X-ray diffraction measurement of a single nanometre-sized particle levitated in air by an optical-trap sample holder
X-ray diffraction measurement of a single nanometre-sized particle levitated in air by an optical-trap sample holder
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通过光阱样品架对悬浮在空气中的单个纳米级颗粒进行 X 射线衍射测量
DOI：
10.1107/s1600577519013651
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发表时间：
2020
影响因子：
2.5
通讯作者：
Kimura Shigeru
中科院分区：
文献类型：
--
作者：
Fukuyama Yoshimitsu;Yasuda Nobuhiro;Sugimoto Kunihisa;Kimura Shigeru
研制了一种用于同步辐射X射线衍射测量的单光束光学陷阱样品架。样品支架被用来获得单个氧化锌颗粒在聚焦激光施加的光学梯度力作用下无机械接触地漂浮在空气中的X射线衍射图。衍射图显示为德拜环状花样，类似于一组氧化锌颗粒的粉末衍射图。当氧化锌粒子被光学陷阱固定在空气中时，它会不规则地旋转。因此，即使氧化锌颗粒是单颗粒，也可以清楚地获得其德拜环状图案。同时测定了单颗粒氧化锌的晶格参数和微晶尺寸。测得晶格参数为a=3.2505±0.0005 ？和c=5.207±0.006 ？，与氧化锌颗粒的组装值一致。谢勒法测得的微晶尺寸为193.4±26.2 nm。
A single-beam optical-trap sample holder for X-ray diffraction measurements with synchrotron radiation has been developed. The sample holder was used to obtain an X-ray diffraction image of a single ZnO particle levitated in air, without mechanical contact, by the optical gradient force exerted by a focused laser beam. The diffraction image showed a Debye ring pattern, which was similar to a powder diffraction pattern of an assemblage of ZnO particles. While the ZnO particle is held by the optical trap in air, it rotates irregularly. Therefore, the Debye ring pattern of the ZnO particle can be clearly obtained even if the ZnO particle is a single grain. Lattice parameters and crystallite size of the single ZnO particle were determined simultaneously. The lattice parameters were determined to be a = 3.2505 ± 0.0005 Å and c = 5.207 ± 0.006 Å, which are consistent with those of the assemblage of ZnO particles. The crystallite size determined by the Scherrer method was 193.4 ± 26.2 nm.