Speaker
Description
In this work, we report the segregation-driven in situ generation
of Ag NWs on the surface of a Ag2WO4 (AWO) nanorod (NR) under
electron beam irradiation in an aberration corrected-TEM
(AC-TEM). We adopted AWO as the starting material because
previous studies have demonstrated Ag surface segregation and
the formation of Ag NPs on the oxide support under plasma or
electron beam irradiation.(1-3) By controlling the electron
irradiation dose rate, sub-10 nm Ag NWs (9.5 0.2 nm) are
fabricated on the oxide surface. The generated Ag NWs show a
tunable length/diameter aspect ratio, and the formed surface in the
NWs is the low-energy {111} plane. The direct in situ observations on
the nucleation and growth dynamics uncover that the sub-10 nm
silver NWs show a combined growth process of linear first-order
kinetics and nonlinear second-order kinetics in the lateral direction
and the electron dose rate plays an important role in regulating the
diameter of the supported Ag NWs.(4)
References
1. J. Li, Z. Wang, Y. Li and F. L. Deepak, Adv. Sci., 2019, 6, 1802131.
2. M. d. Assis, et al., Sci. Rep., 2019, 9, 9927.
3. R. A. Roca, et al., Inorg. Chem., 2016, 55, 8661–8671.
4. J. Li and F. L. Deepak, Chem. Commun., 2020, 56, 4765--4768.
| Speaker Country | Portugal |
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