Laser-induced transformation of GaS and GaSe nanosheets to onion structures with closed cages

Bulletin of Materials Science

关键词: 2D layered materials;    few-layer GaS and GaSe;    laser induced dewetting;    giant onions and Raman scattering.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Experimental evidence for the transformation of nanosheets of GaS and GaSe into onion structures on UV excimer pulsed laser irradiation is presented. Few-layer GaS and GaSe on Si substrates were exposed to KrF pulsed laser with wavelength of 248 nm and the effect was studied as a function of number of laser pulses. Laser-induced dewetting of the layers results in the formation of spherical nanoparticles after 50 laser pulses. HREM images of these particles reveal the formation of onions with several concentric layers. The initial thickness of the layers controls the size of the onion cages. A mechanism of transformation of few layers to closed cage onions on UV pulsed laser irradiation is presented.

【 授权许可】

CC BY