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Figure a: Photographs of Plasmonic Colloidosomes; Panel b: SEM images; Panel c: Scanning-TEM images; Panel d: “Black Gold†reflectance spectra from different angles. White polytetrafluoroethylene (PTFE) as the test substrate. Figure e: Absorption spectra of "black gold" (i) and gold nanoparticles (ii) sols.
Recently, the Liyue Research Group of the Institute of Solid State Physics, Chinese Academy of Sciences, and the Li Cun-Cheng Research Group of Professor Jinan University collaborated on the construction of a 3-D new plasmonic material (Plasmonic Colloidosome) and its resonant coupling with strong plasma elements. The research has made new progress. The related research results are based on the Black Gold: Plasmonic Colloidosomes with Broadband Absorption Self-Assembled from Monodispersed Gold Nanospheres by Using a Reverse Emulsion System, and the Hot Paper in the academic journal Angew. Chem. Int. Published on Ed. 2015, 54, 9596-9600).
Metallic nanomaterials have unique localized surface plasmon resonance (LSPR) absorption and scattering properties. The superstructures constructed with these nanomaterials as basic units can exhibit novel and interesting optical and mechanical properties, and thus are much more appreciated. Researcher's attention. For example, in the biomedical field, Plasmonic capsules with a micro-nano hollow structure can load drug molecules for cancer treatment, and at the same time achieve a dual treatment model combining chemotherapy and hyperthermia, which will provide a good application prospect for the early diagnosis and treatment of cancer. At present, the commonly used preparation method of Plasmonic capsules induces spontaneous but irregular cross-linking of surface-modified gold nanoparticles. In contrast, the structure of Colloidosomes is a new type of nano-shell structure, which is mainly based on the soft template method, and consists of regular self-assembly of nanoparticles on the interface. The structure can avoid cumbersome nano-particle surface modification and other processes, if the precious metal nano-structured unit is used to obtain the three-dimensional colloidal body structure, the shell structure is favorable for the enhancement of electromagnetic field coupling between particles and will have a wider application prospect.
To this end, the research team designed a novel reversed microemulsion template method based on monodisperse spherical nanoparticles in the early stage. The monodisperse spherical gold nanoparticles were used as the basic building block, using water-normal butadiene. The alcohol microemulsion system, for the first time, is a real three-dimensional ordered Plasmonic Colloidosomes (PCs) structure driven by the lowest principle of interfacial free energy. The PCs structure has a strong plasma element resonance coupling, can absorb most of the light in the visible light region, is black from the apparent color, it is also known as "black gold." Compared with the traditional microemulsion template method, this method makes full use of the partial solubility of oil/water in the reverse microemulsion template system and realizes the assembly of PCs with micron-sized and regular multilayer shells. The currently reported noble metal secondary structure will provide a new platform for the application of biosensors, drug loading, optical microcavities and microreactors.
After the results of the study were published, "German Applied Chemistry" also conducted research highlights on A New Way to Black Gold: Colloidosomes made of gold nanoparticles offer strong plasmonic coupling. In addition, the domestic X-MOL chemical information platform also reported on the topic of "black gold: self-assembled gold colloidosomes and its strong plasma motif resonance coupling."
The above research was funded by the 973 project, the National Natural Science Foundation of China, and the "crossover and cooperation team" of the Chinese Academy of Science and Technology Innovation.
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