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内容記述 |
Fluorescent nanodiamonds (FNDs) have characteristic optical and magnetic properties stemming from unpaired electron spins associated with lattice defects specifically, nitrogen substitutions near vacancies in their crystal structure called as NV centers. These properties make FNDs valuable as high-sensitivity nano-quantum sensors for applications in life sciences and analytical chemistry. FNDs can be manufactured by the detonation method. However, the resulting materials typically contain impurities like sp2 carbon and non-fluorescent nanodiamonds, requiring further purification. There is a report that a few FNDs were precisely sorted by resonant light-induced force. Nevertheless, more efficient and rapid sorting approaches are needed to process larger amounts of FNDs. On the other hand, photothermal assembly is known as a method that can condense many small objects at high speed and at high density by utilizing the light-induced convection; for example, a gold nanofilm is locally heated with a focused laser and a light-induced bubble can be used as the assembly site. In this study, we attempted selective collection of FND via control of photothermal convection and micro-bubble by adjusting the optical system. |
