High Quality CdHgTe Nanocrystals with Strong Near-Infrared Emission: Relationship between Composition and Cytotoxic Effects

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• 作者：Wenjing Cai ; Liming Jiang ; Dongmei Yi ; Haizhu Sun ; Haotong Wei ; Hao Zhang ; Hongchen Sun ; Bai Yang
• 刊名：Langmuir
• 出版年：2013
• 出版时间：March 26, 2013
• 年：2013
• 卷：29
• 期：12
• 页码：4119-4127
• 全文大小：573K
• 年卷期：v.29,no.12(March 26, 2013)
• ISSN：1520-5827

文摘

High quality CdHgTe quasi core/shell nanocrystals (NCs) were prepared via the one-step method. The relationship between the composition, structure, and property was systematically investigated by the combination of X-ray photoelectron spectroscopy (XPS), inductively coupled plasma atomic emission (ICP), and the photoluminescence (PL) measurements. The quantum yield (QY) was 50% when the feed ratio of Cd²⁺ to Hg²⁺ was equal to 1. The PL property was further polished, and the QY was improved to 80% through the variance of the prepared conditions such as the ratio of ligand to metal ion and HTe^{鈥?/sup> to metal ion, pH value, and temperature. In addition, the cytotoxic effects of CdHgTe NCs were systematically studied. The results showed that, for Cd_0.21Hg_0.79Te NCs, its quasi core/shell structure was very stable and little cadmium ions were released. As a result, such NCs showed little cytotoxicity and would find applications in tissue imaging or detection.}