Study on selective oxidations of gold nanorod and mesoporous silica-coated gold nanorod
The structural control-based manipulation of the anisotropic surface plasmon resonance (SPR) property of gold nanorod (AuNR) is significant and has wide application value in many fields. In this work, the quantitative studies of the ends-selective oxidations of AuNR and silica-coated AuNR using chloroauric acid as a oxidant were carried out. Results show that when the selective oxidation extent of AuNR was denoted by the aspect ratio changing rate, a linear relationship was displayed between this rate and the added amount of the oxidant, which suggested the Au(III)-induced selective oxidation of the nanoscaled Au(0) also proceeded stoichiometrically. In addition, different structural evolutions of silica coating layer that were determined to be caused by the different stabilities of the silica structure and described as the shape-adaptive change and the rigid state were found upon proceeding of oxidation. The study also showed that the structural change of the silica coating layer only had little influences on the mesopore size and its distribution state. These results should be valuable in better understanding the surface chemistry of AuNR and benefit the SPR variation-based and the silica coating-involved applications of AuNR.
This work was financially supported by the National Natural Science Foundation of China (21573078) and BAGUI Scholar Program of Guangxi Province of China.
The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 5.González-Rubio G, Díaz-Núñez P, Rivera A, Prada A, Tardajos G, González-Izquierdo J, Bañares L, Llombart P, Macdowell LG, Alcolea Palafox M, Liz-Marzán LM, Peña-Rodríguez O, Guerrero-Martínez A (2017) Femtosecond laser reshaping yields gold nanorods with ultranarrow surface plasmon resonances. Science 358(6363):640CrossRefGoogle Scholar
- 19.Wang T-T, Chai F, Wang C-G, Li L, Liu H-Y, Zhang L-Y, Su Z-M, Liao Y (2011) Fluorescent hollow/rattle-type mesoporous Au@SiO2 nanocapsules for drug delivery and fluorescence imaging of cancer cells. J Colloid Interface Sci 358(1):109–115. https://doi.org/10.1016/j.jcis.2011.02.023 CrossRefGoogle Scholar
- 26.Liu J, Detrembleur C, De Pauw-Gillet MC, Mornet S, Jerome C, Duguet E (2015) Gold nanorods coated with mesoporous silica shell as drug delivery system for remote near infrared light-activated release and potential phototherapy. Small 11(19):2323–2332. https://doi.org/10.1002/smll.201402145 CrossRefGoogle Scholar
- 28.Liu Y, Yang M, Zhang J, Zhi X, Li C, Zhang C, Pan F, Wang K, Yang Y, Martinez de la Fuentea J, Cui D (2016) Human induced pluripotent stem cells for tumor targeted delivery of gold nanorods and enhanced photothermal therapy. ACS Nano 10(2):2375–2385. https://doi.org/10.1021/acsnano.5b07172 CrossRefGoogle Scholar
- 46.Lin M, Wang Y, Sun X, Wang W, Chen L (2015) “Elastic” property of mesoporous silica shell: for dynamic surface enhanced Raman scattering ability monitoring of growing noble metal nanostructures via a simplified spatially confined growth method. ACS Appl Mater Interfaces 7(14):7516–7525. https://doi.org/10.1021/acsami.5b01077 CrossRefGoogle Scholar
- 47.Lu J, Chang YX, Zhang NN, Wei Y, Li AJ, Tai J, Xue Y, Wang ZY, Yang Y, Zhao L, Lu ZY, Liu K (2017) Chiral plasmonic nanochains via the self-assembly of gold nanorods and helical glutathione oligomers facilitated by cetyltrimethylammonium bromide micelles. ACS Nano 11(4):3463–3475. https://doi.org/10.1021/acsnano.6b07697 CrossRefGoogle Scholar