Text this: Synthesis of PbS/CdS core-shell QDs and their nonlinear optical properties

 _    _     _____    _    _     _____     ______  
| |  | ||  |  ___|| | |  | ||  |  ___||  /_____// 
| |/\| ||  | ||__   | |/\| ||  | ||__    `____ `  
|  /\  ||  | ||__   |  /\  ||  | ||__    /___//   
|_// \_||  |_____|| |_// \_||  |_____||  `__ `    
`-`   `-`  `-----`  `-`   `-`  `-----`   /_//     
                                         `-`