Give a bunch of light, and the bacteria come to work! Chinese scientists recently used bacteria to transport and arrange quantum dots to solve this problem. They used the technology to draw the circuit, and fabricated the interdigital electrode array, and proved that it could be used as a touch switch. But the bigger highlight is that Chinese scientists have taken the lead in developing optical control technology to achieve fine control of the manufacturing process. The minimum array precision of the quantum dots coating can reach 100 microns (microns, 1/1000000 meters). Applying this technology to chip design and artificial photosynthesis system is our long-term goal. In April 23rd, Zhong Chao, an assistant professor and researcher at Shanghai University of science and technology who led the study, told www.thepape.cn. Published in the international academic journal advanced materials on the inner cover: the Zhong Chao team used the dynamic self-assembly of biofilm to achieve the formwork of inorganic nano material materials and space-time controlled self-assembly. The assembly process has the characteristics of dynamic regulation, environment self-adaptive and multilevel composite. Bacteria are a porter, a whitewash Quantum dots are known as artificial atoms. They are nanoscale semiconductor materials. It is gradually being applied to biomedicine, optoelectronic devices and other fields. QLED, which contains quantum dots, is thought to be the next generation of mobile phone screens and TV screens, because of the lower cost and higher color saturation, which will replace the OLED screen used by new mobile phones such as iphoneX. The superior performance of these new mobile phones and solar panels depends on the uniform quantum dot coating. But how do we deposit nano sized quantum dots evenly on the substrate according to the design? Traditional industrial manufacturing technologies are photolithography, magnetron sputtering and evaporation. In the research done by the Zhong Chao team, the quantum dots were used to paint the painter and Porter of the coating as E. coli. It is the most frequently encountered bacteria and rod in peoples lives. It resides in the intestines of everyone. But why can E. coli carry quantum dots and other nanoparticles? No Zhong Chaos team, through gene manipulation, modifies a protein, CsgA, secreted by E. coli, enabling CsgA to identify and combine inorganic nanomaterial quantum dots chemically modified by metal coordination. This establishes the relationship between Escherichia coli and quantum dots. When the Escherichia coli secretes the CsgA protein to form a biofilm, the quantum dots are connected to the CsgA protein, like a gourd, hanging on the filaments or vines of the blanket of the biofilm to form a coating. Zhong Chao said that because the CsgA protein first made up fibers, the fibers rearranged to form the capsule. A subunit of fiber, the CsgA protein, identifies a nanoparticle. Therefore, quantum dots are arranged very regularly on fibers, rather than stacked together. We can see from the microscope that the coating of quantum dots is very regular. With the thickening of the biofilm layer, the coating of quantum dots can be superimposed. Researchers can add different quantum dots in chronological order, such as red [email protected] quantum dots, green [email protected] quantum dots, blue [email protected] quantum dots, etc., to form different coatings and fold together according to the design drawings. Why can light command Escherichia coli When the researchers gave blue light, the Zhong Chao team reformed the Escherichia coli that secreted CsgA protein and produced the membrane, otherwise the CsgA protein was not secreted, and the membrane was not formed. Therefore, what patterns and shapes of coatings can be used to counteract the corresponding optical control schemes. They printed a hollowed sphere and printed logo of Shanghai University of science and technology. Zhong Chao said that the special feature of biofilms is super adhesion. Even in the most smooth non stick coating Teflon (PTFE), E. coli can also form thin biofilms. It can not only be pasted on the plane, but also on the curved three-dimensional plane of the cylinder, E. coli can also be deployed to produce quantum dots. According to Zhong Chao, as early as 2014, the Massachusetts Institute of Technology research team in the United States reported that the modified CsgA was used to coupling gold nanoparticles and quantum dots, and an electrical switch for environmental responsive biofilm was created. But in 2014, this method is to add gold nanoparticles or quantum dots after biofilm generation. Because nanoparticles can not penetrate into the tight biofilm content, the binding efficiency is low and can not meet the needs of larger scale production. Moreover, the process of induction (or regulation) in this method in 2014 is only dependent on small molecules, so it is impossible to dynamically regulate the self-assembly of nanoparticles at time and space scales. Zhong Chaos team put gold nanoparticles and quantum dots into the culture environment of Escherichia coli from the very beginning. In general, its control is more difficult. But through the blue light optical control programming, the Zhong Chao team can achieve extremely fine control in time and space. These coliforms, which listen to blue light, have been genetically modified in advance. Only when blue light appears, they produce modified CsgA protein and produce biofilm. Without Blu ray, these E. coli grow quiet without producing biofilms. It is precisely because of the addition of gold nanoparticles and quantum dots at the beginning. The assembly of these nanoparticles by Escherichia coli is closely linked to the production and assembly of the biofilm of the Escherichia coli, so the binding efficiency is greatly improved, and it is easy to achieve large-scale production. For the first time, Zhong Chaos team used quantum dots and other nanoparticles as raw materials to complete three-dimensional solid shapes and patterns with bacteria. We can achieve more complex and more large-scale self-assembly of single and multiple nanoparticles on two dimensional and three-dimensional substrates. Zhong Chao said. In addition, the biofilm is highly resistant to high temperature, acid and alkali, and is very stable, which is different from ordinary protein materials. The Zhong Chao research team proposed that this dynamic nano - object self - assembly method has potential applications in Bioelectronics, optoelectronic devices, biocatalysis and wearable devices. The living functional materials created by the technology may be applied to the fields of artificial photosynthesis system, fuel cell, etc. Quantum dots coating will produce electrons after receiving sunlight. Under the coating, bacteria accept these electrons, and then generate hydrogen and become fuel cells. Zhong Chao said that in the finished products, sterilization could also be used to kill E. coli or replace probiotics. All of these bring great imagination to people. The source of this article: surging news editor: Hou Wei Cheng _NT4124 We can achieve more complex and more large-scale self-assembly of single and multiple nanoparticles on two dimensional and three-dimensional substrates. Zhong Chao said. In addition, the biofilm is highly resistant to high temperature, acid and alkali, and is very stable, which is different from ordinary protein materials. The Zhong Chao research team proposed that this dynamic nano - object self - assembly method has potential applications in Bioelectronics, optoelectronic devices, biocatalysis and wearable devices. The living functional materials created by the technology may be applied to the fields of artificial photosynthesis system, fuel cell, etc. Zhong Chao said that in the finished products, sterilization could also be used to kill E. coli or replace probiotics. All of these bring great imagination to people.