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合 Cu-Doped ZnS 纳米晶体的快速T型光色化

Yulian Han¹, Morihiko Hamada², I-Ya Chang³

¹Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan.

Journal of the American Chemical Society

|January 12, 2021

概括

用铜添加的硫化 (ZnS) 纳米晶体具有耐用性,独立于温度的光色. 这些纳米材料提供快速,可逆的颜色变化,

科学领域:

材料科学
纳米技术
摄影化学

背景情况:

光色材料在曝光时可逆地改变颜色.
传统的无机光色材料往往有缓慢的反应时间和有限的耐用性.
开发具有增强性能的新型光色材料对于技术进步至关重要.

研究的目的:

对硫化物 (ZnS) 纳米晶体 (NCs) 的T型光色学研究.
了解可逆光感应变色和变色过程背后的机制.
评估这些NC在各种光色应用中的潜力.

主要方法:

使用水介导的单方法合成合体Cu-doped ZnS NCs.
光色属性的表征,包括颜色变化动力学和温度依赖 (298-328 K).
使用光学光谱和载体动力学分析对底层机制的研究.

主要成果:

在298-328K之间,Cu-doped ZnS NC表现出持久且几乎独立于温度的光色.
紫外线辐射导致从淡黄色变为深灰色的可逆变色.
粉末形式的变色时间为几秒到几分钟,溶液中的变色时间比传统材料快得多.
该机制涉及通过电子跳跃解离的内部载体重组幸存的移位表面孔.

结论:

化ZnSNC具有独特,快速和持久的光色特性.
观察到的光色是由于特定的激发载体动力学和陷深度.
这些NC对智能窗户和建筑材料以及其他光功能纳米材料等大规模应用具有前景.

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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.