The type and structure of abrasive particles play a key role in the involved friction and wear processes during chemical mechanical polishing (CMP). This work aims to develop silica-based abrasives that improve both surface finish and removal rate. The uniform, three-dimensional, and dendritic-like mesoporous silica (D-mSiO2) spheres with sub-100 nm size were synthesized in a heterogeneous oil–water biphase reaction system. The pore size of 3D-dendritic channels could be adjusted by regulating hydrophobic solvents in the upper oil phase. The improvements of root-mean-square roughness (0.18–0.26 nm) and removal rate (192–260 nm/min) were achieved for the D-mSiO2 particles compared to colloidal silica abrasives (0.37 nm, 112 nm/min). A reduction from 2.90 to 0.48 and 2.60 to 0.42 nm for the maximum asperity height and the maximum valley depth respectively was also observed after CMP with D-mSiO2 abrasives. Furthermore, the D-mSiO2 particles with an enlarged pore size achieved a reduced surface roughness and an enhanced removal rate. The improved polishing performance may be attributed to the enlarged real contact area, the promoted tribo-chemical wear, and the enhanced adhesion effect between particles and surfaces. The contact area mechanism and the contact-penetration-adhesion model may be predominant and significant for D-mSiO2 abrasives, rather than the traditional the indentation-based mechanism and the indentation-sliding model. The unique three-dimensional mesopores of D-mSiO2 abrasives are expected to play key role in material removal processes, and it will have more hopeful prospects in CMP performance improvements.
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The project is supported by National Natural Science Foundation of China (Grant Nos. 51405038, 51575058, 51875052), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Chen, Y., Ma, X., Cai, W. et al. Preparation of three-dimensional dendritic-like mesoporous silica particles and their pore size-dependent polishing behavior and mechanism. J Porous Mater 26, 1869–1877 (2019). https://doi.org/10.1007/s10934-019-00777-z
- Mesoporous silica
- 3D-dendritic silica
- Pore size
- Particle abrasive
- Chemical mechanical polishing