| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2018: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
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| Outline of Final Research Achievements |
Advanced atomic-resolution electron microscopy including Gaussian process regression for statistical noise reduction has disclosed quantitatively local strain inherent in gold nanoparticles depending on the shape with an improved accuracy about 0.2 %. Rod-shaped nanoparticles involve characteristic expansion strain ~+1.0 % along the long axis within capped tip portions, in addition to surface contraction skin generally existing in nanoparticles. The shape depending inherent local strain has been evidenced by molecular dynamics simulations, and has been attributed to curvature-dependent surface contraction stress. The present results bring hints to nanoscale engineering to optimize the interior strain in nanoparticles by shape control. In addition, the structural and shape transformation of gold nanorods under near-infrared laser illumination has been explained well experimentally in terms of abrupt heating due to the absorbed energy.
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