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    Home > Chem: Professor Miao Qian's research team of the Chinese University of Hong Kong has invented organic semiconductor materials with unique self-assembly structure, which can achieve high selectivity and high sensitivity in chemical and biological detection

    Chem: Professor Miao Qian's research team of the Chinese University of Hong Kong has invented organic semiconductor materials with unique self-assembly structure, which can achieve high selectivity and high sensitivity in chemical and biological detection

    • Last Update: 2018-07-09
    • Source: Internet
    • Author: User
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    Organic semiconductor is an organic material with semiconductor properties The research team of Professor Miao Qian, Department of chemistry, Chinese University of Hong Kong, has invented organic semiconductor materials with unique self-assembly structure On this basis, the chemical and biological sensors with high selectivity and high sensitivity have been successfully prepared by combining organic thin film transistors and microfluidic pipes This achievement has recently been published in the top Chemical Journal chem ("functional π - stacks of hexabenzoperylenesas a new platform for chemical and biological sensing", Li C.; Wu, H.; Zhang, T.; Liang, Y.; Zheng, B.; Xia, J.; Xu, J.; Miao, Q * Chem, 2018, 4, 1416 – 1426) The first author of this paper is Li Changqing, a doctoral student Prof Miao Qian received his bachelor's degree from China University of science and technology in 2000, and went to the United States to study in the same year He studied with Professor Colin Nuckolls in the Department of chemistry at Columbia University and received his Ph.D in 2005 After one year of postdoctoral training under the guidance of Professor Fred wudl of UCLA, he joined the Department of chemistry of the Chinese University of Hong Kong in 2006 as an assistant professor, and was promoted to associate professor in 2012, professor in 2016, and vice chairman of the Department of chemistry since 2015 The research field involves organic chemistry, organic electronics, supramolecular chemistry and surface chemistry It is devoted to the design and synthesis of interesting and useful condensed aromatic molecules and the development of high-performance organic semiconductor materials and devices Cutting edge scientific research achievements: the invention of organic semiconductor materials with unique self-assembly structure and the realization of chemical and biological detection organic thin film transistors with high selectivity and sensitivity are the basic components of soft, cheap and wearable organic electronic devices One of the most potential applications is chemical and biological sensors Sensors based on organic thin film transistors convert chemical reactions or biological interactions into electrical signal output, which can not only avoid the use of expensive large-scale instruments, but also integrate into biocompatible and wearable electronic devices Compared with the traditional inorganic semiconductor materials, the unique advantage of organic semiconductor materials is that various functional groups can be directly connected with organic semiconductor molecules through organic synthesis These groups can react or interact with specific substances to be tested, so as to achieve high selectivity, high sensitivity of chemical and biological detection However, the introduction of these functional groups will lead to additional intermolecular interactions They usually destroy the π - π stacking between organic semiconductor molecules, which greatly reduces or even completely destroys the conductivity of organic semiconductor materials Therefore, how to introduce functional groups without destroying the π - π packing between organic semiconductor molecules is a challenging problem In response to this challenge, the research team of Miao Qian, Department of chemistry, Chinese University of Hong Kong, designed and synthesized hexabenzoperylene derivatives with different functional groups, and found a rare molecular stacking mode in their crystal structure These hexabenzoperylene derivatives have twisted conjugated skeletons, which form a unique brick structure in the crystal, maintaining the same two-dimensional π - π stacking mode without the influence of various functional groups Figure 1 Stacking mode of hexabenzoperylene derivatives (source: Chem) Since the semiconductor properties of hexabenzoperylene derivatives were discovered by the research team of Muqian a few years ago, this unique molecular self-assembly mode provides a new solution for the functionalization of organic semiconductor materials, It provides a general supramolecular platform for chemical and biological sensors based on organic thin film transistors On the basis of this platform, Miao Qian's research team, in collaboration with his colleague Professor Zheng Bo, successfully prepared the sensor by combining organic thin film transistors and microfluidic pipes When trimethylsilyl ether modified hexabenzoperylene is used as semiconductor material, due to the specific reaction between trimethylsilyl ether and fluorine ion, the sensor can detect fluorine ion in water, showing high selectivity and sensitivity When the biotin modified hexabenzoperylene is used as semiconductor material, the sensor can detect specific protein, streptavidin Due to the specific combination of biotin and streptavidin, the sensor showed a high selectivity for streptavidin, and the detection limit was as low as 3.6 × 10 - 11 mol / L This work involves many subjects, such as organic synthesis, supramolecular chemistry, organic electronics and microfluidic technology It is a successful attempt to solve the problem by cross integration of chemistry and other subjects Miao Qian's research team will continue to use this platform to develop more practical chemical and biological sensors for environmental monitoring and medical diagnosis Figure 2 Sensors based on organic thin film transistors and microfluidics (source: Chem) people and scientific research are increasingly valued in the economic life of science and technology Today, China ushers in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information, chembeangoapp, chembeango official microblog, CBG wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the domestic representative research group, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.
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