Li Yue, research group of Institute of solid state physics, Chinese Academy of Sciences: dynamic control of exciton coupling Au nanosphere dimer stable super sensitive optical sensor

In recent years, using the color change caused by the dispersion and polymerization of Au nanoparticles, scientists have successfully constructed many colorimetric sensors, which are widely used for visual detection, such as heavy metal ions, food additives, toxic reagents, etc However, the analog color sensor, which is usually triggered by the target analyte, is characterized by dispersion (or disassembly) and polymerization (or assembly) of Au nanoparticles, which is random and uncontrollable, resulting in low sensitivity and poor stability of the device Therefore, it is still a challenge to develop colorimetric sensors with high sensitivity, strong stability and wide range of dynamic control Recently, the Li Yue Research Fellow of the Institute of solid physics, Chinese Academy of Sciences, has worked with the Chinese Academy of Sciences and University of Jinan to propose a new way of combining Au two polymers with intelligent hydrogels, utilizing the optical Gao Min sense and tunable gap dependent properties of Au two polymers A new type of colorimetric sensor with high sensitivity, high stability and dynamic adjustable sensitivity range based on Au dimer was developed The results were published on advanced functional materials (DOI: 10.1002 / ADFM 201707392) Li Yue research group was founded in 2011 Its main research direction is metallic periodic micro / nano structure metamaterials and their device applications For example, we have developed a batch preparation method of uniform size monodisperse spherical metallic nanoparticles by laser irradiation Taking the monodisperse metallic nanoparticles as the construction unit, we have proposed a new strategy of gas-liquid interface assembly based on surface tension gradient and a method of in-situ replication of colloidal template, which has realized the large-area assembly of two-dimensional (2D) metallic periodic nanomaterials, and proposed the water / oil partial mutual solubility The self-assembly of inverse microemulsion leads to the successful fabrication of complex three-dimensional (3D) metallic periodic micro / nano structure metamaterials Based on the above new type of metamaterials, the dual channel optical properties of 2D metal periodic nanomaterials are discovered, and the new principle of optical sensing is proposed; the visual sensing detection of super optical response is realized; the strong coupling effect of isoexciton of 3D metal periodic micro / nano structure is revealed, and the broadband super light absorption in visible light band is realized Relevant achievements were published in the magazines of angel Chem Int ed., ACS Nano, adv.funct Mater., small, Acta Mater., adv mater Interfaces, etc Li Yue, a doctor, researcher and doctoral supervisor, was selected into the youth thousand talents program of the central organization department In 2000, he completed his undergraduate and master's studies in Xi'an University of architecture and technology, and in 2005, he obtained his doctor's degree in Solid State Institute of Chinese Academy of Sciences Since then, he has successively worked in KAIST, AIST and MPI Since 2011, he has been a researcher and doctoral supervisor of Hefei Institute of Physical Sciences, Chinese Academy of Sciences The main research direction is metal periodic micro / nano structure metamaterials and their device applications So far, they have been applied in Chem SOC Rev., coord Chem Rev., angel Chem Int ed., J am Chem SOC., ACS Nano, Acta mater., adv funct Mater., small, More than 120 papers have been published in international journals such as chem Mater And the published papers have been cited more than 6000 times, h-index: 41 He was invited to be editor in chief of Journal of advances in nanomaterials, editorial board member of nanotechnology and nano futures, current nanoscience and other SCI magazines Leading edge research achievements: dynamic control of exciton coupling Au nanospheres dimer stable hypersensitive optical sensor Au nanosphere dimer (abbreviated as Au dimer) refers to that Au nanosphere appears in pairs, showing special properties different from single nanosphere particles For example, it produces a new local surface plasmon resonance coupling peak, and its apparent color changes from red to blue purple The theoretical study shows that the resonant coupling peak of Au dimer has a highly gap sensitive dependence, so it is expected to build a colorimetric sensor with ultra-high sensitivity and wide dynamic adjustable sensitivity range Recently, the Li Yue research group of the Institute of solid physics, Chinese Academy of Sciences, CO operated with the Chinese Academy of Sciences and University of Jinan On the basis of obtaining uniform size monodisperse Au nanospheres in the early stage, we adopted silver ion induced assembly technology to obtain mass and high quality Au nanospheres two polymers, and proposed a new idea of combining Au two polymers with intelligent hydrogels A new type of colorimetric sensor with high sensitivity, high stability and dynamic adjustable sensitivity range based on Au dimer was developed Fig 1 a colorimetric sensor based on Au two / chitosan hydrogel (source: Adv Funct Mater.) This sensor cleverly utilizes the characteristics of hydrogel rapidly expanding or shrinking caused by stimulation of external substances, and successfully realizes the precise control of the optical quality of Au nanospheres in the two polymer In this way, a highly sensitive colorimetric sensor can be constructed (as shown in Figure 1) Figure 2. Au two polymer / chitosan hydrogel colorimetric sensor is visualized and sensitively detected in different glucose concentration ranges (source: Adv Funct Mater.) Furthermore, the sensitivity of the hydrogel to the degree of crosslinking is rationally utilized, which greatly broadens the dynamic tunable range of the sensitivity of the device The sensitive detection of glucose analyte in different concentration range is realized (as shown in Figure 2) Fig 3 stability and recycling availability of Au two polymer / chitosan hydrogel colorimetric sensor (source: Adv Funct Mater.) Besides, embedding Au two polymer into hydrogel film can effectively overcome the shortcomings of spontaneous aggregation and sedimentation of Au two polymer, and has good stability After repeated use, the device shows good cycle stability, as shown in Figure 3 Compared with the traditional color sensor based on the assembly and disassembly of Au nanoparticles, the device effectively overcomes the shortcomings of low sensitivity and poor stability caused by the random and uncontrollable agglomeration of traditional Au nanoparticles This work not only provides a new way for the study of the dynamic precise control of the coupling optical properties of excitons such as Au nanospheres dimer, but also provides a new idea for the construction of ultra-high sensitivity and high stability sensing devices The results were published on advanced functional materials (DOI: 10.1002 / ADFM 201707392) Paper link: http://onlinelibrary.willey.com/doi/10.1002/adfm.201707392/full relevant information of researcher Li Yue: http://sourcedb.hf.cas.cn/rjc/ch/201601/t20160119_.html about people and scientific research getting more and more attention in economic life, China ushered 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, chembeango app, 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.