Room-temperature syntheses of CdS nanocrystals templated by triblock copolymer in aqueous solution under air condition
✍ Scribed by Ningzhong Bao; Liming Shen; Xiaohua Lu; Kazumichi Yanagisawa; Xin Feng
- Book ID
- 104108387
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 315 KB
- Volume
- 377
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
CdS nanocrystals with size of 5.0-10.0 nm were synthesized from air-insensitive inorganic precursors of CdCl 2 Á 2.5H 2 O and Na 2 S Á 9H 2 O at room temperature in both acidic and basic aqueous solutions under air condition, using the nonionic pluronic amphiphilic triblock copolymer of P123 (H-(-OCH 2 CH 2 ) 20 [-OCH(CH 3 )-CH 2 ] 70 -(-OCH 2 CH 2 ) 20 -OH, as well as (EO) 20 -(PO) 70 -(EO) 20 ) as the template and structure-directing agent. The X-ray powder diffraction patterns index to the cubic crystal structure of sphalerite for CdS nanocrystals synthesized. UV-Vis absorption spectra indicate the obvious blue shift for the band gap of CdS nanocrystals prepared in the water-rich P123 aqueous solution.