利用紫外光获得的铂纳米晶体的空间局部合成及结构表征

Quinson Jonathan, Kacenauskaite Laura, Christiansen Troels L, Vosch Tom, Arenz Matthias, Jensen Kirsten M Ø

Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.

Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.

ACS Omega. 2018 Aug 31;3(8):10351-10356. doi: 10.1021/acsomega.8b01613.

Platinum nanocrystals with a fine control of the crystal domain size in the range 1.0-2.2 nm are produced by tuning the NaOH concentration during the UV-induced reduction of HPtCl in surfactant-free alkaline ethylene glycol. The colloidal solutions obtained are characterized by transmission electron microscopy and pair distribution function analysis, allowing analysis of both atomic and nanoscale structures. The obtained nanoparticles exhibit a face-centered cubic crystal structure even for the smallest nanoparticles, and the cubic unit cell parameter is significantly reduced with decreasing crystallite size. It is further demonstrated how the "UV-approach" can be used to achieve spatial control of the nucleation and growth of the platinum nanocrystals, which is not possible by thermal reduction.

通过在无表面活性剂的碱性乙二醇中紫外诱导还原氯铂酸（HPtCl）过程中调节氢氧化钠浓度，制备出晶畴尺寸在1.0 - 2.2纳米范围内得到精细控制的铂纳米晶体。所获得的胶体溶液通过透射电子显微镜和对分布函数分析进行表征，从而能够对原子结构和纳米尺度结构进行分析。即使对于最小的纳米颗粒，所获得的纳米颗粒也呈现出面心立方晶体结构，并且立方晶胞参数随着微晶尺寸的减小而显著降低。进一步证明了“紫外方法”如何用于实现铂纳米晶体成核和生长的空间控制，而这通过热还原是无法实现的。