NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2017, 8 (5), P. 628–634
Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles
A.Yu. Polyakov – Department of Materials Science, Lomonosov Moscow State University, 1-73 Leninskiye gory, Moscow, 119991, Russia; a.yu.polyakov@gmail.com
V. A. Lebedev – Department of Materials Science, Lomonosov Moscow State University, 1-73 Leninskiye gory, Moscow, 119991, Russia
L. Yadgarov – Tel Aviv University, P. O. Box 39040, Tel Aviv 6997801, Israel
E. A. Goodilin – Department of Materials Science, Lomonosov Moscow State University, 1-73 Leninskiye gory, Moscow, 119991, Russia; goodilin@gmail.com
Silver-coated WS2 nanotubes (NT-WS2) were successfully synthesized via two wet chemistry techniques. The first employs spontaneous silver nanoparticle growth resulting from an interaction of disulfide nanotubes with AgNO3 in aqueous suspensions at 100 °C without any additional reducing agents or stabilizers. The second utilizes [Ag(NH3)2]OH complex to produce silver nanoparticles upon thermal decomposition. Both techniques are capable of producing Ag-NT-WS2 nanocomposites containing 5–60 nm silver nanoparticles tightly attached to the nanotubes’ surfaces. The hexagonal arrangement of sulfur atoms of the outer WS2 layer was postulated to facilitate crystallization of silver nanocrystals with hexagonal crystallographic system (4H–Ag). The physical-chemical model for spontaneous AgNP formation is proposed.
Keywords: WS2 nanotubes, silver nanoparticles, plasmonic nanoparticles, nanocomposite, spontaneous growth, 4H silver.
PACS 81.10.-h, 88.30.mj
DOI 10.17586/2220-8054-2017-8-5-628-634