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      Direct identification of the charge state in a single platinum nanoparticle on titanium oxide

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          Abstract

          A goal in the characterization of supported metal catalysts is to achieve particle-by-particle analysis of the charge state strongly correlated with the catalytic activity. Here, we demonstrate the direct identification of the charge state of individual platinum nanoparticles (NPs) supported on titanium dioxide using ultrahigh sensitivity and precision electron holography. Sophisticated phase-shift analysis for the part of the NPs protruding into the vacuum visualized slight potential changes around individual platinum NPs. The analysis revealed the number (only one to six electrons) and sense (positive or negative) of the charge per platinum NP. The underlying mechanism of platinum charging is explained by the work function differences between platinum and titanium dioxide (depending on the orientation relationship and lattice distortion) and by first-principles calculations in terms of the charge transfer processes.

          Visualizing metal nanoparticle charging

          Charging of metal nanoparticles supported on metal oxides can occur during catalytic reactions and can be measured as an average charge with x-ray photoemission spectroscopy or as anomalies in surface potential with scanning probe microscopy. Aso et al . used ultra-high-precision electron holography to directly identify the charge state of single platinum nanoparticles supported on a titanium dioxide crystal (see the Perspective by Gao and Terasaki). A phase-shift analysis visualized slight changes that resulted from charging around the parts of the platinum nanoparticle that extended out from the surface into the vacuum. A platinum nanoparticle could gain or lose one to six electron charges depending on the nanoparticle structure (lattice strain) or its orientation on the titanium dioxide support. —PDS

          Abstract

          Phase-shift analysis on the vacuum-protruding region of nanoparticles visualized slight positive and negative charging.

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                Author and article information

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                Journal
                Science
                Science
                American Association for the Advancement of Science (AAAS)
                0036-8075
                1095-9203
                October 14 2022
                October 14 2022
                : 378
                : 6616
                : 202-206
                Affiliations
                [1 ]Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan.
                [2 ]Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
                [3 ]Research and Development Group, Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan.
                [4 ]Graduate School of Information Science and Technology, Osaka University, Suita, Osaka 565-0871, Japan.
                [5 ]The Ultramicroscopy Research Center, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan.
                [6 ]National Institute of Technology, Akashi College, Akashi, Hyogo 674-8501, Japan.
                Article
                10.1126/science.abq5868
                36227985
                3db291ab-6578-408d-8a6a-f1dd50cb3a2f
                © 2022
                History

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