Synthesis of mesoporous-silica coated multi-branched gold nanoparticles for surface enhanced Raman scattering evaluation of 4-bromomethcathinone |
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Authors: | Yun Zou Hong Chen Yu Li Xiaoliang Yuan Xuejun Zhao Wei Chen Fangqi Cao Nengbin Cai Xiaochun Huang Feiyu Yang Wenbin Liu |
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Institution: | 1. Shanghai Key Laboratory of Crime Scene Evidence, Shanghai Research Institute of Criminal Science and Technology, 803 Zhongshan North 1st Road, Shanghai 200083, PR China;2. Shanghai Key Laboratory of Crime Science Evidence, Institute of Forensic Science, Shanghai Public Security Bureau, 803 Zhongshan North 1st Road, Shanghai 200083, PR China |
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Abstract: | Mesoporous silica-coated multi-branched gold nanoparticles (bAu@mesoSiO2) aiming for enhanced Raman sensing for 4-bromomethcathinone (4-BMC) detection is reported. In this work, we present an effective strategy to probe the Raman signal of 4-MBC. Morphologies and optical properties of the synthesized materials with different Au3+]/Au0] ratios are characterized utilizing transmission electron microscopy (TEM), UV–vis and mid-infrared spectroscopy. Both experimental and theoretical (simulation) studies were investigated. Taking advantages of gold core branches that provide highly localized and strongly enhanced electromagnetic fields due to plasmon resonance, surface-enhanced Raman scattering (SERS) is observed. The experimental results show that the SERS intensity exhibits a 100-fold increase with the increased average length and quantity of gold branches (nano tips). The analytical performance yielded a detection limit of 0.1?mg/ml for the 4-MBC target within 5?mins. The sensing method will likely find further improvement and broad use in the forensic science. Besides rapid detection and portability, the combination of the Raman effect and enhanced materials imparts other notable advantages, such as its non-contact and free of reagents. |
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Keywords: | Multi-branched gold nanoparticles SERS Spectroscopy 4-Bromomethcathinone Rapid detection |
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