研究目的
Investigating the controllability of dumbbell morphology for silica-coated gold nanorods and their plasmonic properties.
研究成果
The study successfully demonstrated the controllability of dumbbell morphology for silica-coated gold nanorods by adjusting CTAB and TEOS concentrations. The dumbbell morphology showed significant SERS enhancement compared to the cylindrical morphology, with less impact on the LSPR properties. This capability to control the morphology can broaden the application of these plasmonic nanomaterials in sensing and imaging.
研究不足
The study is limited by the reaction time for silica growth on the GNRs, which affects the maximum achievable thickness of the silica shell. Additionally, the SERS enhancement factors reported are relatively low, possibly due to the signal coming from individual GNRs.
1：Experimental Design and Method Selection:
The study involved the synthesis of gold nanorods via a seed-mediated growth method followed by silica coating to achieve either cylindrical or dumbbell-shaped morphologies. The impact of CTAB and TEOS concentrations on the morphology was investigated.
2：Sample Selection and Data Sources:
Gold nanorods were synthesized and then coated with silica under varying conditions of CTAB and TEOS concentrations. The samples were characterized using STEM and UV-vis spectroscopy.
3：List of Experimental Equipment and Materials:
Hexadecyltrimethylammonium bromide (CTAB), gold(III) chloride trihydrate (HAuCl4?3H2O), L-ascorbic acid (L-AA), hydrochloric acid (HCl), tetraethylorthosilicate (TEOS), ammonium hydroxide (NH4OH), and ethanol (EtOH) were used. Equipment included a JOEL-7200F field emission SEM and a Jasco V 670 UV-Vis-NIR spectrophotometer.
4：Experimental Procedures and Operational Workflow:
Gold nanorods were synthesized, purified, and then coated with silica under controlled conditions. The morphology of the silica coating was adjusted by varying the concentrations of CTAB and TEOS.
5：Data Analysis Methods:
The morphology and size of the nanoparticles were analyzed using STEM images and ImageJ software. UV-vis spectroscopy was used to study the LSPR properties, and SERS performance was evaluated using a Raman spectrometer.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
