In situ Encapsulation of Pt Nanoarchitectures of Varying Morphologies in Mesoporous Compounds

Abstract

Nanoparticle morphology could be engineered and fine-tuned based on a novel in situ template method. Different shapes of platinum nanoparticles were obtained from very low concentrations of precursors and could be isolated exclusively inside the mesochannels of SBA-15. This was achieved by dispersing a platinum precursor in surfactant modified polymer to different extents and using these composite materials as templates for the formation of mesoporous silica. [PtCl 6 ] 2-interacts with the cationic headgroup of the surfactant and facilitates the isolation of precursors within the composite template leading to the formation of nanoparticles molded by the walls of the mesochannels when calcined. When this [PtCl 6 ] 2--surfactant-polymer micelle composite is aged for different durations, Pt nanoparticles of various morphologies like spheroids, nano rugby balls, and nanorods are obtained.

Size Dependence of Crystal Structure and Magnetic Properties of NiO Nanoparticles in Mesoporous Silica

“…The nanoparticle with d = 3.7 nm shown in the TEM image is approximately spherical whereas that with d = 12.2 nm is spheroidal because the nanoparticles were synthesized in one-dimensional pores with diameters of approximately 7 nm, so that the sizes of some particles were larger than the pore size. 26 The powder XRD patterns for NiO nanoparticles in SBA-15 pores were obtained at room temperature. Figure 2 shows an example powder XRD pattern for five different samples of NiO nanoparticles in SBA-15, for which the sizes were estimated to be d = 2.6, 2.9, 4.3, 8.6, and 17.2 nm, as explained below.…”

Functionalization methods of SBA-15 mesoporous molecular sieve: a brief overview

“…Chi et al [92] report novel method to fabricated Ag/SBA-15 with well dispersed silver nanoparticles inside the mesoporous channels silica, using incipient wetness impregnation method, toluene as fill agent, Ag(NH 3 ) 2 NO 3 solution as source of silver and glucose how mild reducing agent. Prashar et al [93] obtained PtSBA-15 with nanoparticles of Pt inside mesoporous channels of SBA-15 using novel in situ template method which was similar to the direct synthesis method adding CTAB surfactant on the synthesis gel.…”

Evolution from small sized Au nanoparticles to hollow Pt/Au nanostructures with Pt nanorods and a mechanistic study

“…Thus, developing methods to fabricate Pt NPs with various shapes is a very important issue. So far, many routes, including seeding growth, [9][10][11][12][13][14][15] the introduction of inorganic ions, 16,17 decomposition of organic Pt precursors under high temperature, [18][19][20][21][22][23][24][25][26][27][28][29] template-induced growth, 16,17 galvanic reaction, [35][36][37] and electrochemical methods 38,39 have been developed to prepare Pt NPs with various shapes including polyhedron, 3 nanowire, 31 nanorod, 30 branched structure, 18 multipod 23 and dendrite [40][41][42][43][44][45] successfully. Among them, rod-like nanostructures attract much attention.…”