Optical Trapping of Nanocrystals at Oil/Water Interfaces: Implications for Photocatalysis
Optical Trapping of Nanocrystals at Oil/Water Interfaces: Implications for Photocatalysis
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DOI：
10.1021/acsanm.1c02335
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发表时间：
2021-10
影响因子：
5.9
通讯作者：
Yasuyuki Tsuboi;S. Naka;D. Yamanishi;T. Nagai;K. Yuyama;T. Shoji;B. Ohtani;Mamoru Tamura;T. Iida;T. Kameyama;T. Torimoto
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作者：
Yasuyuki Tsuboi;S. Naka;D. Yamanishi;T. Nagai;K. Yuyama;T. Shoji;B. Ohtani;Mamoru Tamura;T. Iida;T. Kameyama;T. Torimoto
在松散聚焦条件下，研究了无机纳米晶体在油水界面的光学俘获。目标纳米晶体为八面体金纳米粒子（OGPs，尺寸为70 nm）、水稻形（10 nm × 20 nm） ZnS-AgInS2（ZAIS）纳米粒子和八面体二氧化钛（TiO2）纳米粒子（OTPs，尺寸为100 nm）。虽然我们无法在均相液体（正己烷或水）中捕获这些纳米颗粒，但它们成功地捕获在油/水界面上。我们还研究了二元体系在界面处的捕获，其中OGPs和ZAIS纳米颗粒分别分散在水（下层）和正己烷（上层）中。我们观察到在油水界面形成了OGP和ZAIS颗粒的复合物（杂化）。有趣的是，即使在线偏振光照射下，复合粒子在捕获过程中也保持旋转。这一现象提示了光耦合纳米粒子中旋转对称性的自发破坏。将这种界面捕获技术应用于光催化反应。我们观察到在紫外光照射下，捕获在界面上的OTPs生成了金纳米粒子。液/液界面可以强烈地辅助光捕获和诱导特征化学行为。
Optical trapping of inorganic nanocrystals at oil/water interfaces was investigated under a loose focus condition. The target nanocrystals were octahedral gold nanoparticles (OGPs, 70 nm in size), rice-shaped (10 nm × 20 nm) ZnS-AgInS2(ZAIS) nanoparticles, and octahedral titania (TiO2) nanoparticles (OTPs, 100 nm). While we were unable to trap these nanoparticles in homogeneous liquids (n-hexane or water), they were successfully trapped at an oil/water interface. We also investigated trapping for a binary system at an interface, where OGPs and ZAIS nanoparticles were dispersed in water (lower layer) andn-hexane (upper layer), respectively. We observed the formation of a complex (hybrid) of an OGP and ZAIS particle trapped at the oil/water interface. Interestingly, the complex particle kept rotating during trapping even under irradiation of linearly polarized light. This phenomenon suggested the spontaneous breakdown of rotational symmetry in the optically coupled nanoparticles. This interfacial trapping technique was applied to a photocatalytic reaction. We observed the generation of Au nanoparticles from OTPs trapped at an interface under UV light irradiation. Liquid/liquid interfaces can strongly assist optical trapping and induce characteristic chemical behavior.