New method for preparation of nano-composite selective laser micro-nano welding

Nanocomposites have important applications in the energy, sensing, and field of solar cell catalysis. Preparation mostly conventional nanocomposite material is achieved between the composite nanoparticle generation process, often requires a material prepared post-processing requires the use of toxic metal salt (e.g. AgNO3, H2PtCl6) during the manufacturing process as a precursor. Therefore, it would be important to directly fabricate nano-composites with commercially available different properties of nanoparticles.

Based on this, Li Xiangyou, a researcher at Wuhan Optoelectronics National Laboratory, led a doctoral student Yu Huiwu and others to propose a method for preparing nanocomposites by welding metal and semiconductor nanoparticles together in a liquid medium using a laser (as shown in the figure). The method may be modified semiconductor nanoparticles and a plurality of metal welded together, for example, Ag / TiO2, Ag / SnO2, Ag / ZnO2, Pt / TiO2, Pt / SnO2, Pt / ZnO. Studies have shown that this method of soldering can improve the performance of nanomaterials by using materials with different properties. Moreover, the size, morphology, crystal form and even the component content of the prepared nanocomposite particles can be controlled. The method is simple in process, high in composite efficiency, and almost no waste of raw materials.

Schematic diagram of selective laser micro-nano soldering of metal and semiconductor nanoparticles in liquid medium

May 8, 2017, the research results "Fabrication of me tal / semico nductor nanocomposites by selective laser nano-welding published in the Royal Society of Chemistry (RSC) 's journal" on the Nanoscale ". In addition, in recent years the team in laser and nano In the field of particle interaction, systematic research has been carried out. Based on the non-focusing laser irradiation technology, the controllable preparation of carbon quantum dots, titanium dioxide colloidal spheres and hollow titanium dioxide microspheres has been realized, and the interaction between laser and matter in liquid medium has been deeply studied. recently has the mechanism in Chemical Communications (52, 819-822, 2016 ), RSC Advances (6, 110911-110915, 2016), the Journal of Physical Chemistry C (Published o nline 19 May 2017, DOI:. 10.1021 / acs.jpcc .7b03464 published related achievements).

The above research was funded by the National Natural Science Foundation of China (61378031).

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