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基于金属冠的可调光学分子温度计

Elvin V Salerno¹, Albano N Carneiro Neto², Svetlana V Eliseeva³

¹Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States.

Journal of the American Chemical Society

|September 29, 2022

概括

研究人员开发了新的分子纳米热量计,研究了连接体能量水平如何影响化物排放. 他们发现特定的能量差距控制了热依赖, 使得敏感的温度测量成为可能.

科学领域:

协调化学
材料科学
纳米技术

背景情况:

由于其尖的排放线,兰化物复合物对光学温度测量具有前景.
控制化物排放的热依赖对于开发精确的分子温度计至关重要.
连接体能量水平在兰化物复合体内的能量转移过程中起着重要作用.

研究的目的:

调查连体能量水平对化物排放的热行为的影响.
为潜在的纳米温度计应用合成和描述基于化物的新型金属冠.
建立结构-属性关系,控制兰坦化物发光的热灵敏度.

主要方法:

合成和表征Ln₂Ga₈L_{8'L_{8"金属冠使用各种兰坦化物 (Gd³⁺,Tb³⁺,Sm³⁺) 和酸联体.}}
谱分析以确定以连体为中心的单体 (S₁) 和三体 (T₁) 能量水平.
在温度范围内 (150-350K) 评估化物排放强度和量子产量的热依赖性.

主要成果:

连接体三重体状态 (T₁) 和激发的兰化物状态 (Sm³⁺ ⁴ G_5/2,Tb³⁺ ⁵ D₄) 之间的能量差异通过反向能量转移显著控制热发射依赖性.
小的S₁-T₁能量差距 (<3760 cm^-1) 引入了影响热行为的系统间交叉机制.
一个混合Tb₂moshi_{8'/Sm₂moshi_{8系统实现了较高的相对热敏度 (>3%/K在225K),证明了一个功能性的光学温度计.}}

结论:

连接体能量水平工程是一种可行的策略,用于调整以兰他尼德为基础的分子温度计的热敏度.
开发的金属冠显示适合各种温度传感应用的可调节的热响应.
混合不同的兰化物复合物提供了一种创建具有增强性能的多范围光学温度计的途径.

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