Nanoparticle Sintering Behavior Analyzed Using Quasi 4D TEM

By Bhavna KavetiAug 10 2022Reviewed by Susha Cheriyedath, M.Sc. The sintering phenomenon or thermal deactivation of supported nanoparticles results in loss of active surface area, leading to their performance degradation affecting catalysis reactions. Scientists have proposed two mechanisms for sintering nanoparticles: particle migration and coalescence and Ostwald ripening.

The quasi-four-dimensional TEM developed in the present work could be extended to other nanomaterials to have a deeper understanding of their 3D structural evolution under an external stimulus. Related StoriesThe information on nanoparticles’ spatial location is critical to analyzing their sintering behavior, which cannot be obtained based on 2D projection through conventional TEM. Hence, integrating the quasi-four-dimensional TEM with ET introduced the 3D characterization ability, along with the tilting function.

Furthermore, reducing the time interval of tomogram acquisition using ET can help achieve a higher temporal resolution, which captures the 3D evolution of nanoparticles due to sintering. The results from quasi-four dimensional-TEM characterization revealed that the nanoparticles on the inner side remained smaller than the external ones after sintering.

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