A tenfold increase in electron holography sensitivity exposes the net charge in a single platinum nanoparticle with a precision of just one electron. If you often find yourself off by one while counting your socks after doing the laundry, you might want to take a seat for this. Researchers fr
The research also provides fundamental information for developing future catalysts.
Researchers from Japan have now counted the extra, or missing charges, in a single platinum nanoparticle with a diameter that is only a tenth of that of common viruses. While transmission electron microscopy employs an electron beam to observe materials at the atomic level, electron holography probes electric and magnetic fields using the wave-like properties of electrons. When an electron interacts with a field, it generates a phase shift in its wave, which can be identified by comparing it to a reference wave of an unaffected electron.
On average, the platinum nanoparticles had diameters of only 10 nm—so small that it would take nearly 100,000 to span one millimeter. This new study highlights the importance of directly counting electric charges in a catalyst nanoparticle. For example, in a platinum nanoparticle on a surface of titanium oxide, the visualization of potential distribution by the developed noise reduction process in electron holography revealed negative charging of the nanoparticle with just six extra electrons. This is the first time charges per catalyst nanoparticle were counted with an accuracy of one electron charge.
While the number of electrons per area has been previously reported by averaging over a large-area measurement of many particles, this is the first time scientists could measure a single electron difference in a single particle.
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