Near-infrared optical performances of two Bi2Se3 nanosheets

Bi2Se3 has been widely used as a promising photothermal and photoacoustic agent recently. Herein, twodimensional (2D) Bi2Se3 nanosheets with different sizes of about 30 nm (Bi2Se3-30) and 80 nm (Bi2Se3-80) have been successfully synthesized via solution-based methods. Both of the Bi2Se3 nanosheets possess high near-infrared (NIR) optical absorption, efficient photothermal conversion and excellent photoacoustic behaviors. Meanwhile, the Bi2Se3-30 nanosheets perform better. These results indicate the smaller Bi2Se3 nanosheets are more promising for optical diagnostic and photothermal therapy.