Silver Chlorobromide Nanocubes: A Class of Reactive Templates for Synthesizing Nanoplates and Nanocages of Silver Thiola
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.219
Silver Chlorobromide Nanocubes: A Class of Reactive Templates for Synthesizing Nanoplates and Nanocages of Silver Thiolates Sasitha C. Abeyweera and Yugang Sun* Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA 19122, U.S.A. *Corresponding author. Email: [email protected]
ABSTRACT
Uniform silver chlorobromide nanocubes have been used to regulate the availability of an extremely low concentration of Ag+ that react with different thiol molecules to form silver thiolate nanoplates with high controllability. The sacrificial silver chlorobromide nanocubes also serve as templates to provide surface nucleation sites for forming the silver thiolate nanoplates, which grow against the surfaces of the nanocubes to organize into nanocages upon the consumption of the entire nanocubes. The precise regulation of the extremely low concentration of Ag+ prevents the uncontrolled fast reaction with thiol molecules and the formation of irregular silver thiolate particles. This method represents a versatile strategy to control the reaction rate of fast reactions involving in the synthesis of colloidal nanoparticles, thus enabling the synthesis of uniform nanoparticles with desirable parameters.
INTRODUCTION Two-dimensional (2D) metal-organic complex (MOC) nanostructures have recently attracted much interest due to their promising electronic and optical properties [1–3]. Different from the widely studied 2D materials including graphene [4–6], metal dichalcogenides [7–9], boron nitrides [10] and MXenes [11,12], compositions of MOCs can be easily tuned by using different organic molecules. The well-known selfassembled monolayers (SAMs) of thiols on silver (Ag) and gold (Au) metal surfaces represent a class of pseudo-MOC layers supported on the metals [13]. The size of the pseudo-MOC layers can be decreased to the nanometer scale by forming the SAMs of thiol molecules on the surfaces of Ag nanoparticles [14,15]. The stoichiometric silver thiolate (AgSR) compounds were first reported by Dance and coworkers [16,17], which
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become attractive because of their intriguing properties and applications [1,18,19]. Either the solution-phase reactions or the physical deposition methods are suitable for synthesizing AgSR. The solution-phase reactions involve the direct mixing of metal salts and thiols followed by the precipitation reactions. The geometry and dimensions of the resulting particles are usually difficult to control [14,20]. A physical deposition involves a thermal deposition of ultra-small Ag islands followed by reacting them with thiol vapor. The physical deposition usually requires an extreme reaction environment and a specialized reactor, hindering its full applications [21,22]. Despit
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