Abstract
A simple synthesis route for growth of Ag/AgO nanoparticles (NPs) in large quantitative yields with narrow size distribution from a functional, non-activated, Ni (II) based highly flexible porous coordination polymer (PCP) as a template has been demonstrated. This template is a stable storage media for the NPs larger than the pore diameters of the PCP. From EPR study it was concluded that NPs were synthesized via two mechanisms i.e. acid formation and the redox activity of the framework. Size range of Ag/AgO NPs is sensitive to choice of solvent and reaction time. Direct use of Ag/AgO@Ni-PCP shows influential growth inhibition towards Escherichia coli and the pathogen Salmonella typhimurium at extremely low concentrations. The pristine template shows no cytotoxic activity, even though it contains Ni nodes in the framework.
Highlights
A simple synthesis route for growth of Ag/AgO nanoparticles (NPs) in large quantitative yields with narrow size distribution from a functional, non-activated, Ni (II) based highly flexible porous coordination polymer (PCP) as a template has been demonstrated
Solvent accessible volume of the PCP is ~36% of the unit cell volume and Brunauer-Emmett-Teller (BET) surface area calculated from CO2 sorption at 195 K and one atmospheric pressure, is 297.63 m2 g−1
To nucleate and grow Ag/AgO NPs, the Ni-PCP was immersed in suitable solution of AgNO3 at room temperature for 48 h (See Methods) to afford a brownish fibrous host solid whose morphology is different from the pristine green coloured crystalline polymer (Supplementary Fig. S1)
Summary
A simple synthesis route for growth of Ag/AgO nanoparticles (NPs) in large quantitative yields with narrow size distribution from a functional, non-activated, Ni (II) based highly flexible porous coordination polymer (PCP) as a template has been demonstrated. Porous coordination polymers (PCPs)/metal organic frameworks (MOFs) are of research interest as they possess structural regularity, high porosity and surface area, and structural transformation ability, creating great potential in molecular adsorption and separation processes[1,2], ion exchange[3], catalysis[4,5], sensor technology[6], optoelectronics and biomedical applications[7], etc These can be either rigid or flexible. The high surface-area-to-volume ratio of NPs provides a large number of active sites, the size and shape of which control reactivity[18], whereas high surface energy and large surface area of NPs results in drastic reduction of thermodynamic stability which hinders their size, shape and degree of uniformity Nucleation includes methodologies such as chemical vapour deposition[19], solution infiltration with[20] and without photo-irradiation, solid grinding[21] and polyol mediated method[22] of synthesis for introducing metal precursors.
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