Congratulations! PhD student Cheng Liu received ‘Oral Presentation Award’ in the 652th PhD Forum of Tsinghua University on Flexible Electronics Technology

柔性电子器件 清华大学博士论坛 刘诚口头报告奖
The 652th PhD Forum of Tsinghua University on Flexible Electronics Technology is held on December 5th,  our PhD student Cheng Liu gave an oral presentation named 'Dynamic Covalent Polymer Network with Diselenide Bond' and received an Excellence in Oral Presentation Award.
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The 3rd Table Tennis Tournament of Xu’s Group

第十四届乒乓球赛合影
On Dec. 2nd, 2021, the 3rd Table Tennis Tournament of Xu's Group was held in Gas Film Hall, Tsinghua University, with 16 group members joining in. The tournament is divided into two groups, after a fierce competition, Mr. Yiheng Dai and Dr. Luo Zhang advanced to the final round. And finally, Dr. Luo Zhang won the championship of this year's tournament. This tournament provides a good chance for the people who love table tennis to show their style, also, the communication and connection between group members have been strengthened. Keep positive in both exercise, work and life! ...
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Laser-Induced Remote Healing of Stretchable Diselenide-Containing Conductive Composites

Peng Zhao, Jiahao Xia, Jianbing Liu, Yizheng Tan, Shaobo Ji and Huaping Xu ACS Appl. Mater. Interfaces, 2021, 13, 50422. Remotely controlled on-demand functional healing is vital to components that are difficult to access and repair in distance such as satellites and unmanned cruising aircrafts. Compared with other stimuli, a blue laser is a better choice to input energy to the damaged area in distance because of its high energy density and low dissipation through the air. Herein, diselenide-containing polyurethane (PUSe) is first employed to fabricate visible light-responsive stretchable ...
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Xu’s Group Attended 2021 National Annual Polymer Congress

许老师获奖照片
On September 23rd-26th 2021, Prof. Huaping Xu, Dr. Luo Zhang, Mr. Cheng Liu, Mr. Peng Zhao, Mr. Shuojiong Pan, Mr. Yiheng Dai, Mr. Banruo Xianyu and Mr. Yizheng Tan attended 2021 National Annual Polymer Congress. Prof. Huaping Xu co-chaired Session J: Polymer Assembly and Supramolecular System with Profs. Jianzhong Du, Wei Tian and Feng Wang. Prof. Huaping Xu gave an invited presentation of "Selenium-containing Assemblies for Combined Cancer Immuno-, Radio-, and Chemotherapies" on Sep. 24th. Dr. Luo Zhang, Mr. Cheng Liu, Mr. Peng Zhao, Mr. Shuojiong Pan and Mr. Yiheng Dai presented po...
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Selenium-containing Surface/interface Chemistry

Jiahao Xia, Huaping Xu Chem. J. Chinese Universities, 2021, 42, 997. Selenium is an essential element to human body. Our research group has recently revealed many unique features of selenium-containing bonds. For instance, diselenide bond has dual redox response, and it is also a type of dynamic bond which can undergo exchange reaction under visible light irradiation. Combing those interesting properties of selenium-containing bonds with surface/interface chemistry can endow system with unique responsive behaviors. This article reviews the recent progresses we made in the field of selenium...
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Unconstrained 3D Shape Programming with Light-Induced Stress Gradient

Cheng Liu, Yizheng Tan, Chaowei He, Shaobo Ji, and Huaping Xu Adv. Mater., 2021, 33, 2105194. Programming 2D sheets to form 3D shapes is significant for flexible electronics, soft robots, and biomedical devices. Stress regulation is one of the most used methods, during which external force is usually needed to keep the stress, leading to complex processing setups. Here, by introducing dynamic diselenide bonds into shape-memory materials, unconstrained shape programming with light is achieved. The material could hold and release internal stress by themselves through the shape-memory effect,...
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Selenium-Sulfur-Doped Carbon Dots with Thioredoxin Reductase Activity

Luo Zhang, Chenxing Sun, Yizheng Tan and Huaping Xu CCS Chem., 2022, 4, 2249. Thioredoxin reductase (TrxR) is an essential enzyme for regulating the redox balance in cells, promoting cell proliferation, and inhibiting cell apoptosis. The biochemical pathway of TrxR metabolism involves a series of selenium-sulfur (Se-S) dynamic chemistry.  Theoretically, nanomaterials with Se-S dynamic bonds could exhibit TrxR-mimetic activities to tune TrxR activity and thus affect the cell activities. Herein, we report the selenium-sulfur-doped carbon dots (Se-S-CDs) synthesized by a facile hydrothermal m...
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Measuring the Strength of S/Se Based Dynamic Covalent Bonds

Jiahao Xia, Hongbin Li, Huaping Xu Acta Polym. Sin., 2020, 51, 205.   Sulfur, selenium-containing bonds, including disufide bond (SS), diselenide bond (SeSe), and selenide-sulfide bond (SeS), are an important type of light responsive dynamic covalent bonds. Among them, SS and SeS bonds can undergo exchange reaction with the irridiation of UV light, while SeSe bond only requires visible light due to its weaker bond energy. The purpose of this research is to use atomic force microscope-based single molecule force spectroscopy (AFM-SMFS) measurement to reveal the reasons behind the re...
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