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| Content Provider | frontiers |
|---|---|
| Author | Mi, Xiaohu Zhang, Tingting Zhang, Baobao Ji, Min Kang, Bowen Kang, Chao Fu, Zhengkun Zhang, Zhenglong Zheng, Hairong |
| Description | Plasmonic nanostructures with sharp tips are widely used for optical signal enhancement because of their strong light-confining abilities. These structures have a wide range of potential applications, for example, in sensing, bioimaging, and surface-enhanced Raman scattering. Au nanoparticles, which are important plasmonic materials with high photothermal conversion efficiencies in the visible to near-infrared region, have contributed greatly to the development of photothermal catalysis. However, the existing methods for synthesizing nanostructures with tips need the assistance of poly(vinylpyrrolidone), thiols, or biomolecules. This greatly hinders signal detection because of stubborn residues. Here, we propose an efficient binary surfactant–mediated method for controlling nanotip growth on Au nanoparticle surfaces. This avoids the effects of surfactants and can be used with other Au nanostructures. The Au architecture tip growth process can be controlled well by adjusting the ratio of hexadecyltrimethylammonium bromide to hexadecyltrimethylammonium chloride. This is due to the different levels of attraction between Br−/Cl− and Au3+ ions. The surface-enhanced Raman scattering and catalytic abilities of the synthesized nanoparticles with tips were evaluated by electromagnetic simulation and photothermal catalysis experiments (with 4-nitrothiophenol). The results show good potential for use in surface-enhanced Raman scattering applications. This method provides a new strate... |
| Abstract | The plasmonic nanostructures with sharp tips have been widely used for optical signal enhancement due to the strong light confinement ability, which have been widely used for sensing, bioimaging and SERE technique. Gold nanoparticles exhibit a great photothermal conversion efficiency in visible to near infrared region due to the strong light absorption ability, which has largely contributed to the application of photothermal catalysis. The existing method of synthesizing the nanostructures with tips, however, always need the assistance of PVP, thiol compounds and biomolecules, which highly hinders the detected signal due to the stubborn residues. Herein, we proposed an efficient method mediated by binary surfactants to control the nanotips growth on arbitrary surface of the gold nanoparticles, which not only can exclude the influence from surfactants, but also can used for any arbitrary shape of the Au nanostructures. The tip growth process of the Au architectures can be well controlled by the adjusting the ratio of CTAB and CTAC resulting from the contribution of the different attraction ability between Br-/Cl- and Au3+ ions. Furthermore, the SERS and catalytic ability of the synthesized nanoparticles with tips have been evaluated by both electromagnetic simulation and photothermal catalysis experiment (p-nitrobenzenethiol), which shows a grate application potential in SERE technique. This method provides a new strategy for designing plasmonic photothermal nanostructures for the applications of chemical and biological applications. |
| ISSN | 22962646 |
| DOI | 10.3389/fchem.2021.699548 |
| Volume Number | 9 |
| Journal | Frontiers in Chemistry |
| Language | English |
| Publisher Date | 2021-07-07 |
| Access Restriction | Open |
| Subject Keyword | Photothermal effect Nanotip growth Binary Surfactants Surface Plasmon Resonance SERS |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry |
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