Structure-Controlled Solventless Thermolytic Synthesis of Uniform Silver Nanodisks

Abstract

Monodisperse silver nanodisks are synthesized on the gram scale from a well-characterized layered silver thiolate precursor via thermolysis at 180-225 degrees C under a N(2) atmosphere. XRD, TEM, HRTEM, and AFM analyses indicate that the nanodisks generated at 180 degrees C over 2 h have an average diameter of about 16.1 nm (sigma = +/-12%) and a thickness of 2.3 nm (sigma = +/-14%), and they lie on their (111) faces. The disk shape is considered to be predestined by the crystal structure of the precursor. Important aspects regarding the stability of the precursor, the thermolysis temperature, and the annealing time, as well as a possible conversion mechanism, are discussed.

Nanostructured Materials Preparation via Condensation Ways

“…Thermolysis of zinc, cadmium and nickel dodecanethiolates at 573 K with coordinating trioctylphosphine oxide as the solvent or without a solvent afforded ZnS and CdS nanocrystals with nanoparticle size of 1.5-3.0 nm coated by solvent molecules [413,414] and NiS nanoparticles shaped as plates and rods [415]. Particles with similar size are formed in the thermolysis of AgSC 12 H 25 Àn [416] while in the case of Bi(SC 12 H 25 Àn) 3 , either layered nanostructures [417] or spheres and hexagonal plates are formed [418] as well as Ag(I), Cu(I) and Pb (II) alkanoates [419]. Thermolysis of copper dodecanethiolate in an inert atmosphere in the absence of solvent at 470-490 K results in the formation of CuS nanoparticles of diameter~3 nm and 12.7 nm-thick faceted nanodiscs of diameter 27.5 nm formed as a result of crystallization processes [420].…”

Flower Shaped Silver Nanostructures: An Efficient Bacteria Exterminator

“…However, more emphasis has been paid for different shaped Ag nanostructures. Various synthetic protocols have been documented for the production of silver nanoparticles with different shapes Xia, 2002a, 2002b ;Jin et al, 2001;Lofton and Singmund, 2005;Pastoriza-Santos and Liz-marjan, 2002;Bera and Raj, 2010;Nicewarner-Pena et al 2001;Kim et al 2004;Yu and Yam, 2004;Im et al 2005;Hao et al 2002;Chen et al 2005Jiang et al 2006;Ducamp-Sanuesa et al 1992;Xue et al 2008). Xia and co-workers adopted the polyol process to synthesize a variety of different shaped Ag nanostructures by controlling the concentration of capping agent PVP and precursor, Ag NO 3 in solution (Wiley et al 2006(Wiley et al , 2004Sun et al, 2003).…”

Using a precursor in lamellar structure for the synthesis of uniform ZnS nanocrystals

“…In the latter case, products may exhibit similarity in morphologies or structures as that of the precursors [11]. In the surfactant-free synthesis, the precursors can serve not only as the starting materials but also as templates for the preparation of uniform nanomaterials [11][12][13][14][15]. To understand the impact of the precursor on the final products, many possible mechanisms have been discussed in the literature.…”

“…To understand the impact of the precursor on the final products, many possible mechanisms have been discussed in the literature. For example, Chen suggested a mechanism for structure-controlled solventless thermolysis synthesis of nanostructures [13][14][15]. However, there is still lacking an understanding of the precursor structure-controlled transformation mechanism, and more research work in this field is required to understand the mechanism of the controlled synthesis of nanomaterials with desired size and morphology.…”