| 학회 | 한국화학공학회 |
| 학술대회 | 2013년 가을 (10/23 ~ 10/25, 대구 EXCO) |
| 권호 | 19권 2호, p.1943 |
| 발표분야 | 재료 |
| 제목 | Facile Contorl of Size and Morphology for PbSe Nanocrystals via Slow Colloidal Growth |
| 초록 | Colloidal PbSe nanocrytals have been the focus of recent synthetic interest largely due to the size-tunability of their gap through the near infrared. In addition, various properties, such as carrier multiplication, carrier lifetime and et cetera, can be enhanced by the morphology of nanocrystals. However, conventional synthetic methods remain challenging to achieve these. In this research, we report finely size-tuned PbSe nanocrystals and morphologically contorolled PbSe nanosheets via simple control of reaction parameters. The approach involves slow injection of precursors with excess amounts of oleic acid. Retarded growth, due to both the slow supply of precurosrs and the surfeit of oleic acid, causes attachment of PbSe nanocrystals through the (110) planes, the most reactive planes, into a two-dimensional geometry. In contrast, such attachment process can be prevented by impurities, e.g., Cd chalcogenide (CdSe or CdS) nanocystals dispersed in chloroform, resulting in the growth of monodisperse PbSe nanocrystals. |
| 저자 | 이석원, 이도창 |
| 소속 | KAIST |
| 키워드 | PbSe nanosheets; Slow injection; Oleic acid; Morphology control; Slow nanocrystal growth |
| 원문파일 | 초록 보기 |
