金属有机框架作为表面增强的拉曼散射基质,具有高可定制性
Hongzhao Sun1,2, Shan Cong1,3, Zuhui Zheng1
1Key Lab of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS) , Suzhou 215123 , China.
Journal of the American Chemical Society
|December 20, 2018
概括
金属有机框架 (MOF) 为选择性分子检测提供高度可定制的表面增强拉曼散射 (SERS) 基板. 这些基于MOF的SERS基板可以实现高增强系数和低检测极限,而不需要特殊的预处理.
科学领域:
- 材料科学
- 分析化学
- 纳米技术
背景情况:
- 表面增强拉曼散射 (SERS) 是一种敏感的分析技术,依赖于专门的基板来检测微量分子.
- 传统的SERS基板,包括贵金属和半导体,在实现高可定制性和选择性方面存在挑战.
- 开发具有可调节性质的新型SERS基板对于推进分子检测能力至关重要.
研究的目的:
- 探索金属有机框架 (MOF) 作为具有固有的分子选择性的新型SERS基质.
- 通过合理设计来证明基于MOF的SERS基板适合特定的分析物检测的能力.
- 使用MOF材料实现高SERS增强系数和低检测极限.
主要方法:
- 合成的MOF材料具有受控的金属中心,有机配体和框架拓.
- 操纵基于MOF的SERS基板的电子带结构以匹配目标分析物.
- 优化了MOF的孔隙结构和表面修改,以提高SERS的性能.
- 研究了选择性SERS增强的潜在机制,包括电荷转移和共振相互作用.
主要成果:
- 已证明MOF材料是有效的SERS基质,具有分子选择性,这是常规基质中罕见的特征.
- 达到高达10^6的显著SERS增强系数 (EF),与贵金属相比.
- 通过孔隙结构优化和表面修改达到10-8M的低检测极限.
- 展示了电荷转移,带间和分子共振的选择性增强.
结论:
- 基于MOF的材料代表了一类新的高度可设计的SERS基材.
- MOF的可定制性使得基板电子特性与选择性检测分析物的精确匹配成为可能.
- 这项工作为开发各种分析应用的灵活和选择性的SERS基材开辟了新的途径.
更多相关视频
11:44Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
21.2K
06:45Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
Published on: March 8, 2024
9.9K
相关概念视频
02:32Bonding in Metals
52.4K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.4K
02:37Metallic Solids
20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K
03:06Alkali Metals
24.6K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.6K
02:51Metal-Ligand Bonds
24.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.3K
02:58Properties of Transition Metals
29.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.8K
01:15Scatter Plot
11.3K
The most common and easiest way to display the relationship between two variables, x and y, is a scatter plot. A scatter plot shows the direction of a relationship between the variables. A clear direction happens when there is either:
11.3K