| Budget Amount *help |
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2016: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
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| Outline of Final Research Achievements |
Gold nanoparticles exhibit strong absorption and scattering by interacting with visible light, kown as surface plasmon resonance (LSPR). LSPR decays nonradiatively resulting in particle heating and heat transfer to the surroundings. This photothermal effect attracted much attension because of potential therapytic appication to cancer. We perfomed fundamental researches on this effect to aquire basic knowledge for possible applications. We measured with transient absorption spectroscopy the dynamics: nucleation, growth and colape of photothermal bubbles. The experinental observation was interpreted by the temperature calculation. We also performed sigle particle spectroscopy to measure the Rayleigh light scattering scectra under continuous laser illumination. We observed the phase transtions of a single gold nanoparticle depending on laser fluence. The single particle spectroscopy revealed the phase separation of thermoresponsive polymers around a gold nanoparticle under illunmination.
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