| abstract |
PROBLEM TO BE SOLVED: To provide a contrast agent that has a better sensitizing effect than spherical gold fine particles and is less likely to accumulate in a living body than rod-shaped nanoparticles made of gold, and a method for producing the same. SOLUTION: Rod-like nanoparticles containing any one of gold, silver, copper, and platinum, and an extinction coefficient of 0.1 cm −1 or less in a wavelength region of 700 to 1200 nm existing around the rod-like nanoparticles. A contrast agent comprising a material having a wavelength and having a particle shape. [Selection figure] None |