Flower-like silver nanocrystals: facile synthesis via a gas–solution interface technique
- 187 Downloads
In this paper, flower-like Ag nanocrystals and their fractal networks were successfully synthesized by gas–solution interface technique at the surface of AgNO3 water solution with the assistance of ammonium citrate and of gaseous N2H4 used as reductant. The synthesized flower-like silver structure consisted of a large number of petal-like silver nanoplates. They were characterized by scanning and transmission electron microscopy, absorption UV–Vis spectroscopy, and X-ray diffraction. In addition to the standard silver fcc modification, the nanostructures contained the hexagonal polymorph (4H-Ag) in the amount of about 5%. The effect of pH of the solution on the morphology of nanoparticles and on the silver crystal structure was examined. Depending on the time of treatment with gaseous hydrazine, it was possible to obtain either separate flower-like nanoparicles and their fractal networks, or continuous films formed by rather closely packed petal-like nanoparticles. The surface-enhanced Raman scattering effect was observed, and the most intense interaction of laser beam with the silver nanoparticles occurred when the solution side of the synthesized film was irradiated.
The study was supported by Russian Foundation for Basic Research (Grant 15-03-08045). The XRD measurements were done at the Resource Centre for X-ray diffraction studies, SPbSU. The SEM, TEM and HRTEM studies were performed at the Nanotechnology Centre, SPbSU. The SERS study was carried out at the Resource Centre for Optical and Laser Materials Research, SPbSU. The authors are thankful to V. Mikhailovskii, D. Danilov, and A. Kireev, St. Petersburg State University, for their helpful assistance in the Ag nanostructure characterization.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 21.Korotcenkov G, Cho BK, Gulina LB, Tolstoy VP (2011) Gas sensing properties of SnO2 thin films modified by Ag nanoclusters synthesized by SILD method. World Acad Sci Eng Technol 81:199–202Google Scholar
- 29.Gulina LB, Tolstoy VP (2011) Micro- and nanotubules of As2S3 and AgAsS2 synthesized in “soft” chemistry condition. In: Vyvenko OF (ed) State-of-the-art trends of scientific researches of artificial and natural nanoobjects. Saint-Petersburg State University, Saint-Petersburg, p 91Google Scholar
- 35.Gulina LB, Tolstoy VP, Lobinskiy AA, Petrov YV (2016) The interaction of gaseous SiF4 and HF with surface of aqueous solution of LaCl3 Leading to the formation of the LaF3–SiO2·nH2O nanocomposite and microtubes on its basis. Russ J Gen Chem 86(12):2057–2060. https://doi.org/10.1134/S1070363216120197 CrossRefGoogle Scholar
- 36.Tolstoy VP, Gulina LB (2013) New way of As2S3 microtubules preparation by roll up thin films synthesized at the air–solution interface. J Nano-Electron Phys 5(1):01003Google Scholar
- 47.Stiles PL, Dieringer JA, Shah NC, Van Duyne RP (2008) Surface-enhanced Raman spectroscopy. Annu Rev Anal Chem 1:601–626. https://doi.org/10.1146/annurev.anchem.1.031207.112814 CrossRefGoogle Scholar
- 52.Ato ID. Silver substrate “Randa S”. Overview. http://atoid.com/shop/serssilvers.html. Accessed 20 Feb 2018
- 53.EnSpectr SERS Substrates. http://enspectr.com/2016/02/19/sers-substates. Accessed 20 Feb 2018