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- W2073497305 abstract "Radial breathing oscillation of 2-D arrayed GaN nanorods was successfully excited in rods with different diameters by using femtosecond transient reflectivity measurement. Through analyzing thus measured diameter dependent oscillation frequency, we discovered that modification of the mechanical property appeared in the 2-D arrayed piezoelectric GaN nanorods, fabricated on top of a bulk substrate, when the rod diameter was on the order of or less than 50 nm. Our measurement observed a much reduced elastic stiffness constant (C11) of 193 ± 24 GPa in 35nm diameter nanorods, compared with the 365 ± 2 GPa in bulk GaN. This size-reduction induced mechanical modification would be a critical factor to be considered for future sensing and energy applications. Our study also provides a new spectroscopic method to explore the size-reduction-induced softening effect through the measurement of the radial breathing oscillations." @default.
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- W2073497305 date "2012-07-09" @default.
- W2073497305 modified "2023-10-18" @default.
- W2073497305 title "Femtosecond excitation of radial breathing mode in 2-D arrayed GaN nanorods" @default.
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- W2073497305 doi "https://doi.org/10.1364/oe.20.016611" @default.
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