueming, executive vice president of Southeast University’s Research Institute, commented that the results laid the foundation for the team of Southeast University in the field of molecular ferroelectricity research. At the same time, there is a bright future for the miniaturization of molecular ferroelectric materials.
Professor You Yumeng said that the new molecular ferroelectric materials can be applied to the miniaturization of large medical devices in the future. For example, “large-scale equipment” such as blood pressure monitors and B-mode ultrasound machines have been reduced and integrated into everyday clothing to create “wearable” medical devices. In addition, the new molecular ferroelectric materials can also play a role in human-computer interaction technology, micro-electromechanical systems, aerospace and other fields.
However, he also said that it may take more than 10 years from the actual promotion of the laboratory to the application. This requires not only technology, but also cooperation in capital operation.
“The breakthrough of molecular materials in the major breakthroughs in piezoelectricity is like the first total fin fish landing. It brought our research in the field of piezoelectric materials from aquatic to terrestrial, and we see a vast expanse of There is a lot of opportunities and more challenges on this continent.” You Yumeng said, “We also hope that more researchers will join in the study of molecular piezoelectric materials. The material is bigger and better, and it brings more convenience to people."
The Southeast University team of the research also cooperated with universities and colleges such as Nanjing University, Peking University, and Washington University. The research results were published online on July 21, 2017 by the leading academic magazine "Science". This paper is also an important achievement of the Key Laboratory of Molecular Ferroelectric Science and Applications in Jiangsu Province.
(Original title: Southeast University has achieved major breakthrough in molecular piezoelectric research and can be applied to wearable medical devices)

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