Cracks formation in the vertical co-depositing colloidal crystal
It is a cost-efficient approach to take the colloidal crystals (CCs) as template to fabricate three-dimensional photonic crystals. However, cracks occurring in the colloidal crystal synthesis process typically divided a colloidal crystal film into single crystalline domains of several tens of micrometers size, setting a major obstacle to the application of CCs template method. As a modified method, the co-deposition of microsphere and nanoparticles in CCs formation was put forward to reduce the formation of cracks. However, the physical mechanism of crack inhibition in co-deposition process was not well studied. In this paper, we reported an in-situ observation study on the crack formation in the co-deposition process. It was found that the crack morphology has a large difference compared with that in the normal CCs template method. The cracks in normal CCs growth are usually formed and developed as parallel straight lines along the substrate surface in the growth direction. In contrary, the cracks present a pattern of regular triangular lattices in co-deposition. The crack morphology changes from CCs process to co-deposition process was considered to have a strong relationship to the gel formation in co-deposition procedure which can be ignored in the normal CCs growth. The corresponding physical model was developed and compared with the experimental results. The present study was helpful to give a deep insight into the crack formation mechanism in the colloidal spheres (CSs) assembling process.
Crack co-deposition colloidal crystal
Ding Lan Yuren Wang
Chinese Academy Science,Institute of Mechnices,National Microgravity Lab,Key Lab Microgravity,Beijing 100190,China
国际会议
北京
英文
1-5
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）