Size-dependent electrochemical behavior of thiol-capped CdTe nanocrystals in aqueous solution
文献类型：期刊论文
| 作者 | Poznyak, SK; Osipovich, NP; Shavel, A; Talapin, DV; Gao, MY; Eychmuller, A; Gaponik, N |
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY B
 |
| 出版日期 | 2005-01-27 |
| 卷号 | 109期号:3页码:1094-1100 |
| ISSN号 | 1520-6106 |
| DOI | 10.1021/jp0460801 |
| 英文摘要 | Electrochemical studies of thiol-capped CdTe nanocrystals in aqueous solution have demonstrated several distinct oxidation and reduction peaks in the voltammograms, with the peak positions being dependent on the size of the nanocrystals. While the size dependence of the reduction and one of the oxidation potentials can be attributed to altering the energetic band positions owing to the quantum size effect, an extraordinary behavior was found for the oxidation peak observed at less positive potentials. In contrast to a prediction based on the quantum size effect, this peak moves to more negative potentials as the nanocrystals' size decreases. Moreover, the contribution of the charae associated with this peak compared to the total charge passed during the nanocrystal oxidation correlates well with the photoluminescence (PL) efficiency of individual fractions of the CdTe nanocrystals. These experimental observations allow a peak to be assigned to the oxidation of Te-related surface traps. The intra-band-gap energy level assigned to these Te-related trap states shifts toward the top of the valence band as the nanocrystal size increases, thus allowing the higher photostability of the larger nanocrystals to be explained. At a certain nanocrystal size, the trap level can even move out of the band gap. |
| 语种 | 英语 |
| WOS记录号 | WOS:000226449800006 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/57791]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Gaponik, N |
| 作者单位 | 1.Univ Hamburg, Inst Chem Phys, D-20146 Hamburg, Germany 2.Belarussian State Univ, Physico Chem Res Inst, Minsk 220050, Byelarus 3.Chinese Acad Sci, Key Lab Colloid Interface Sci & Chem Thermodynam, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Poznyak, SK,Osipovich, NP,Shavel, A,et al. Size-dependent electrochemical behavior of thiol-capped CdTe nanocrystals in aqueous solution[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2005,109(3):1094-1100. |
| APA | Poznyak, SK.,Osipovich, NP.,Shavel, A.,Talapin, DV.,Gao, MY.,...&Gaponik, N.(2005).Size-dependent electrochemical behavior of thiol-capped CdTe nanocrystals in aqueous solution.JOURNAL OF PHYSICAL CHEMISTRY B,109(3),1094-1100. |
| MLA | Poznyak, SK,et al."Size-dependent electrochemical behavior of thiol-capped CdTe nanocrystals in aqueous solution".JOURNAL OF PHYSICAL CHEMISTRY B 109.3(2005):1094-1100. |
入库方式： OAI收割
来源：化学研究所
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