Characterization of Labeled Gold Nanoparticles for Surface-Enhanced Raman Scattering.

Characterization of Labeled Gold Nanoparticles for Surface-Enhanced Raman Scattering.
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DOI:
10.3390/molecules27030892
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发表时间:
2022-01-28
期刊:
Molecules (Basel, Switzerland)
影响因子:
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通讯作者:
Aldosari FMM
Aldosari FMM
中科院分区:
其他
文献类型:
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作者:
Aldosari FMM

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贵金属纳米颗粒(NP)如金(AuNP)和银纳米颗粒(AgNP)由于它们的等离子体特性而可以产生超灵敏的表面增强拉曼散射(Sers)信号。金纳米粒子的生物相容性和潜在的临床诊断和治疗或组合治疗诊断学已被广泛研究。在这项工作中,标记的金纳米粒子在悬浮液中的局部表面等离子体共振(LSPR),动态光散射(DLS),和Sers活性的大小依赖性方面的特点。该研究使用一组四种拉曼标记物或报告物进行,即,具有大散射截面和用于化学吸附在AuNP上的硫醇部分的小分子,即4-巯基苯甲酸(4-MBA)、2-萘乙撑(2-NT)、4-乙酰氨基苯硫酚(4-AATP)和联苯-4-硫醇(BPT),以研究它们用于在5 nm至100 nm范围内的不同尺寸的球形AuNP的Sers标记的可行性。结果表明,在785 nm激光激发下,当纳米金颗粒尺寸达到60或80 nm时,Sers信号随纳米金颗粒尺寸的增大而增强。BPT标记的80 nm AuNP的信号最高,随后是4-AATP标记的60 nm AuNP,使得BPT和4-AATP成为直径在5 nm至100 nm范围内的球形金的拉曼标记的优选候选物。
Noble metal nanoparticles (NP) such as gold (AuNPs) and silver nanoparticles (AgNPs) can produce ultrasensitive surface-enhanced Raman scattering (SERS) signals owing to their plasmonic properties. AuNPs have been widely investigated for their biocompatibility and potential to be used in clinical diagnostics and therapeutics or combined for theranostics. In this work, labeled AuNPs in suspension were characterized in terms of size dependency of their localized surface plasmon resonance (LSPR), dynamic light scattering (DLS), and SERS activity. The study was conducted using a set of four Raman labels or reporters, i.e., small molecules with large scattering cross-section and a thiol moiety for chemisorption on the AuNP, namely 4-mercaptobenzoic acid (4-MBA), 2-naphthalenethiol (2-NT), 4-acetamidothiophenol (4-AATP), and biphenyl-4-thiol (BPT), to investigate their viability for SERS tagging of spherical AuNPs of different size in the range 5 nm to 100 nm. The results showed that, when using 785 nm laser excitation, the SERS signal increases with the increasing size of AuNP up to 60 or 80 nm. The signal is highest for BPT labelled 80 nm AuNPs followed by 4-AATP labeled 60 nm AuNPs, making BPT and 4-AATP the preferred candidates for Raman labelling of spherical gold within the range of 5 nm to 100 nm in diameter.
用于三重三维细胞成像的组合标记和无标记 SERS 探针
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