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Doping and alloying in atomically precise gold nanoparticles

Nano Research 2014年第3期7卷 285-300页

作者： Rongchao Jin katsuyuki nobusada Department of Chemistry Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Department of Theoretical and Computational Molecular Science Institute for Molecular Science Myodaiji Okazaki 444-8585 Japan and Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Katsura Kyoto 615-8520 Japan

The recent success in the synthesis and total structure determination of atomically precise gold nanoparticles has provided exciting opportunities for fundamental studies as well as the development of new applications. These unique nanoparticles are of molecular purity and possess well defined formulas （i.e., specific numbers of metal atoms and ligands）, resembling organic compounds. Crystallization of such molecularly pure nanoparticles into macroscopic single crystals allows for the determination of total structures of nanoparticles （i.e., the arrangement of metal core atoms and surface ligands） by X-ray crystallography. In this perspective article, we summarize recent efforts in doping and alloying gold nanoparticles with other metals, including Pd, Pt, Ag and Cu. With atomically precise gold nanoparticles, a specific number of foreign atoms （e.g., Pd, Pt） can be incorporated into the gold core, whereas a range of Ag and Cu substitutions is observed but, interestingly, the total number of metal atoms in the homogold nanoparticle is preserved. The heteroatom substitution of gold nanoparticles allows one to probe the optical, structural, and electronic properties truly at the single-atom level, and thus provides a wealth of information for understanding the intriguing properties of this new class of nanomaterials.

关键词： gold nanoparticle atomic precision total structure doping alloying

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Optically controlled magnetic-field etching on the nano-scale

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Light(Science & Applications) 2016年第1期5卷 522-528页

作者： Takashi Yatsui Toshiki Tsuboi Maiku Yamaguchi katsuyuki nobusada Satoshi Tojo Fabrice Stehlin Olivier Soppera Daniel Bloch School of Engineering University of TokyoBunkyo-kuTokyo113-8656 Japan Department of Theoretical and Computational Molecular Science Institute for Molecular ScienceMyodaijiOkazaki444-8585 Japan Faculty of Science and Engineering Chuo UniversityBunkyo-kuTokyo112-8551 Japan Institut de Sciences des Materiaux de Mulhouse(IS2M) CNRSUMR7361Universite´de Haute-Alsace15rue Jean StarckyBP2488Mulhouse Cedex 68057France Laboratoire de Physique des Lasers UMR 7538 du CNRSUniversite´Paris13-Sorbonne-Paris-Cite´F-93430 VilletaneuseFrance

Electric and magnetic fields play an important role in both chemical and physical ***,since the coupling efficiency between magnetic fields and electrons is low in comparison with that between electric fields and electrons in the visible wavelength region,the magnetic field is negligible in photo-induced ***,we performed photo-etching of ZrO_(2) nano-stripe structures,and identified an etching-property polarisation ***,the etching rate and etched profiles depend on the structure *** evaluate this polarisation-dependent etching,we performed numerical calculations using a finite-difference time-domain ***,the numerical results revealed that the polarisation-dependent etching properties were determined by the magnetic field distributions,rather than the electric field *** nano-scale structures induce a localised magnetic field,the discovery of this etching dependence on the magnetic field is expected to introduce a new perspective on advanced nano-scale structure fabrication.

关键词： nano-scale near-field etching optically controlled magnetic-field interaction

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